To convert newton-meters to inch-pounds (N·m to in·lb), multiply by 8.8507458. 1 newton-meter equals 8.8507458 in·lb.
| newton-meters | inch-pounds |
|---|---|
| 1 newton-meter | 8.8507458 in·lb |
| 2 newton-meters | 17.701492 in·lb |
| 5 newton-meters | 44.253729 in·lb |
| 10 newton-meters | 88.507458 in·lb |
| 25 newton-meters | 221.26864 in·lb |
| 50 newton-meters | 442.53729 in·lb |
| 100 newton-meters | 885.07458 in·lb |
| 250 newton-meters | 2,212.6864 in·lb |
| 500 newton-meters | 4,425.3729 in·lb |
| 1000 newton-meters | 8,850.7458 in·lb |
Definition: The turning force from one newton of force applied at the end of a one-meter lever arm - what you feel when you tighten a bolt with a wrench.
History: Named for Isaac Newton, whose second law of motion underpins the newton itself as a force unit. Pairing it with a meter of leverage gives the SI's standard way to measure torque, the rotational cousin of ordinary force.
Current use: European and Asian car manuals, bicycle component specs, and virtually all modern engineering torque specifications outside the US.
Definition: The turning force from one pound of force applied at the end of a one-inch lever arm - twelve times smaller than a foot-pound, since a foot is twelve inches.
History: It exists for the same reason a ruler has both inches and feet: foot-pounds give clumsy, awkward numbers for small torque values, so mechanics and engineers working on delicate components switched to a shorter lever-arm unit that reads in comfortable whole numbers instead.
Current use: Small fasteners, electronics, bicycle components, and precision assembly. Mixing this up with foot-pounds is a genuinely common and expensive mistake - setting a wrench to the wrong one applies 12 times the intended torque.
The factor is 8.85075, which is derived rather than defined, so any decimal you see has been rounded somewhere.
No simple round multiplier is close enough to be useful, so this is one to look up rather than estimate. The exact factor is 8.85075.
The reverse factor is 0.113, so one inch-pound is that many newton-meters. Two decimal places is plenty for most purposes, and three is more than a tape measure can justify.
To anchor the scale: 1 newton-meter is about 8.85 in·lb.