Physics Calculators

Speed Calculator Find speed from distance and time. Force Calculator Find force from mass and acceleration (Newton's second law). Density Calculator Find density from mass and volume. Acceleration Calculator Find acceleration from change in velocity over time. Momentum Calculator Find momentum from mass and velocity. Weight (Mass to Force) Calculator Convert mass into weight (force) under gravity. Gravitational Force Calculator Find the gravitational attraction between two masses. Torque Calculator Find torque from force, lever arm and angle. Free Fall Calculator Find fall distance and speed after a time in free fall. Pressure Calculator Find pressure from force spread over an area. Newton's Second Law Calculator Relate force, mass and acceleration with F = ma. Newton's Third Law Calculator Find the equal and opposite reaction force. Net Force Calculator Add up forces along a line to find the net force. Normal Force Calculator Find the normal force on an object resting on a slope. Tension Calculator Find the tension in a rope holding or lifting a mass. Hooke's Law Calculator Find the spring force from stiffness and extension. Angle of Banking Calculator Find the ideal banking angle for a curve at a given speed. Car Crash Calculator Estimate the average impact force of a crash. Car Center of Mass Calculator Find the front-to-rear center of mass from axle weights. Pounds per Square Inch Calculator Find pressure in psi from a force and area. Reduced Mass Calculator Find the reduced mass of a two-body system. Weight on Other Planets Calculator Find your weight on another planet or the Moon. G Force Calculator Express an acceleration as a multiple of Earth's gravity. Acceleration due to Gravity Calculator Find surface gravity from a body's mass and radius.

Displacement Calculator Find displacement from initial velocity, acceleration and time. Final Velocity Calculator Find final velocity from initial velocity, acceleration and time. Projectile Motion Calculator Find range, max height and flight time of a projectile. Terminal Velocity Calculator Find an object's terminal velocity in a fluid. Stopping Distance Calculator Find total stopping distance from speed and braking. Velocity Calculator Find average velocity from displacement and time. Magnitude of Acceleration Calculator Find the magnitude of an acceleration from its components. Resultant Velocity Calculator Combine two velocity components into magnitude and direction. SUVAT Calculator Find final velocity and displacement from u, a and t. Projectile Range Calculator Find how far a projectile travels horizontally. Maximum Height Calculator (Projectile Motion) Find the peak height of a projectile. Time of Flight Calculator (Projectile Motion) Find how long a projectile stays in the air. Horizontal Projectile Motion Calculator Find the flight time and range of a horizontally launched projectile. Trajectory Calculator Find a projectile's position at a given time. Car Jump Distance Calculator Estimate how far a car jumps off a ramp. Impulse and Momentum Calculator Find impulse from force and time, or from change in momentum. Conservation of Momentum Calculator Find the final velocity after a perfectly inelastic collision. Friction Calculator Find the friction force from the coefficient and normal force. Rolling Resistance Calculator Find the rolling resistance force on a wheel. Inclined Plane Calculator Find the acceleration of an object sliding down a ramp. Quarter Mile Calculator Estimate a car's quarter-mile time and trap speed from power and weight. Ground Speed Calculator Find an aircraft's ground speed from airspeed and headwind/tailwind. Muzzle Velocity Calculator Find muzzle velocity from a projectile's kinetic energy and mass. Free Fall Velocity Calculator Find the speed of a freely falling object after a given time. Free Fall Distance Calculator Find how far an object falls in a given time. Free Fall Time Calculator Find how long an object takes to fall a given height. Reaction Time Calculator Find the distance travelled during a reaction time. Polar Moment of Inertia Calculator Find the polar moment of inertia of a round shaft. Arrow Speed Calculator Estimate arrow speed from bow IBO rating and setup. Ballistic Coefficient Calculator Find a projectile's ballistic coefficient. Free Fall with Air Resistance Calculator Find falling speed and distance accounting for air resistance. MOA Calculator (Minute of Angle) Find the size a minute of angle covers at a distance. Sled Ride Calculator Find a sled's acceleration and speed down a snowy slope.

