Hooke's Law Calculator
📐 Physics of Matter. Use the Hooke's law formula to find force, spring constant, stretch: pick the value you want, type the others, and the answer updates as you go.
Force-5 N
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Force | N |
| Spring constant | N/m |
| Stretch | m |
Worked example
Find the force when Spring constant = 100 N/m, Stretch = 0.05 m.
Using F = -kx: Force = -5 N.
Frequently asked questions
What is the formula for Hooke's law?
F = -kx.
What do the letters stand for, and what units are used?
Force in N, Spring constant in N/m, Stretch in m.
How do you calculate force?
Put the values into F = -kx. For example, with Spring constant = 100 N/m, Stretch = 0.05 m, force = -5 N.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (force, spring constant, stretch) and fill in the others: it rearranges the formula for you.
