N·m = kgf·m × 9.80665
N·m = ft·lbf × 1.35582
N·m = in·lbf × 0.112985
Convert torque between Newton-metre (N·m), Kilogram-meter (kgf·m), Foot-pound (ft·lbf), and Inch-pound (in·lbf). Ideal for automotive engineering, mechanical design, bolt tightening, and academic applications. Includes conversion formulas and real-world examples.
| Unit | Full Name | Relation to Newton-metre (N·m) |
|---|---|---|
| N·m | Newton-metre | 1 N·m = 1 N·m |
| kgf·m | Kilogram-meter | 1 kgf·m ≈ 9.80665 N·m |
| ft·lbf | Foot-pound | 1 ft·lbf ≈ 1.35582 N·m |
| in·lbf | Inch-pound | 1 in·lbf ≈ 0.112985 N·m |
An engine produces 300 N·m of torque.
kgf·m: 300 ÷ 9.80665 ≈ 30.6 kgf·m
ft·lbf: 300 × 0.73756 ≈ 221.3 ft·lbf
A bolt requires 40 in·lbf of torque.
N·m: 40 × 0.112985 ≈ 4.52 N·m
ft·lbf: 40 ÷ 12 = 3.33 ft·lbf
1.Automotive engine torque specification — comparing performance across regions
2.Motor and gearbox selection — matching output torque to load requirements
3.Bolt tightening torque setting — ensuring proper clamping force in assemblies
4.Mechanical design and dynamics analysis — calculating forces in rotating systems
5.Academic learning and exams — physics, engineering mechanics, thermodynamics
1.ISO 80000-3: Quantities and units — Space and time
2.SAE J1140: Motor Vehicle Power Rating
3.ASTM E1003: Standard Test Method for Measurement of Torque
4.Textbooks: "Mechanics of Materials" by Ferdinand Beer, "Engineering Mechanics" by Hibbeler
1 N·m ≈ 0.73756 ft·lbf
So, 1 ft·lbf ≈ 1.35582 N·m.
N·m is the SI unit of torque, based on Newtons and meters.
kgf·m uses kilogram-force (a gravitational force), so 1 kgf·m ≈ 9.80665 N·m.
It's commonly used in older European and Asian machinery specs.
Multiply by 0.112985:
N·m = in·lbf × 0.112985
Example: 100 in·lbf × 0.112985 = 11.2985 N·m
Yes! Since 1 foot = 12 inches, 1 ft·lbf = 12 in·lbf.
This is a direct linear relationship, not a conversion factor.
Torque measures the rotational force an engine can produce. Higher torque means better acceleration and pulling power, especially at low speeds. It’s crucial for trucks, tractors, and heavy machinery.
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