Nm to ft-lbs Converter
Torque specs in newton meters, wrench marked in foot-pounds? Multiply Nm by 0.737562 — this converter does it exactly and shows the inch-pound equivalent too.
Example: with Torque (Nm) 100 → Foot-pounds: 73.76 ft-lb.
Computed by the calculator below using its default values. Change any input to see your own numbers.
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Check it outNewton meters to foot pounds
One foot-pound is defined as 1.355818 Nm, so to convert Nm to ft-lbs you multiply by 0.737562 (or divide by 1.355818). The default 100 Nm — a common caliper-bracket or driveshaft spec — is 100 × 0.737562 = 73.76 ft-lb.
Values mechanics look up constantly: 12 Nm = 8.85 ft-lb (many valve-cover bolts), 25 Nm = 18.44 ft-lb (spark plugs are typically 20–30 Nm), and 140 Nm = 103.26 ft-lb — squarely in the 90–110 ft-lb range most passenger-car lug nuts call for. A quick shop shortcut is “ft-lb ≈ three-quarters of Nm,” which overshoots by only 1.7% — fine for a sanity check, but set the wrench with the exact figure.
How it’s calculated
Foot-pounds = newton meters ÷ 1.3558179483 (equivalently × 0.7375621493). The constant is exact by definition: 1 ft·lbf = 0.3048 m × 4.4482216152605 N (NIST SP 811). Inch-pounds are foot-pounds × 12.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Common mistakes
- Multiplying by 1.3558 instead of 0.7376 — that converts the wrong direction and overshoots torque by 84%.
- Mixing up ft-lb and in-lb — they differ by 12×, and small-fastener specs are often written in in-lb.
- Relying on the ¾ rule of thumb for critical fasteners — it runs about 1.7% high; use the exact conversion.
Frequently asked questions
How do I convert Nm to ft-lbs?
Multiply newton meters by 0.737562 (or divide by 1.355818). For example, 50 Nm × 0.737562 = 36.88 ft-lb.
What is 100 Nm in ft-lbs?
100 Nm = 73.76 ft-lb. Multiply any Nm figure by 0.737562 to get foot-pounds.
How do I convert ft-lbs back to Nm?
Multiply foot-pounds by 1.355818. A 100 ft-lb spec equals 135.58 Nm.
Are Nm and ft-lb measuring the same thing?
Yes — both are torque (force × lever arm). Nm is the SI unit (newtons × meters); ft-lb is the US customary unit (pounds-force × feet). Only the scale differs.