Type in either box — the other updates instantly. 100 N·m = 73.8 ft·lbs.
ft·lbs = N·m × 0.7375621 · N·m = ft·lbs × 1.3558179
Both units measure the same physical quantity — a force applied at a distance. A newton-metre is one newton acting one metre from the axis; a foot-pound is one pound-force acting one foot from it. The conversion factor comes straight from those definitions: 1 lbf = 4.448222 N and 1 ft = 0.3048 m, so 1 ft·lb = 4.448222 × 0.3048 = 1.3558179 N·m.
For mental maths, multiply N·m by 0.75 and subtract a hair. 100 N·m → about 75, actual 73.8. 200 N·m → about 150, actual 147.5. Going the other way, multiply ft·lbs by 1.35.
Do not confuse ft·lbs with in·lbs. Small fasteners are often specified in inch-pounds, which are twelve times smaller. If a spec reads 90 and the bolt is finger-sized, it is almost certainly in·lbs — see the inch-pounds to foot-pounds converter.
| N·m | ft·lbs |
|---|---|
| 1 | 0.74 |
| 5 | 3.69 |
| 10 | 7.38 |
| 15 | 11.06 |
| 20 | 14.75 |
| 25 | 18.44 |
| 30 | 22.13 |
| 35 | 25.81 |
| 40 | 29.5 |
| 45 | 33.19 |
| 50 | 36.88 |
| 60 | 44.25 |
| 70 | 51.63 |
| 75 | 55.32 |
| 80 | 59 |
| 90 | 66.38 |
| 100 | 73.76 |
| 110 | 81.13 |
| 120 | 88.51 |
| 130 | 95.88 |
| 140 | 103.26 |
| 150 | 110.63 |
| 175 | 129.07 |
| 200 | 147.51 |
| 225 | 165.95 |
| 250 | 184.39 |
| 300 | 221.27 |
| 350 | 258.15 |
| 400 | 295.02 |
| 450 | 331.9 |
| 500 | 368.78 |
| ft·lbs | N·m |
|---|---|
| 5 | 6.78 |
| 10 | 13.56 |
| 15 | 20.34 |
| 20 | 27.12 |
| 25 | 33.9 |
| 30 | 40.67 |
| 40 | 54.23 |
| 50 | 67.79 |
| 60 | 81.35 |
| 70 | 94.91 |
| 75 | 101.69 |
| 80 | 108.47 |
| 90 | 122.02 |
| 100 | 135.58 |
| 110 | 149.14 |
| 120 | 162.7 |
| 130 | 176.26 |
| 150 | 203.37 |
| 165 | 223.71 |
| 200 | 271.16 |
| 250 | 338.95 |
| 300 | 406.75 |
| Fastener | N·m | ft·lbs |
|---|---|---|
| Spark plug, 14 mm | 25 | 18.4 |
| Oil drain plug, M14 | 35 | 25.8 |
| M10 class 8.8 bolt | 50 | 36.9 |
| Passenger-car lug nut | 103 | 76 |
| Full-size truck lug nut | 203 | 150 |
Multiply the newton-metre figure by 0.7375621. Formula: ft·lbs = N·m × 0.7375621. Examples: 50 N·m = 36.9 ft·lbs; 100 N·m = 73.8 ft·lbs; 200 N·m = 147.5 ft·lbs.
100 N·m = 73.8 ft·lbs. That is a typical figure for a passenger-car lug nut or a mid-size engine bracket bolt.
1 N·m = 0.73756 ft·lbs. Going the other way, 1 ft·lb = 1.35582 N·m.
Multiply foot-pounds by 1.3558179. Formula: N·m = ft·lbs × 1.3558179. Example: 80 ft·lbs = 108.5 N·m.
No — a newton-metre is the smaller unit. One foot-pound equals about 1.36 newton-metres, so any torque figure is a larger number when written in N·m than in ft·lbs.
Multiply by 0.7375621, or divide by 1.3558. 50 N·m is 36.9 ft·lbs, 120 N·m is 88.5 ft·lbs and 250 N·m is 184.4 ft·lbs. A fast estimate is three quarters of the N·m figure: 200 N·m → about 150 ft·lbs (exact 147.5).
Metric service manuals, VDI 2230 calculations and the metric bolt tables on this site are all in N·m, so this is the conversion to use when your wrench reads in ft·lbs.