Angular Velocity Calculator Convert RPM to angular and linear velocity. Centripetal Force Calculator Find the inward force keeping an object in circular motion. Centrifugal Force Calculator Find the apparent outward force in circular motion. Centripetal Acceleration Calculator Find the inward acceleration in circular motion. Simple Pendulum Calculator Find a pendulum's period and frequency from its length. Frequency Calculator Convert between period, frequency and angular frequency. Angular Acceleration Calculator Find angular acceleration from the change in angular velocity over time. Angular Displacement Calculator Find the angle rotated from angular velocity, acceleration and time. Angular Frequency Calculator Convert frequency to angular frequency. Angular Momentum Calculator Find angular momentum from moment of inertia and angular velocity. Circular Motion Calculator Find linear speed and centripetal acceleration for circular motion. Coriolis Effect Calculator Find the Coriolis force on a moving mass in a rotating frame. Damping Ratio Calculator Find the damping ratio of a spring-mass-damper system. Flywheel Energy Storage Calculator Find the rotational energy stored in a flywheel. Harmonic Wave Equation Calculator Evaluate y = A·sin(kx − ωt) for a travelling wave. Simple Harmonic Motion Calculator Find the position of an oscillator at a given time. Rotational Kinetic Energy Calculator Find the kinetic energy of a rotating object. Rotational Stiffness Calculator Find rotational stiffness from torque and angular deflection. Physical Pendulum Calculator Find the swing period of a physical (rigid) pendulum. Kinetic Energy of a Pendulum Calculator Find a pendulum's speed and kinetic energy at the bottom of its swing. Mass Moment of Inertia Calculator Find the mass moment of inertia for common shapes. Pendulum Period Calculator Find the swing period of a simple pendulum. Pendulum Frequency Calculator Find the oscillation frequency of a simple pendulum. Centrifuge Calculator Convert centrifuge RPM to relative centrifugal force (RCF).

Kinetic Energy Calculator Find the kinetic energy of a moving object. Potential Energy Calculator Find gravitational potential energy from mass and height. Work Calculator Find work done by a force over a distance. Power Calculator Find power from work done over time. Wavelength Calculator Find wavelength from wave speed and frequency. Elastic Potential Energy Calculator Find the energy stored in a stretched/compressed spring. Efficiency Calculator Find efficiency from useful output and total input. Power-to-Weight Ratio Calculator Find power-to-weight ratio. Bullet Energy Calculator Find a bullet's kinetic energy from its mass and speed. FPE Calculator (Foot-pounds of Energy) Find muzzle energy in foot-pounds from grains and feet per second. Impact Energy Calculator Find the energy of a falling object at impact. Recoil Energy Calculator Estimate firearm recoil velocity and energy. TNT Equivalent Calculator Convert an energy in joules to an equivalent mass of TNT. Work and Power Calculator Find the work done and the power from force, distance and time. Watt Converter Convert between watts, horsepower and kilowatts. EIRP Calculator (Effective Isotropic Radiated Power) Find EIRP from transmitter power, antenna gain and losses. Signal-to-Noise Ratio Calculator Find the signal-to-noise ratio in decibels. Blast Radius Calculator Estimate the blast radius for a given explosive yield.

Speed of Sound Calculator Find the speed of sound in air at a temperature. Doppler Effect Calculator Find the observed frequency from relative motion. Decibel Calculator Convert sound intensity to decibels. Beat Frequency Calculator Find the beat frequency of two tones. Wave Speed Calculator Find wave speed from wavelength and frequency. Acoustic Impedance Calculator Find acoustic impedance from medium density and sound speed. Alfvén Velocity Calculator Find the Alfvén wave speed in a magnetized plasma. Critical Damping Calculator Find the critical damping coefficient of an oscillator. dB Gain Calculator Find gain in decibels from input and output power. Distance Attenuation Calculator Find how much a sound level drops with distance. Helmholtz Resonator Calculator Find the resonant frequency of a Helmholtz resonator. Reverberation Time Calculator Find a room's RT60 reverberation time (Sabine formula). Sound Absorption Coefficient Calculator Find the absorption coefficient from absorbed and incident energy. Sound Wavelength Calculator Find the wavelength of a sound from its frequency. Speed of Sound in Solids Calculator Find the speed of sound in a solid from its modulus and density. Inverse Square Law Calculator Find how intensity changes with distance. Attenuation Calculator Find transmitted intensity after passing through a material. Modulation Calculator Find the AM modulation index. Wavenumber Calculator Find the wavenumber of a wave from its wavelength.

