How it works
Apply Hooke’s law within a spring’s elastic range. The restoring force opposes displacement and stored energy is nonnegative.
F = −kx; U = kx²/2
Worked example
Show example inputs and result
Spring constant: 100 · Displacement: 0.2.
- Restoring force
- -20 N
- Stored energy
- 2 J
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy