Nm to ft-lbs Converter
Enter a torque value in newton-meters (Nm) or foot-pounds (ft-lbs) and get an instant bidirectional conversion. The result also shows inch-pounds and kilogram-force meters. Use the common torque reference table below for automotive and mechanical applications.
Formula
Worked example
To convert 100 Nm to ft-lbs: 100 × 0.7376 = 73.76 ft-lbs, which is 885.1 in-lbs and 10.20 kgf-m. To reverse: 73.76 ft-lbs × 1.3558 = 100.0 Nm.
How to convert Nm to ft-lbs
To convert newton-meters to foot-pounds, multiply by the factor 0.73756 (exact: 0.7375621493). So 100 Nm equals 73.76 ft-lbs, 200 Nm equals 147.51 ft-lbs, and 50 Nm equals 36.88 ft-lbs. To go the other direction and convert ft-lbs to Nm, multiply by 1.35582 (exact: 1.3558179483). For example, 80 ft-lbs equals 108.47 Nm. These factors come directly from the SI definition: 1 foot = 0.3048 m exactly and 1 pound-force = 4.44822 N exactly, giving 1 ft-lbf = 0.3048 m × 4.44822 N = 1.35582 N-m.
Nm vs ft-lbs: which unit does your application use?
European and Japanese vehicle manufacturers almost universally publish torque specifications in newton-meters (Nm), the SI standard. Most North American manufacturers, and older service manuals worldwide, use foot-pounds (ft-lbs). Inch-pounds (in-lbs) are common for smaller fasteners: one foot-pound equals exactly 12 inch-pounds, so they are easy to convert mentally. Kilogram-force meters (kgf-m) appear in older European and Japanese manuals from before SI adoption became widespread: 1 kgf-m equals 9.80665 Nm. When in doubt, check which unit the torque wrench or adapter is calibrated in before you start, using the wrong unit is one of the most common causes of over-torquing fasteners.
Why torque precision matters for safety-critical fasteners
Torque is force multiplied by distance. When you tighten a bolt with a torque wrench set to a specific value, you are stretching the bolt shaft a precisely controlled amount, creating the clamping force that keeps a joint together under vibration and load. Under-torquing leaves a fastener loose, which can lead to fatigue failure or loss of parts. Over-torquing can yield (permanently stretch) or snap the bolt, strip threads, or warp mating surfaces. On safety-critical joints such as wheel lug nuts, brake caliper bolts, suspension components, and cylinder head bolts, the specified torque is not a suggestion. Always verify the exact specification in the OEM service manual for your specific vehicle make, model, year, and engine.
Practical tips for torque conversions
A quick mental approximation is that 1 Nm is roughly three-quarters of a ft-lb (0.738 to be precise). This means 100 Nm is roughly 74 ft-lbs, and 200 Nm is roughly 148 ft-lbs. For inch-pounds, multiply the Nm value by about 8.85, so 25 Nm is roughly 221 in-lbs. For kgf-m, divide Nm by about 9.8, so 100 Nm is about 10.2 kgf-m. These rough conversions are useful for a sanity check when reading a foreign service manual or working with mixed-unit tooling. For safety-critical fasteners, always use the precise values from a calculator or printed conversion chart rather than a mental estimate.
Common torque specifications
| Application | Nm | ft-lbs | in-lbs |
|---|---|---|---|
| Fine screws and electronics | 0.5-2 | 0.4-1.5 | 4-18 |
| Spark plugs (petrol engine) | 20-30 | 15-22 | 177-266 |
| Oil drain plug | 25-35 | 18-26 | 221-310 |
| Brake caliper bolts | 35-45 | 26-33 | 310-398 |
| Cylinder head bolts (small engine) | 50-70 | 37-52 | 443-620 |
| Wheel lug nuts (compact car) | 80-110 | 59-81 | 708-974 |
| Wheel lug nuts (SUV/truck) | 120-150 | 89-111 | 1,062-1,328 |
| Cylinder head bolts (passenger car) | 80-110 | 59-81 | 708-974 |
| Axle/hub nut | 150-300 | 111-221 | 1,328-2,655 |
| Driveshaft bolts | 200-260 | 148-192 | 1,771-2,302 |
| Flywheel/flexplate bolts | 60-90 | 44-66 | 531-797 |
Typical torque ranges for automotive and mechanical applications. Always verify exact values with the OEM service manual for your specific vehicle or equipment.
Frequently asked questions
How many ft-lbs is 100 Nm?
100 Nm equals 73.756 ft-lbs. Multiply any Nm value by 0.7376 to get ft-lbs. So 100 × 0.7376 = 73.756 ft-lbs. This is a common reference point for wheel lug nuts on compact cars, which are often specified around 80-110 Nm (59-81 ft-lbs).
How many Nm is 1 ft-lb?
1 ft-lb equals 1.3558 Nm (exact: 1.3558179483 Nm). This comes from the SI definitions: 1 foot = 0.3048 m and 1 pound-force = 4.44822 N, so 1 ft-lbf = 0.3048 × 4.44822 = 1.35582 N-m.
What is the difference between ft-lbs and in-lbs?
1 foot-pound (ft-lb) equals exactly 12 inch-pounds (in-lbs). Foot-pounds are used for larger fasteners such as wheel lug nuts and engine bolts, while inch-pounds are used for smaller fasteners where the torque values would otherwise be a fraction of a foot-pound. For example, spark plug specs are often given as 20-30 Nm (15-22 ft-lbs or 177-266 in-lbs).
How many ft-lbs is 200 Nm?
200 Nm equals 147.51 ft-lbs. Multiply 200 by 0.7376 to get 147.51. This torque range is typical for larger SUV and truck lug nuts, some axle nuts, and high-performance engine fasteners.
What is kgf-m and how does it relate to Nm?
Kilogram-force meter (kgf-m) is an older non-SI unit of torque used in European and Japanese service manuals before the adoption of the newton-meter. 1 kgf-m equals 9.80665 Nm (based on standard gravity). To convert kgf-m to Nm, multiply by 9.80665. To convert Nm to kgf-m, divide by 9.80665. For example, 10 kgf-m = 98.07 Nm.
Is it safe to round a torque conversion?
For most workshop use, rounding to 2-3 decimal places is fine. A torque wrench typically has a mechanical accuracy of plus or minus 4 percent, so splitting hairs beyond the third decimal is not meaningful in practice. For safety-critical fasteners, follow the exact specification in the service manual regardless of unit, and calibrate your torque wrench regularly.
How many ft-lbs for wheel lug nuts?
It depends on the vehicle. Compact and economy cars typically specify 80-110 Nm (59-81 ft-lbs). Mid-size sedans and crossovers commonly call for 100-120 Nm (74-89 ft-lbs). Full-size SUVs and trucks often require 120-150 Nm (89-111 ft-lbs). Heavy-duty pickup trucks may call for 140-165 ft-lbs (190-224 Nm) or more. Always check the sticker inside the driver door jamb or the vehicle service manual for the exact value for your vehicle.