Snell's Law Calculator Find the refraction angle as light enters a new medium. Thin Lens Equation Calculator Find image distance from object distance and focal length. Mirror Equation Calculator Find image distance for a curved mirror. Magnification Calculator Find magnification from image and object distances. Index of Refraction Calculator Find a medium's refractive index from light speed. Lens Power Calculator Find lens power in diopters from focal length. Angular Resolution Calculator Find the smallest angle a lens or telescope can resolve. Aperture Area Calculator Find the light-gathering area of a circular aperture. Brewster's Angle Calculator Find the angle at which reflected light is fully polarized. Malus Law Calculator Find the intensity of polarized light through a polarizer. Bragg's Law Calculator Find the diffraction angle for X-rays in a crystal. Diffraction Grating Calculator Find the diffraction angle from a grating. Lens Maker Equation Calculator Find a lens's focal length from its radii and refractive index. Diopter Calculator Convert focal length to lens power in diopters. Contact Lens Vertex Calculator Convert a spectacle prescription to a contact lens power. Distance to Horizon Calculator Find how far away the horizon is from a given height. Earth Curvature Calculator Find how much the Earth's surface drops over a distance. Radar Horizon Calculator Find the radar horizon distance accounting for atmospheric bending. Speed of Light Calculator Find the time for light to travel a given distance. Telescope Magnification Calculator Find a telescope's magnification from its focal lengths. Telescope Field of View Calculator Find the true field of view through a telescope. Laser Beam Divergence Calculator Find a laser's divergence angle from beam growth over distance. Laser Beam Expander Calculator Find the output beam size and divergence after a beam expander. Optical Density Calculator Find optical density (absorbance) from transmittance. Lumen Calculator (Lumen to Lux to Candela) Convert luminous flux to illuminance over an area. Lux to Foot Candles Converter Convert illuminance between lux and foot-candles. Thin-Film Optical Coating Calculator Find the anti-reflection coating thickness for a wavelength. Blackbody Radiation Calculator Find radiated power per area from temperature (Stefan–Boltzmann). Binoculars Range Calculator Estimate distance to an object using mil reticle ranging. Laser Linewidth and Bandwidth Calculator Convert a laser's wavelength linewidth to frequency bandwidth. Laser Beam Spot Size Calculator Find a laser beam's diameter at a distance. Hair Diffraction Calculator Find a hair's thickness from its diffraction pattern. Smartphone Projector Calculator Find the magnification of a DIY lens projector.

