Centripetal Acceleration Calculator — a = v²/r

Anything moving in a circle is constantly accelerating toward the center — even at steady speed, because the direction of velocity keeps changing.

$a = \frac{v^2}{r}$

Solve for

Tangential speed (v)

Unit

Radius (r)

Unit

Result unit

How to interpret the result

A car taking a 50 m radius corner at 20 m/s needs 8 m/s² of inward acceleration — nearly 1 g, supplied by tire friction.