Health Calculators

BMI Calculator Calculate Body Mass Index from weight and height.

Ideal Weight Calculator Estimate a healthy body weight for your height (Devine formula).

Body Fat Calculator Estimate body fat percentage using the U.S. Navy method.

Lean Body Mass Calculator Estimate lean body mass from weight and body fat.

Waist to Hip Ratio Calculator Find your waist-to-hip ratio.

Waist to Height Ratio Calculator Find your waist-to-height ratio.

Body Surface Area Calculator Estimate body surface area (Mosteller formula).

A Body Shape Index (ABSI) Calculator Estimate body shape risk from waist, BMI and height.

Body Adiposity Index (BAI) Calculator Estimate body fat percentage from hip and height.

Ponderal Index Calculator A height-corrected leanness index.

Fat-Free Mass Index (FFMI) Calculator Measure muscularity independent of height.

Relative Fat Mass (RFM) Calculator Estimate body fat from height and waist.

Body Roundness Index (BRI) Calculator Estimate body roundness from waist and height.

Adjusted Body Weight Calculator Find adjusted body weight from ideal and actual weight.

Overweight Calculator Find how much weight to lose to reach a normal BMI.

Weight Loss Percentage Calculator Find the percentage of body weight lost.

BMI Prime Calculator Find BMI Prime (BMI relative to the upper normal limit).

Body Frame Size Calculator Estimate frame size from height and wrist.

Skinfold Body Fat Calculator 3-site Jackson-Pollock body fat.

BMI Weight Loss Calculator Weight to reach a target BMI.

MAP Calculator (Mean Arterial Pressure) MAP = (2×DBP + SBP) ÷ 3.

QTc Calculator (Bazett) QTc = QT ÷ √RR.

Peak Flow Calculator Estimated peak expiratory flow.

Depression Screening (PHQ-9) Calculator PHQ-9 depression screening score.

Anxiety Screening (GAD-7) Calculator GAD-7 anxiety screening score.

Blood Volume Calculator Estimated total blood volume.

Draw Length Calculator Archery draw length from arm span.

Pulse Pressure Calculator SBP − DBP.

Shock Index Calculator HR ÷ SBP.

Total Body Water Calculator Watson formula for total body water.

ANC Calculator Absolute neutrophil count.

Neutrophil-to-Lymphocyte Ratio Calculator NLR = neutrophils ÷ lymphocytes.

APGAR Score Calculator Newborn assessment scoring.

Braden Score Calculator Pressure-ulcer risk assessment.

Tidal Volume Calculator Ideal body weight-based tidal volume.

GCS Calculator (Glasgow Coma Scale) Level of consciousness scoring.

FIB-4 Calculator Liver fibrosis index.

Incidence Rate Calculator New cases per population.

Mortality Rate Calculator Deaths per population.

NNT Calculator Number needed to treat.

Centor Score Calculator Strep throat probability.

BMR Calculator Find your Basal Metabolic Rate (Mifflin–St Jeor equation).

TDEE Calculator Estimate daily calorie needs (Total Daily Energy Expenditure).

Water Intake Calculator Estimate recommended daily water intake from body weight.

Macro Calculator Split a calorie target into protein, carbs and fat grams.

Protein Intake Calculator Estimate daily protein needs from body weight.

Harris-Benedict BMR Calculator Estimate BMR with the Harris-Benedict equation.

Katch-McArdle BMR Calculator Estimate BMR from lean body mass.

Calorie Deficit Calculator Find intake and weight loss from a calorie deficit.

Carbohydrate Calculator Find daily carb grams from calories.

Fat Intake Calculator Find daily fat grams from calories.

Fiber Intake Calculator Find recommended daily fiber from calories.

Net Carbs Calculator Find net carbs from total carbs and fiber.

Keto Macros Calculator Find keto fat grams after fixing carbs and protein.

Added Sugar Intake Calculator Find the recommended added-sugar limit.

Sodium in Salt Calculator Convert salt to sodium content.

Basal Energy Expenditure (BEE) Calculator Harris-Benedict BEE (original 1919).

Calorie Calculator General daily calorie needs.

Weight Gain Calculator Calorie surplus for weight gain.

Blood Sugar Converter mg/dL ↔ mmol/L.

A1c to Average Blood Sugar Calculator HbA1c to estimated average glucose.

Cholesterol Ratio Calculator Total cholesterol / HDL.

LDL Calculator (Friedewald) LDL = Total − HDL − (TG/5).

VLDL Calculator VLDL = Triglycerides ÷ 5.

Anion Gap Calculator Na − Cl − HCO3.

Corrected Calcium Calculator Adjust calcium for albumin level.

IV Flow Rate Calculator Drops per minute from volume and time.

HOMA-IR Calculator Insulin resistance index.

QUICKI Calculator Quantitative insulin sensitivity check.

Estimated Energy Requirement Calculator EER (Institute of Medicine formula).

IIFYM Macro Calculator If It Fits Your Macros — flexible dieting.

Cholesterol Units Converter mg/dL ↔ mmol/L.

Plasma Osmolality Calculator 2×Na + glucose/18 + BUN/2.8.

Max Heart Rate Calculator Estimate your maximum heart rate from age.

Target Heart Rate Calculator Find your training heart-rate zone.

Karvonen Heart Rate Calculator Find target heart rate using heart rate reserve.

Heart Rate Zones Calculator Find your training heart-rate zones by age.

Dog Walking Benefits Calculator Calories and time spent walking a dog.

Maintenance Fluids Calculator Pediatric 4-2-1 rule.

Sleep Cycle Calculator Find how many 90-minute sleep cycles you get.

Sleep Debt Calculator Find accumulated sleep debt over several days.

Sleep Calculator Best wake times from ~90-min cycles.

Wake Up Calculator Best wake-up time from sleep cycles.

Pregnancy Weeks Calculator Find pregnancy progress from days since last period.

Pregnancy Weight Gain Calculator Find recommended pregnancy weight gain by pre-pregnancy BMI.

Conception Calculator Estimate conception date from due date.

Ovulation Calculator Find your fertile window.

Period Calculator Predict your next period.

Blood Alcohol Content (BAC) Calculator Estimate blood alcohol concentration (educational only).

Standard Drink Calculator Convert a drink's size and strength to standard drinks.

Alcohol Units Calculator (UK) Find UK alcohol units in a drink.

Pack Year Calculator Estimate smoking pack-years.

Caffeine Calculator Caffeine half-life tracker.

Sobriety Calculator Time since last drink.