Ohm's Law Calculator Find current and power from voltage and resistance. Electrical Power Calculator Find electrical power and resistance from voltage and current. Resistors in Series Calculator Find total resistance of resistors in series. Resistors in Parallel Calculator Find total resistance of resistors in parallel. Capacitors in Series Calculator Find total capacitance of capacitors in series. Capacitors in Parallel Calculator Find total capacitance of capacitors in parallel. Voltage Divider Calculator Find the output voltage of a two-resistor divider. LED Resistor Calculator Find the series resistor for an LED. Capacitor Energy Calculator Find the energy stored in a capacitor. Coulomb's Law Calculator Find the electric force between two charges. Power Dissipation Calculator Find power dissipated in a resistor. Electric Field Calculator Find the electric field from a point charge. Electric Potential Calculator Find the electric potential from a point charge. Capacitance Calculator Find capacitance from stored charge and voltage. Capacitive Reactance Calculator Find a capacitor's reactance at a given frequency. Inductive Reactance Calculator Find an inductor's reactance at a given frequency. Cutoff Frequency Calculator Find the cutoff frequency of an RC filter. Conductivity to Resistivity Calculator Convert between electrical conductivity and resistivity. Drift Velocity Calculator Find the drift velocity of electrons in a conductor. Cyclotron Frequency Calculator Find the cyclotron frequency of a charged particle in a magnetic field. Lorentz Force Calculator Find the magnetic force on a moving charge. Magnetic Field of a Straight Wire Calculator Find the magnetic field around a straight current-carrying wire. Magnetic Permeability Calculator Find absolute permeability from relative permeability. Magnetic Dipole Moment Calculator Find the magnetic moment of a current loop. Dipole Moment Calculator Find an electric dipole moment from charge and separation. Gauss's Law Calculator Find the electric flux through a surface enclosing a charge. Faraday's Law Calculator Find the induced EMF from a changing magnetic flux. Excess Electrons Calculator Find the number of excess electrons for a given charge. Acceleration in the Electric Field Calculator Find the acceleration of a charge in an electric field. Electric Motor Torque Calculator Find motor torque from power and speed. Power Factor Calculator Find power factor from real and apparent power. AC Wattage Calculator Find real power in an AC circuit. kVA Calculator Find apparent power in kilovolt-amperes. Watt Calculator Find electrical power from voltage and current. Watt-hour Calculator Find energy in watt-hours from power and time. Watts to Amps Calculator Find the current draw from power and voltage. hp to Amps Calculator Find the current draw of a motor from its horsepower. Voltage Drop Calculator Find the voltage drop along a wire from current and resistance. Delta to Wye Conversion Calculator Convert three delta resistors to their wye equivalents. Current Divider Calculator Find how current splits between two parallel resistors. RC Circuit Calculator Find the time constant of a resistor-capacitor circuit. Capacitor Charge Time Calculator Find how long a capacitor takes to reach a target voltage. Resonant Frequency Calculator Find the resonant frequency of an LC circuit. RLC Impedance Calculator Find the impedance of a series RLC circuit. Inductor Energy Storage Calculator Find the energy stored in an inductor. Inductors in Series Calculator Find total inductance of inductors in series. Inductors in Parallel Calculator Find total inductance of inductors in parallel. Resistor Wattage Calculator Find the power a resistor dissipates and a safe rating. RMS Voltage Calculator Convert peak voltage to RMS and average values. Three Phase Calculator Find three-phase real power. Ideal Transformer Calculator Find secondary voltage and current from the turns ratio. Transformer Sizing Calculator Find the transformer kVA needed for a load. Wheatstone Bridge Calculator Find the unknown resistance in a balanced Wheatstone bridge. Solenoid Inductance Calculator Find the inductance of an air-core solenoid. Solenoid Magnetic Field Calculator Find the magnetic field inside a solenoid. Spherical Capacitor Calculator Find the capacitance of two concentric spheres. Low Pass Filter Calculator Find the cutoff frequency of an RC low-pass filter. High Pass Filter Calculator Find the cutoff frequency of an RC high-pass filter. Internal Resistance Calculator Find a battery's internal resistance from EMF and terminal voltage. Wire Resistance Calculator Find a wire's resistance from material, length and cross-section. Voltage Regulation Calculator Find the percentage voltage regulation of a supply. Noise Figure Calculator Find the noise figure from input and output SNR. Shockley Diode Calculator Find diode current from the Shockley equation. 555 Timer Calculator Find the frequency and duty cycle of an astable 555 timer. Buck Converter Calculator Find the output voltage of a step-down buck converter. Boost Converter Calculator Find the output voltage of a step-up boost converter. Crossover Calculator Find the crossover frequency for a speaker filter. Volt to Electron Volt Calculator Find the energy a charge gains across a voltage, in electron volts. Bridge Rectifier Calculator Find the DC output of a full-wave bridge rectifier. Capacitor Size Calculator Find the smoothing capacitor needed for a power supply. Dipole Calculator Find the length of a half-wave dipole antenna. Helical Coil Calculator Estimate the inductance of an air-core helical coil (Wheeler's formula). Magnetic Force Between Current-Carrying Wires Calculator Find the force between two parallel current-carrying wires. Magnetic Force on a Current-Carrying Wire Calculator Find the force on a wire in a magnetic field. Resistor Noise Calculator Find the thermal (Johnson) noise voltage of a resistor. RLC Circuit Calculator Find resonant frequency, Q factor and bandwidth of a series RLC circuit. Energy Density of Fields Calculator Find the energy density stored in electric and magnetic fields. Free Space Path Loss Calculator Find radio signal loss over a free-space path. Fresnel Zone Calculator Find the radius of the first Fresnel zone of a radio link. Hall Coefficient Calculator Find the Hall coefficient from carrier density. Insertion Loss Calculator Find insertion loss from input and output power. Skin Depth Calculator Find the skin depth of current in a conductor at high frequency. VSWR Calculator (Voltage Standing Wave Ratio) Find VSWR and return loss from the reflection coefficient. Frequency Bandwidth Calculator Find bandwidth from center frequency and quality factor. Watts to Lux Calculator Find illuminance from electrical power and luminous efficacy.

