Inch-Pounds to Nm Converter

Small fasteners, bicycle components and electrical terminals are torqued in inch-pounds in U.S. manuals and in newton-metres elsewhere. One inch-pound is about 0.113 N·m.

How to use the Inch-Pounds to Nm Converter

1. Type the number of pound-inches into the Pound-inches field. Decimals such as 50 are fine.
2. Read the answer in Newton-metres – it updates as you type, with no button to press.
3. To convert the other way, type into Newton-metres and the pound-inches are recalculated.
4. Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.

This page converts only lbf·in ⇄ N·m. Need a different unit? Use the general torque converter, where you can choose any “from” and “to” unit.

How it works

Both units measure torque, so they are always in the same ratio: one pound-inch equals 0.11298483 newton-metres. The calculator multiplies the number of pound-inches you type by 0.11298483 to give newton-metres, and when you type into the newton-metres field it divides by the same factor to give pound-inches. Because the ratio never changes, doubling the pound-inches always doubles the newton-metres. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).

How to convert pound-inches to newton-metres

1. Write down the value in pound-inches, for example 100 lbf·in.
2. Multiply by the conversion factor 0.11298483 (because 1 pound-inch = 0.11298483 N·m).
3. 100 × 0.11298483 = 11.298483 N·m.
4. To go back from newton-metres to pound-inches, divide by 0.11298483 – or multiply by 8.8507458.

lbf·in to N·m conversion table

What is a pound-inch?

The pound-inch (in-lb) is 1/12 of a pound-foot, about 0.113 N·m, used for small fasteners and electrical terminals.

What is a newton-metre?

The newton-metre is the SI unit of torque: a force of one newton at a lever arm of one metre. Car and bicycle torque specifications use N·m.

Quick mental conversion

For a fast estimate, multiply pound-inches by about 0.11 to get newton-metres; the error is about 2.6%. Use the calculator above when you need the exact figure.

Common mistakes to avoid

Confusing ft-lb with in-lb (a factor of 12), and treating torque in n·m as energy in joules.