๐งฒ Force Converter
Convert between newtons (N), kilogram-force (kgf), pound-force (lbf), dynes, and other force units in real time. Useful for checking machine tool specs, physics homework, or converting units on tools like torque wrenches.
How to use
- Enter a value into any force unit field (N, kN, kgf, lbf, or dyn).
- The converted values appear instantly in the other unit fields.
How the calculation works
The SI unit of force is the newton (N), defined as the force that gives a one-kilogram mass an acceleration of 1 m/sยฒ (F = ma). The kilogram-force (kgf) is the force a one-kilogram mass experiences under standard gravity: 1 kgf = 9.80665 N. That 9.80665 m/sยฒ is the internationally agreed standard acceleration of gravity; real gravity varies slightly with latitude and altitude. So when people say something "weighs 1 kg", as a force they mean about 9.8 N. The pound-force (lbf) is standard gravity acting on one pound of mass, about 4.448 N. The dyne is the CGS unit of force, 10โปโต N. Force and torque (turning force) are different quantities, so do not confuse these with torque units such as Nยทm or kgfยทm.
Worked example
A shelf bracket rated to 50 kgf, in newtons 50 ร 9.80665 โ 490.3 N A tool marked "100 lbf" applies 100 ร 4.44822 โ 444.8 N, or about 45.4 kgf.
Things to be aware of
- kgf is a force; kg is a mass. Mixing them up introduces a factor of about 9.8.
- This converts force. It cannot be used for tightening torque (Nยทm, kgfยทcm and so on).
- Real gravitational acceleration varies by about 0.5% from place to place; kgf figures assume standard gravity.
- The dyne is very small; you may see it in values such as surface tension.
FAQ
What's the difference between kgf and N?
kgf (kilogram-force) is based on the gravitational force on a 1 kg mass โ 1 kgf is about 9.80665 N.
Can I use this to convert tool tightening torque?
This tool converts force units (N, kgf, etc.), not torque units (like Nยทm, a rotational force), so please use a dedicated torque conversion for tightening specs.
Is this useful for checking imported equipment specs?
Yes โ it's handy for converting an lbf rating on imported equipment to N for comparison with domestic specs.