Gear Ratio Calculator Find gear ratio and output speed. Mechanical Advantage Calculator Find the mechanical advantage of a machine. Lever Calculator Find the effort force needed on a lever. Pulley Calculator Find the effort to lift a load with a pulley system. Belt Length Calculator Find the belt length between two pulleys. RPM to Linear Speed Calculator Convert wheel RPM to linear speed. Engine Displacement Calculator Find total engine displacement from bore, stroke and cylinders. Piston Force Calculator Find the force a piston produces from pressure and bore. Piston Speed Calculator Find the mean piston speed from stroke and engine rpm. Spring Rate Calculator Find a spring's rate from force and deflection. Pump Horsepower Calculator Find the hydraulic and brake horsepower of a pump. Wing Loading Calculator Find an aircraft's wing loading. Gear Ratio RPM Calculator Find output rpm from input rpm and gear ratio. Crawl Ratio Calculator Find a vehicle's overall crawl ratio. BMEP Calculator (Brake Mean Effective Pressure) Find brake mean effective pressure from torque and displacement. Carburetor CFM Calculator Find the carburetor airflow an engine needs. Fulcrum Calculator Balance a lever to find the unknown force. Linear Actuator Force Calculator Find the force from a hydraulic/pneumatic actuator. Prop Pitch Calculator Find the theoretical speed from propeller pitch and rpm. Prop Slip Calculator Find propeller slip from theoretical and actual speed. Shaft Size Calculator Find the minimum solid shaft diameter for a torque. Speeds and Feeds Calculator Find spindle RPM and feed rate for machining. Spring Calculator Find the rate of a helical compression spring. Torsion Spring Calculator Find the rate of a helical torsion spring. Transmission Calculator Find vehicle speed from engine rpm, gearing and tire size.

