Spring Constant Calculator – Hooke's Law F = -kx
Calculate spring constant, force, or displacement using Hooke's Law F = -kx.
How It Works
Enter any two of force (N), spring constant k (N/m), and displacement x (m). The calculator solves for the third. The negative sign indicates restoring direction; this tool returns magnitudes.
Formula
F = -k × x
Frequently Asked Questions
What is Hooke's Law?
Hooke's Law states that the force exerted by a spring is proportional to its displacement: F = kx. A spring with k = 200 N/m stretched 0.1 m exerts 20 N.
What are typical spring constants?
Soft springs: 10–100 N/m. Car suspension: 10,000–50,000 N/m. Stiff engineering springs: 100,000+ N/m.