Torque from one pound-force at one inch.
Pound-inches to Newton meters Converter — lb in to N m
Convert Pound-inch (lb in) to Newton meter (N m) using the exact conversion factor (1 pound-inch = 0.112984829 newton meter). See the formula, worked examples, conversion table, history, and common uses.
Pound-inches to Newton meters converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Newton meter is the SI torque unit.
Result = input x 0.112984829 / 1.
Torque units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Pound-inches to Newton meters
Pound-inch and Newton meter both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Torque from one pound-force at one inch, and newton meter is the SI torque unit.
Formula
newton meters = pound-inches × 0.112984829028
This factor comes from each unit's defined relationship to the category's base unit: 1 pound-inch equals 0.112984829028 base units, and 1 newton meter equals 1 base unit, so dividing one by the other gives the direct pound-inch-to-newton meter factor of 0.112984829028.
Simple example
1 lb in × 0.112984829 = 0.112984829 N m
1 pound-inch = 0.112984829 newton meters.
Real-world example
100 lb in × 0.112984829 = 11.2984829 N m
100 pound-inches = 11.2984829 newton meters.
Conversion table
| Pound-inch (lb in) | Newton meter (N m) |
|---|---|
| 1 lb in | 0.112984829 N m |
| 10 lb in | 1.12984829 N m |
| 50 lb in | 5.649241451 N m |
| 100 lb in | 11.2984829 N m |
| 500 lb in | 56.49241451 N m |
| 1,000 lb in | 112.984829 N m |
Reverse conversion: Newton meter to Pound-inch
0.112984829 N m × 8.850745791 = 0.9999999998 lb in
0.112984829 newton meters = 0.9999999998 pound-inches.
pound-inches = newton meters × 8.85074579133
For a page dedicated to this direction, see Newton meter to Pound-inch.
Understanding the Pound-inch (lb in)
Torque from one pound-force at one inch.
Understanding the Newton meter
Newton meter (N m) measures torque. The newton-meter is the SI derived unit of torque: one newton of force applied at one meter of leverage. It is classified as a SI derived unit.
Where it's used: Standard scientific and automotive torque unit worldwide except the US
Uses of the Newton meter today
- Torque wrench specifications (bolt tightening) outside the US
- Engine torque specifications internationally
- Mechanical and structural engineering
History of the Newton meter
As a coherent SI derived unit, the newton-meter follows automatically from the newton and meter, without an independent historical origin — though it is numerically identical in form to the joule (energy), the two are conventionally kept distinct because torque and energy are physically different quantities.
Historical origin. Newton meter was not the invention of a single named person; it developed through the process described above.
Newton meter — sources
- BIPM SI Brochure — Coherent derived units — Defines the newton-meter as the SI unit of torque.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many newton meters are in 1 pound-inch?
1 pound-inch equals 0.112984829 newton meters, using the exact defined conversion factor rather than an estimate.
How do I convert pound-inch to newton meter?
Multiply the pound-inch value by 0.112984829. The converter above does this instantly to whatever precision you set.
How do I convert newton meter back to pound-inch?
Use the reverse factor: 1 newton meter equals 8.850745791 pound-inches. You can also use the swap control in the converter above to flip the direction instantly.
What is a pound-inch?
Pound-inch (lb in) is a unit of engineering.
What is a newton meter?
Newton meter (N m) measures torque. The newton-meter is the SI derived unit of torque: one newton of force applied at one meter of leverage. It is classified as a SI derived unit.
Is the pound-inch to newton meter conversion exact?
Yes. Both pound-inch and newton meter are defined by fixed standards rather than physical artifacts, so the factor of 0.112984829 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.