Buoyancy Calculator Find the buoyant force on a submerged object. Water Pressure at Depth Calculator Find fluid pressure at a given depth. Flow Rate Calculator Find volumetric flow rate from area and velocity. Pipe Velocity Calculator Find fluid velocity from flow rate and pipe area. Reynolds Number Calculator Find the Reynolds number to classify flow. Archimedes' Principle Calculator Find the buoyant force on a submerged object. API Gravity Calculator Convert specific gravity to API gravity for petroleum. Bernoulli Equation Calculator Find downstream pressure using Bernoulli's equation. Coefficient of Discharge Calculator Find the discharge coefficient from actual and theoretical flow. Cv Flow Calculator (Valve Flow Coefficient) Find liquid flow through a valve from its Cv and pressure drop. Darcy Weisbach Calculator Find pipe friction head loss with the Darcy–Weisbach equation. Darcy's Law Calculator Find groundwater flow rate through a porous medium. Differential Pressure Calculator Find the pressure difference between two points. Drag Equation Calculator Find aerodynamic drag force on a moving object. Froude Number Calculator Find the Froude number for open-channel or ship flow. Friction Factor Calculator Find the laminar Darcy friction factor from Reynolds number. Friction Loss Calculator Find friction head loss in a pipe (Darcy–Weisbach). Hydraulic Radius Calculator Find the hydraulic radius from flow area and wetted perimeter. Hydrostatic Pressure Calculator Find the pressure at a depth in a fluid. Hydraulic Pressure Calculator Find pressure from force on a piston area. Lift Coefficient Calculator Find the lift coefficient from lift force and flow conditions. Mach Number Calculator Find the Mach number from speed and speed of sound. Manometer Calculator Find pressure difference from a manometer fluid height. Mass Flow Rate Calculator Find mass flow rate from density, area and velocity. Orifice Flow Calculator Find flow through an orifice under a head of fluid. Pipe Flow Calculator Find volumetric flow rate from pipe diameter and velocity. Poiseuille's Law Calculator Find laminar flow rate through a narrow tube. Prandtl Number Calculator Find the Prandtl number of a fluid. Stokes' Law Calculator Find the drag force on a small sphere in viscous fluid. Water Density Calculator Find the density of pure water at a given temperature. Wind Load Calculator Find the wind force on a surface. Surface Tension Calculator Find surface tension from force and wetted length. Immersed Weight Calculator Find an object's apparent weight when submerged. Open Channel Flow Calculator Find open-channel flow rate using Manning's equation. Broad Crested Weir Calculator Find flow over a broad-crested weir. Hydraulic Jump Calculator Find the downstream depth after a hydraulic jump. Hydraulic Gradient Calculator Find the hydraulic gradient from head loss and length. Knudsen Number Calculator Find the Knudsen number to classify a flow regime. Moisture Content Calculator Find moisture content from wet and dry mass. Porosity and Permeability Calculator Find porosity from void and total volume. Water Viscosity Calculator Find the dynamic viscosity of water at a temperature. Pneumatic Cylinder Force Calculator Find the force from a pneumatic cylinder. Wind Correction Angle Calculator Find the heading correction for a crosswind.

Heat Energy Calculator Find heat to change a substance's temperature. Specific Heat Calculator Find specific heat from heat, mass and temperature change. Latent Heat Calculator Find heat for a phase change. Thermal Expansion Calculator Find length change from temperature. Carnot Efficiency Calculator Find the maximum efficiency of a heat engine. Boyle's Law Calculator Find the new pressure of a gas when its volume changes at constant temperature. Charles' Law Calculator Find the new volume of a gas when temperature changes at constant pressure. Gay-Lussac's Law Calculator Find the new pressure of a gas when temperature changes at constant volume. Combined Gas Law Calculator Relate pressure, volume and temperature changes of a gas. Ideal Gas Law Calculator Find gas pressure from amount, temperature and volume (PV = nRT). Ideal Gas Density Calculator Find the density of an ideal gas from pressure, temperature and molar mass. Heat Capacity Calculator Find the heat capacity of an object from mass and specific heat. Thermal Conductivity Calculator Find the heat conduction rate through a material. Thermal Resistance Calculator Find the thermal resistance of a material layer. Thermal Efficiency Calculator Find a heat engine's thermal efficiency. Thermal Diffusivity Calculator Find thermal diffusivity from conductivity, density and specific heat. Enthalpy Calculator Find enthalpy from internal energy, pressure and volume. Coefficient of Performance Calculator Find the COP of a refrigerator or heat pump (Carnot limit). Newton's Law of Cooling Calculator Find the temperature of a cooling object over time. Root Mean Square Velocity Calculator Find the RMS speed of gas molecules. Mean Free Path Calculator Find the average distance a gas molecule travels between collisions. Specific Gas Constant Calculator Find the specific gas constant from molar mass. Boltzmann Factor Calculator Find the Boltzmann factor e^(−E/kT). Thermal Stress Calculator Find the stress from a constrained temperature change. Joule Heating Calculator Find the heat generated by current in a resistor. Water Heating Calculator Find the energy needed to heat water. Heat Transfer Coefficient Calculator Find the convective heat transfer coefficient. Heat Transfer Calculator Find the heat needed to change a substance's temperature. Calorimetry Calculator Find the equilibrium temperature when two substances mix. Thermal Energy Calculator Find the thermal energy of an ideal monatomic gas. Thermal Equilibrium Calculator Find the heat transferred between two bodies reaching equilibrium. Sensible Heat Calculator Find the sensible heat load of an airflow (HVAC). Mixed Air Temperature Calculator Find the temperature of two blended air streams. LMTD Calculator (Log Mean Temperature Difference) Find the log mean temperature difference of a heat exchanger. Nusselt Number Calculator Find the Nusselt number for convective heat transfer. Biot Number Calculator Find the Biot number for transient heat conduction. Compressibility Factor Calculator Find how much a real gas deviates from ideal behavior. Van der Waals Equation Calculator Find real-gas pressure using the van der Waals equation. Curie's Law Calculator Find paramagnetic magnetization from Curie's law. Electrical Mobility Calculator Find charge carrier mobility from drift velocity and field.

