Pound-Inches to Newton Meters Converter
Enter a value below to convert pound-inches to newton meters - one pound-inch equals 0.1129848333 N·m (1 N·m = 8.8507 lb-in). For the reverse, use our newton meters to pound-inches converter.
1 lbf·in = 0.112985 N·m. Convert pound-force inches to newton meters. Need the reverse? See N·m to lbf·in.
Pound-force inch
- Definition
- A pound-force inch (symbol: lbf·in), often written lb-in or in-lb, is a unit of torque equal to one pound-force applied on a one-inch lever arm. There are exactly 12 pound-inches in one pound-foot.
- History / origin
- Like the pound-foot it derives from the pound-force and the inch, one twelfth of a foot. It is the small-scale companion to the pound-foot, suited to light fasteners where a pound-foot would be an awkwardly small fraction.
- Current use
- Pound-inches are widely used for low-torque assembly in the United States - electronics, instruments, small engines and bicycle parts - and are marked on inch-pound torque wrenches and torque screwdrivers.
Newton meter
- Definition
- A newton meter (symbol: N·m) is the SI unit of torque, or moment of force. One newton meter is the turning effect of a force of one newton applied at the end of a one-meter lever arm, perpendicular to it.
- History / origin
- It is a derived SI unit combining the newton - the unit of force named after Sir Isaac Newton - with the meter. A newton meter is dimensionally the same as the joule, but the joule is reserved for energy while torque is expressed in newton meters.
- Current use
- The newton meter is the standard torque unit worldwide for engineering, physics and modern vehicle specifications, where fastener, axle and engine torques are quoted in N·m.
Pound-force inch to newton meter conversion table
| Pound-force inch [lbf·in] | Newton meter [N·m] |
|---|---|
| 1 lbf·in | 0.1129848333 N·m |
| 2 lbf·in | 0.2259696667 N·m |
| 3 lbf·in | 0.3389545 N·m |
| 5 lbf·in | 0.5649241667 N·m |
| 10 lbf·in | 1.1298483333 N·m |
| 15 lbf·in | 1.6947725 N·m |
| 20 lbf·in | 2.2596966667 N·m |
| 25 lbf·in | 2.8246208333 N·m |
| 30 lbf·in | 3.389545 N·m |
| 40 lbf·in | 4.5193933333 N·m |
| 50 lbf·in | 5.6492416667 N·m |
| 75 lbf·in | 8.4738625 N·m |
| 100 lbf·in | 11.2984833333 N·m |
| 150 lbf·in | 16.947725 N·m |
| 200 lbf·in | 22.5969666667 N·m |
| 300 lbf·in | 33.89545 N·m |
Popular pound-force inch to newton meter conversions
Everyday torque values, rounded to two decimals - the kind of figures you meet on real-world torque specifications.
| Pound-force inch [lbf·in] | Newton meter [N·m] |
|---|---|
| 5 lbf·in | 0.56 N·m |
| 10 lbf·in | 1.13 N·m |
| 15 lbf·in | 1.69 N·m |
| 20 lbf·in | 2.26 N·m |
| 25 lbf·in | 2.82 N·m |
| 30 lbf·in | 3.39 N·m |
| 40 lbf·in | 4.52 N·m |
| 50 lbf·in | 5.65 N·m |
| 75 lbf·in | 8.47 N·m |
| 100 lbf·in | 11.30 N·m |
| 120 lbf·in | 13.56 N·m |
| 150 lbf·in | 16.95 N·m |
How to convert pound-force inches to newton meters
To convert pound-inches to newton meters, multiply the pound-inch value by 0.1129848333. For example, 20 lbf·in = 20 × 0.1129848333 = 2.26 N·m.
One pound-inch is defined here as 0.1129848333 newton meters (a twelfth of a pound-foot), so converting is a single multiplication:
N·m = lbf·in × 0.1129848333
1 lbf·in = 0.1129848333 N·m · 1 N·m = 8.850745454 lbf·in
Example. To convert 100 lbf·in to newton meters, multiply by 0.1129848333: 100 lbf·in = 100 × 0.1129848333 = 11.3 N·m. Going the other way, 3 N·m is 3 × 8.850745454 = 26.55 lbf·in.
When you need to convert pound-force inches to newton meters
Pound-inch to newton-meter conversion is needed when an inch-pound spec must be applied with a metric gauge. Common cases:
- Applying an in-lb fastener spec using a torque tool that reads newton meters.
- Converting electronics and instrument assembly torque from lb-in to N·m.
- Translating US small-engine or bicycle in-lb specs for a metric workshop.
- Bringing low imperial torque values onto a metric calibration sheet.
- Cross-checking an inch-pound table against newton-meter values.
Frequently asked questions
How do I convert pound-inches to newton meters?
Multiply the pound-inch value by 0.1129848333. For example, 20 lbf·in equals about 2.26 N·m.
How many newton meters is 1 pound-inch?
One pound-inch equals 0.1129848333 newton meters.
How many newton meters is 50 in-lb?
50 lbf·in equals about 5.65 newton meters (5.6492416667 N·m to be exact).
How many pound-inches are in a newton meter?
There are about 8.85 pound-inches in one newton meter.
What is the formula to convert in-lb to N·m?
Multiply the pound-inch value by 0.1129848333, because one pound-inch equals 0.1129848333 newton meters.
How do I convert newton meters back to pound-inches?
Multiply the newton-meter value by 8.850745454, or use our newton meters to pound-inches converter.
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