🪝 Force Converter
By ToolNimba Editorial Team · Updated 2026-06-19
Type in any box and every other unit updates instantly.
This force converter switches between newtons, kilonewtons, dyne, kilogram-force, pound-force and ounce-force. Type a value into any field and every other unit updates at once, so you can move between metric (SI) and imperial or gravitational units without reaching for a separate chart. Everything is computed through the newton, the SI unit of force, which keeps the conversions exact and consistent.
What is the Force Converter?
Force is what changes the motion of an object, and in the SI system it is measured in newtons (N). One newton is the force that gives a one-kilogram mass an acceleration of one metre per second squared, which comes straight from Newton's second law, F = m × a. Every other unit on this page is just a different sized package of the same physical quantity, so converting between them is a matter of scaling to and from the newton.
Some of these units come from older or non-SI systems. The dyne is the centimetre-gram-second (CGS) unit, equal to exactly 0.00001 N, and it still appears in older physics texts and in surface-tension figures. Kilogram-force (kgf) and pound-force (lbf) are gravitational units: they express force as the weight of a given mass under standard gravity. One kgf is the weight of one kilogram under standard gravity (9.80665 m/s squared), so 1 kgf = 9.80665 N exactly. One pound-force is the weight of one pound and equals 4.4482216 N, while ounce-force is simply one sixteenth of that.
A common point of confusion is mass versus force. A kilogram is a unit of mass, while kilogram-force is a unit of force (weight). They share a number only because the conversion is defined at standard gravity. Away from Earth's surface, or for precise engineering, the distinction matters: a 10 kg object still has a mass of 10 kg on the Moon, but its weight there is far less than 10 kgf. This tool converts force units only, so the figures assume you already have a force value, not a bare mass.
When to use it
- Converting a sensor or load-cell reading from newtons to pounds-force for a spec sheet written in imperial units.
- Translating a kgf torque or clamping-force figure from a European data sheet into newtons for a calculation.
- Checking what a thrust or tension quoted in lbf works out to in kN for a structural or mechanical estimate.
- Reading older physics or chemistry material that quotes forces and surface tension in dyne.
How to use the Force Converter
- Type your value into the field for the unit you already have (for example, newtons).
- Read the converted value straight from any of the other unit fields.
- Switch the unit you type into at any time, the others always follow the field you are editing.
- Press Clear to reset every field and start a new conversion.
Formula & method
Worked examples
Convert 100 newtons to pound-force.
- The value is already in newtons, so value in N = 100 N
- Divide by the lbf factor: 100 ÷ 4.4482216
- 100 ÷ 4.4482216 = 22.4809 lbf
Result: 100 N ≈ 22.481 lbf
Convert 50 kilogram-force to newtons and to pound-force.
- Multiply by the kgf factor to get newtons: 50 × 9.80665 = 490.3325 N
- Divide that by the lbf factor: 490.3325 ÷ 4.4482216
- 490.3325 ÷ 4.4482216 = 110.233 lbf
Result: 50 kgf = 490.3325 N ≈ 110.23 lbf
Convert 10 pound-force to newtons and to kilogram-force.
- Multiply by the lbf factor to get newtons: 10 × 4.4482216 = 44.482216 N
- Divide that by the kgf factor: 44.482216 ÷ 9.80665
- 44.482216 ÷ 9.80665 = 4.5359 kgf
Result: 10 lbf = 44.482216 N ≈ 4.536 kgf
Force conversion factors, value of one of each unit expressed in newtons
| Unit | Symbol | Value in newtons (N) |
|---|---|---|
| Newton | N | 1 |
| Kilonewton | kN | 1000 |
| Dyne | dyn | 0.00001 |
| Kilogram-force | kgf | 9.80665 |
| Pound-force | lbf | 4.4482216 |
| Ounce-force | ozf | 0.27801385 |
Quick reference, common newton values in pound-force and kilogram-force
| Newtons (N) | Pound-force (lbf) | Kilogram-force (kgf) |
|---|---|---|
| 1 | 0.2248 | 0.1020 |
| 10 | 2.2481 | 1.0197 |
| 100 | 22.481 | 10.197 |
| 1000 | 224.81 | 101.97 |
Common mistakes to avoid
- Treating kilograms as a force. A kilogram measures mass, not force. Only kilogram-force (kgf) is a force, equal to the weight of one kilogram under standard gravity. If you start from a mass in kg, multiply by gravity (about 9.80665 m/s squared) to get newtons before comparing forces.
- Confusing pound-force with pound-mass. The "pound" is used for both mass (lbm) and force (lbf). This tool handles pound-force, the weight of one pound. Mixing the two leads to errors of a factor of about 32.174 in some engineering formulas, so confirm which pound a source means.
- Using a rounded conversion factor for precise work. Quick figures like 1 N ≈ 0.225 lbf are fine for estimates, but for engineering use the full factor 4.4482216 N per lbf and 9.80665 N per kgf. The tool keeps the exact factors so the result stays accurate.
- Forgetting that dyne is a tiny unit. One dyne is only 0.00001 N, so converting newtons to dyne gives very large numbers and the reverse gives very small ones. A misplaced power of ten here is easy, which is exactly why converting through newtons automatically helps.
Glossary
- Force
- A push or pull that can change an object's motion, measured in newtons in the SI system.
- Newton (N)
- The SI unit of force, the force that accelerates a 1 kg mass at 1 metre per second squared.
- Dyne (dyn)
- The CGS unit of force, equal to exactly 0.00001 newtons.
- Kilogram-force (kgf)
- A gravitational force unit, the weight of one kilogram under standard gravity, equal to 9.80665 N.
- Pound-force (lbf)
- An imperial force unit, the weight of one pound, equal to 4.4482216 N.
- Standard gravity
- The agreed value of gravitational acceleration, 9.80665 metres per second squared, used to define kgf and lbf.
Frequently asked questions
How do I convert newtons to pounds-force?
Divide the value in newtons by 4.4482216, since one pound-force equals 4.4482216 N. For example, 100 N ÷ 4.4482216 ≈ 22.48 lbf. The converter does this for you the moment you type a value into the newton field.
How many newtons are in 1 kgf?
Exactly 9.80665 newtons. Kilogram-force is defined as the weight of one kilogram under standard gravity (9.80665 m/s squared), so 1 kgf = 9.80665 N. To convert kgf to N, multiply by 9.80665; to go the other way, divide by it.
What is a dyne and how does it relate to a newton?
A dyne is the unit of force in the centimetre-gram-second (CGS) system. One dyne equals 0.00001 N, which means 1 N = 100,000 dyne. The dyne still turns up in older physics texts and in some surface-tension measurements.
Is kilogram-force the same as a kilogram?
No. A kilogram is a unit of mass, while kilogram-force is a unit of force equal to the weight of one kilogram under standard gravity. They share the same number only at standard gravity, so a 1 kg mass weighs 1 kgf on Earth but less elsewhere.
What is the difference between pound-force and pound-mass?
Pound-force (lbf) is a unit of force, while pound-mass (lbm) is a unit of mass. They are numerically equal only under standard gravity. This tool works with pound-force. Be careful in formulas, since mixing the two introduces a factor of about 32.174.
Why convert everything through newtons?
The newton is the SI base unit for force, so every other unit has a fixed factor relative to it. Converting your input to newtons first and then out to the target unit avoids chained rounding and keeps results consistent across all six units at once.