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.