Newton meter is the SI torque unit.
Newton meters to Pound-inches Converter — N m to lb in
Convert Newton meter (N m) to Pound-inch (lb in) using the exact conversion factor (1 newton meter = 8.850745791 pound-inch). See the formula, worked examples, conversion table, history, and common uses.
Newton meters to Pound-inches 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.
Torque from one pound-force at one inch.
Result = input x 1 / 0.112984829.
Torque units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Newton meters to Pound-inches
Newton meter and Pound-inch 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. Newton meter is most often used for torque wrench specifications (bolt tightening) outside the us.
Formula
pound-inches = newton meters × 8.85074579133
This factor comes from each unit's defined relationship to the category's base unit: 1 newton meter equals 1 base unit, and 1 pound-inch equals 0.112984829028 base units, so dividing one by the other gives the direct newton meter-to-pound-inch factor of 8.85074579133.
Simple example
1 N m × 8.850745791 = 8.850745791 lb in
1 newton meter = 8.850745791 pound-inches.
Real-world example
100 N m × 8.850745791 = 885.0745791 lb in
100 newton meters = 885.0745791 pound-inches.
Conversion table
| Newton meter (N m) | Pound-inch (lb in) |
|---|---|
| 1 N m | 8.850745791 lb in |
| 10 N m | 88.50745791 lb in |
| 50 N m | 442.5372896 lb in |
| 100 N m | 885.0745791 lb in |
| 500 N m | 4,425.372896 lb in |
| 1,000 N m | 8,850.745791 lb in |
Reverse conversion: Pound-inch to Newton meter
8.850745791 lb in × 0.112984829 = 1 N m
8.850745791 pound-inches = 1 newton meters.
newton meters = pound-inches × 0.112984829028
For a page dedicated to this direction, see Pound-inch to Newton meter.
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.
Understanding the Pound-inch (lb in)
Torque from one pound-force at one inch.
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 pound-inches are in 1 newton meter?
1 newton meter equals 8.850745791 pound-inches, using the exact defined conversion factor rather than an estimate.
How do I convert newton meter to pound-inch?
Multiply the newton meter value by 8.850745791. The converter above does this instantly to whatever precision you set.
How do I convert pound-inch back to newton meter?
Use the reverse factor: 1 pound-inch equals 0.112984829 newton meters. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a pound-inch?
Pound-inch (lb in) is a unit of engineering.
Is the newton meter to pound-inch conversion exact?
Yes. Both newton meter and pound-inch are defined by fixed standards rather than physical artifacts, so the factor of 8.850745791 used above is exact to as many digits as you choose to display.
Where is the newton meter still used today?
Standard scientific and automotive torque unit worldwide except the US
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.