Dew Point Calculator Find the dew point from temperature and humidity. Heat Index Calculator Find the 'feels like' temperature from heat and humidity. Air Density Calculator Find air density from pressure and temperature. Absolute Humidity Calculator Find absolute humidity from temperature and relative humidity. Relative Humidity Calculator Find relative humidity from temperature and dew point. Air Pressure at Altitude Calculator Find atmospheric pressure at a given altitude. Temperature at Altitude Calculator Find air temperature at altitude using the standard lapse rate. Density Altitude Calculator Find density altitude from pressure altitude and temperature. Cloud Base Calculator Estimate the height of cumulus cloud bases. Lightning Distance Calculator Estimate how far away lightning struck from the thunder delay. True Airspeed Calculator Estimate true airspeed from indicated airspeed and altitude. Kinematic Viscosity Calculator Find kinematic viscosity from dynamic viscosity and density. Mixing Ratio of Air Calculator Find the water vapor mixing ratio of air. Virtual Temperature Calculator Find the virtual temperature of moist air. Wet Bulb Calculator Estimate the wet-bulb temperature from temperature and humidity.

Escape Velocity Calculator Find the speed to escape a body's gravity. Orbital Velocity Calculator Find the speed needed for a circular orbit. Orbital Period Calculator Find the period of a circular orbit (Kepler's third law). Schwarzschild Radius Calculator Find a black hole's event horizon radius. Delta V Calculator Find a rocket's change in velocity from the Tsiolkovsky equation. Rocket Equation Calculator Find delta-v from specific impulse and mass ratio. Specific Impulse Calculator Find a rocket engine's specific impulse from thrust and propellant flow. Rocket Thrust Calculator Find rocket thrust from propellant flow and exhaust velocity. Thrust to Weight Ratio Calculator Find the thrust-to-weight ratio of a rocket or aircraft. Earth Orbit Calculator Find orbital speed and period at a given altitude above Earth. Kepler's Third Law Calculator Find an orbital period from the semi-major axis (around the Sun). Synodic Period Calculator Find the synodic period between two orbiting bodies. Hohmann Transfer Calculator Find the delta-v for a Hohmann transfer between circular Earth orbits. Exoplanet Discovery Calculator Find the transit depth a planet produces crossing its star. Drake Equation Calculator Estimate the number of communicating civilizations in the galaxy. Black Hole Temperature Calculator Find the Hawking temperature of a black hole. Hubble Law Distance Calculator Find recession velocity from distance using Hubble's law. Redshift Calculator Find redshift and recession velocity from wavelengths. Luminosity Calculator Find a star's luminosity from its radius and temperature. Parallax Calculator Find a star's distance from its parallax angle. Radiation Pressure Calculator Find the pressure exerted by light on a surface. Universe Expansion Calculator Estimate the Hubble time (age of the universe) from the Hubble constant. Sun Angle Calculator Find the sun's elevation at solar noon.

