Spiral Length Calculator
Estimate the length of an Archimedean spiral.
Estimate how long a spiral is — like a rolled tape, wire or clock spring.
The math behind it
Treating each loop as a circle whose radius grows steadily, the total length is about π × turns × (inner radius + outer radius).
Worked example
Inner 1, outer 10, 5 turns → π·5·11 ≈ 172.8.
FAQ
How accurate is this?
It's a close approximation for evenly spaced spirals; exact length needs an integral.