What this calculator does
Hooke's law & spring energy works out restoring force and stored energy of a stretched or compressed spring. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaF = kx; Elastic PE = ½kx²
The inputs explained
| Field | What to enter |
|---|---|
| Spring constant (N/m) | A number, measured in N/m. Starts at 250. |
| Displacement from rest (m) | A number, measured in m. Starts at 0.05. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with spring constant
Every other input is held at the calculator’s starting values while spring constant varies. Select any row to load that scenario into the calculator.