E = mc² Calculator Find the energy equivalent of a mass. Time Dilation Calculator Find how time slows at relativistic speed. Length Contraction Calculator Find how length shrinks at relativistic speed. Lorentz Factor Calculator Find the relativistic Lorentz factor γ. Relativistic Kinetic Energy Calculator Find kinetic energy at relativistic speeds. Velocity Addition Calculator Add velocities the relativistic way. Electron Speed Calculator Find an electron's speed after acceleration through a voltage. Gravitational Time Dilation Calculator Find how gravity slows time near a massive body.

Photon Energy Calculator Find a photon's energy from its frequency. De Broglie Wavelength Calculator Find the matter wavelength of a moving particle. Hydrogen Energy Levels Calculator Find the energy of a hydrogen electron's nth level. Bohr Model Calculator Find the orbit radius and energy of a hydrogen electron. Rydberg Equation Calculator Find the wavelength of a hydrogen spectral line. Photoelectric Effect Calculator Find the maximum kinetic energy of ejected photoelectrons. Frequency of Light Calculator Convert a light wavelength to its frequency. Energy to Wavelength Calculator Convert photon energy to its wavelength. Compton Wavelength Calculator Find the Compton wavelength of a particle. Compton Scattering Calculator Find the wavelength shift when a photon scatters off an electron. Heisenberg's Uncertainty Principle Calculator Find the minimum momentum uncertainty from a position uncertainty. Stefan Boltzmann Law Calculator Find the power radiated per area by a blackbody. Wien's Law Calculator Find the peak emission wavelength of a blackbody. Magnetic Moment Calculator Find the spin-only magnetic moment from unpaired electrons. Curie Constant Calculator Find the Curie constant from carrier density and magnetic moment. Quantum Number Calculator Find the orbitals and electron capacity of a shell.

Stress Calculator Find mechanical stress from force and area. Strain Calculator Find strain from length change. Young's Modulus Calculator Find Young's modulus from stress and strain. Specific Gravity Calculator Find specific gravity relative to water. Bulk Modulus Calculator Find a material's bulk modulus from pressure and volume change. Shear Modulus Calculator Find shear modulus from shear stress and strain. Poisson's Ratio Calculator Find Poisson's ratio from lateral and axial strain. Elongation Calculator Find how much a bar stretches under tension. Factor of Safety Calculator Find the factor of safety from strength and working stress. Hoop Stress Calculator Find the hoop stress in a thin-walled pressure vessel. Shear Stress Calculator Find shear stress from force and area. Section Modulus Calculator Find the section modulus of a rectangular beam. Buckling Calculator Find the Euler critical buckling load of a column. Natural Frequency Calculator Find the natural frequency of a spring-mass system. Number Density Calculator Find the number of atoms per cubic metre. True Strain Calculator Convert engineering strain to true strain. Principal Stress Calculator Find the principal stresses from a 2D stress state. Mohr's Circle Calculator Find the center, radius and max shear of Mohr's circle. Von Mises Stress Calculator Find the von Mises equivalent stress from two principal stresses. Elastic Constants Calculator Find shear and bulk modulus from Young's modulus and Poisson's ratio. Shear Strain Calculator Find shear strain from lateral displacement and height. Shear Wave Velocity Calculator Find the shear (S-wave) velocity in a solid. Slenderness Ratio Calculator Find a column's slenderness ratio. Stress Concentration Factor Calculator Find the peak stress at a geometric feature. Torsional Constant Calculator Find the polar moment / torsional constant of a solid round shaft. Torsional Stiffness Calculator Find the torsional stiffness of a shaft. Angle of Twist Calculator Find how much a shaft twists under torque. Angle of Repose Calculator Find the angle of repose from the friction coefficient. Brinell Hardness Number Calculator Find the Brinell hardness number (BHN). Vickers Hardness Number Calculator Find the Vickers hardness number (HV). Impact Test Calculator Find the energy absorbed in a pendulum impact (Charpy/Izod) test. Copper Wire Weight Calculator Find the mass of a copper wire. Gold Weight Calculator Find the mass of a volume of gold. Volume to Mass Calculator Find mass from volume and density. Bend Allowance Calculator Find the bend allowance for sheet metal forming.