Spring Rate Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the force applied and the resulting deflection.
- Read the spring rate.
How it works
Spring rate k = force ÷ deflection (Hooke's law).
Worked example
100 N over 20 mm. = 5 N/mm.
Common mistakes
- Measuring deflection beyond the spring's linear range.
- Mixing units — keep force in N and deflection in mm for N/mm.
Frequently asked questions
What does spring rate mean?
How much force it takes to compress or extend the spring by one unit — higher means a stiffer spring.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.