Elastic Potential Energy Calculator — PE = ½kx²

Stretching a spring stores energy — the work you did becomes elastic potential energy, growing with the square of the stretch.

$PE = \frac{1}{2}kx^2$

Solve for

Elastic potential energy (PE)

Unit

Spring constant (k)

Unit

Result unit

How to interpret the result

Doubling the stretch quadruples the stored energy — which is why a drawn bow gets dramatically more powerful the further you pull.