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Inch-Pounds to Foot-Pounds Calculator — Torque Converter

Convert any torque value between inch-pounds (in·lb), foot-pounds (ft·lb), Newton-metres (N·m) and ounce-inches (oz·in). The key relationship is exact: 12 inch-pounds = 1 foot-pound, so dividing or multiplying by 12 is all you need.

in·lb

Enter the torque value you want to convert
Foot-pounds (ft·lb)
10

Divide inch-pounds by 12 — exact by definition (12 in·lb = 1 ft·lb)

Inch-pounds (in·lb)
120 in·lb
Foot-pounds (ft·lb)
10 ft·lb
Newton-metres (N·m)
13.558179 N·m
Ounce-inches (oz·in)
1,920 oz·in
017.334.551.86986.3103.5120.8138120 in·lb1 ft·lb2 ft·lbInch-pound value on a scale — every 12 in·lb equals 1 ft·lb
Step by step
  1. 1

    Conversion factor

    1 ft·lb = 12 in·lb → 1 in·lb = 1 ÷ 12 = 0.083333
    Exact by definition — a foot-pound is a pound applied at 12 inches, so it is exactly 12 inch-pounds.
  2. 2

    Foot-pounds

    120 ÷ 12 = 10
Results are estimates for general information only and are not professional advice — always verify important results independently before relying on them. Read the full disclaimer.
Quick answer

How does this calculator work?

Divide inch-pounds by 12 to get foot-pounds (1 ft·lb = 12 in·lb, exact). Multiply by 0.112985 for Newton-metres. Common workshop use: spark plug torque specs are often in ft·lb; small fastener specs in in·lb. Divide by 12, or use this calculator for all four units at once.

Formula
1 ft·lb = 12 in·lb • 1 in·lb = 0.112985 N·m • 1 in·lb = 16 oz·in
How this is calculated

Torque measures rotational force — the tendency to rotate an object around an axis. An inch-pound is the torque produced by a 1-pound force applied at a 1-inch radius; a foot-pound is the same 1-pound force at a 12-inch (1-foot) radius. Because the distance relationship is exactly 12-to-1, converting between the two is a simple division or multiplication by 12 — no rounding, no approximation.

The SI unit Newton-metre is derived from the definition of the pound-force (exactly 0.45359237 kg × 9.80665 m/s²) and the inch (exactly 0.0254 m), giving 1 in·lb = 0.1129848… N·m exactly.

Common use cases: torquing spark plugs or cylinder-head bolts (often specified in ft·lb in workshop manuals), tightening small fasteners in electronics or precision assemblies (often in·lb or oz·in), and comparing published engine torque figures (N·m in Europe, ft·lb in the US).

Frequently asked questions

Divide by 12. For example, 120 in·lb ÷ 12 = 10 ft·lb. To go the other way, multiply foot-pounds by 12 to get inch-pounds.

They are the same unit family — just different scales. Small fasteners (electronics, small engines) are typically specified in in·lb because the values in ft·lb would be fractions like 0.42 ft·lb. Large fasteners (lug nuts, cylinder heads) are given in ft·lb to keep the number manageable.

Multiply ft·lb by 1.35582. For example, 100 ft·lb × 1.35582 ≈ 135.58 N·m. For the reverse, multiply N·m by 0.73756. This calculator starts from inch-pounds and shows N·m directly.

Also known as

inch pounds to foot pounds
in lb to ft lb converter
torque unit conversion
in-lb ft-lb calculator
inch pound conversion
foot pound torque
nm to ft lb calculator
torque wrench unit converter

APA

TG we-Calculate Editorial Team. (2026). Inch-Pounds to Foot-Pounds Calculator — Torque Converter [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/inch-pounds-to-foot-pounds-calculator

Chicago

TG we-Calculate Editorial Team. "Inch-Pounds to Foot-Pounds Calculator — Torque Converter." TG we-Calculate. 2026. https://we-calculate.com/calculator/inch-pounds-to-foot-pounds-calculator.

IEEE

TG we-Calculate Editorial Team, "Inch-Pounds to Foot-Pounds Calculator — Torque Converter," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/inch-pounds-to-foot-pounds-calculator

BibTeX

@misc{wecalculate_inch_pounds_to_foot_pounds_calculator, title = {Inch-Pounds to Foot-Pounds Calculator — Torque Converter}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/inch-pounds-to-foot-pounds-calculator}}, year = {2026}, note = {TG we-Calculate} }

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