Convert force between pounds-force and newtons with support for kilonewtons and kilogram-force.
Force is a push or pull acting on an object. In physics, force is commonly described by Newton’s second law: F = m × a.
The SI unit of force is the newton (N). In imperial usage, force is often expressed as pounds-force (lbf).
Pound-force and pound-mass are not the same thing. Pound-force measures force, while pound-mass measures mass.
Example 1: Convert 100 pounds-force to newtons
Step 1: Use the formula
Step 2: Substitute the value
Example 2: Convert 444.822 newtons to pounds-force
Step 1: Use the reverse formula
Step 2: Substitute the value
| lbf | N |
|---|---|
| 1 | 4.44822 |
| 5 | 22.2411 |
| 10 | 44.4822 |
| 25 | 111.2055 |
| 50 | 222.411 |
| 100 | 444.822 |
| 250 | 1,112.055 |
| 500 | 2,224.11 |
| 1000 | 4,448.22 |
| N | lbf |
|---|---|
| 4.44822 | 1 |
| 22.2411 | 5 |
| 44.4822 | 10 |
| 111.2055 | 25 |
| 222.411 | 50 |
| 444.822 | 100 |
| 1,112.055 | 250 |
| 2,224.11 | 500 |
| 4,448.22 | 1000 |
lb usually refers to pound-mass, while lbf means pound-force. They are related on Earth, but they are not the same physical quantity.
Newtons are the standard SI unit of force and are widely used in science, engineering, and international specifications.
Kilogram-force is the force exerted by standard gravity on a one-kilogram mass. It is equal to 9.80665 newtons.
Kilonewtons are convenient for large forces such as structural loads, vehicle dynamics, industrial equipment, and aerospace applications.
The exact value is 4.4482216152605, but this calculator uses the rounded engineering factor of 4.44822 N per lbf, which is accurate enough for typical engineering and technical calculations.
These are common secondary force units found in engineering documents, datasheets, and international references.
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