Hooke’s Law and Spring Constant Calculator
Rearranges Hooke’s law for whichever value you need.
Answer
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Force —
Spring constant — N/m
In pounds per inch — lbf/in
Extension or compression —
Energy stored —
Assumes —
The formula
F = k × x
k is the spring constant and x the change from the natural length. The spring pulls back in the opposite direction to the stretch.
What to watch out for
To measure a spring constant, hang a known mass, measure the stretch, and divide its weight by that stretch.
Frequently Asked Questions
How do I find a spring constant?
Divide force by extension. A 1 kg mass stretching a spring by 2 cm gives 490.3 N/m.
What force does a 500 N/m spring give at 10 cm?
50 N.