How to Convert Nm to Ft Lbs (Torque Conversion Made Simple)
By Shihab Mia July 11, 2026 6 min read
Quick answer
To convert newton metres to pound-feet, multiply the Nm value by 0.73756. So 1 Nm = 0.73756 ft lb, and 100 Nm = 73.76 ft lb. To go the other way, multiply ft lb by 1.35582 to get Nm.
Torque is the twisting force you apply when you turn a wrench, tighten a bolt, or spin an engine crankshaft. Two units dominate the world of torque: the newton metre (Nm), used almost everywhere outside the United States, and the pound-foot (ft lb), standard in American workshops and on many spec sheets. If your torque wrench reads in one unit but your manual lists the other, you need a fast, reliable way to switch between them. The good news is that the conversion is a single multiplication you can do in your head or on any calculator.
The Nm to ft lbs formula
The conversion rests on two fixed factors that never change:
- Nm to ft lb: multiply by 0.73756
- ft lb to Nm: multiply by 1.35582
These two numbers are reciprocals of each other (0.73756 x 1.35582 is approximately 1), so you only need to remember one and you can always recover the other. For quick mental math, 0.74 is close enough for most rough estimates, but use the full 0.73756 when a spec sheet demands precision.
Written as a formula: ft lb = Nm x 0.73756. That is the whole method. Everything else in this guide is about applying it correctly and avoiding the small mistakes that trip people up.
Worked example: convert 100 Nm to ft lbs
Say your service manual specifies a bolt at 100 Nm but your torque wrench is calibrated in pound-feet. Here is how to get the number you need.
- Start with your torque value in newton metres: 100 Nm.
- Multiply by the conversion factor: 100 x 0.73756.
- Read the result: 73.756 ft lb.
- Round sensibly for the tool you are using: 73.8 ft lb, or 74 ft lb if your wrench only marks whole numbers.
That is it. Set your wrench to roughly 74 ft lb and you have matched the 100 Nm specification. The same three-step method works for any value: swap in your own number, multiply, and round to match your tool's smallest increment.
Nm to ft lbs conversion chart
Use this reference table for common torque values. Each pound-foot figure is the newton metre value multiplied by 0.73756 and rounded to two decimals.
Common newton metre to pound-foot conversions
| Newton metres (Nm) | Pound-feet (ft lb) |
|---|---|
| 1 Nm | 0.74 ft lb |
| 5 Nm | 3.69 ft lb |
| 10 Nm | 7.38 ft lb |
| 20 Nm | 14.75 ft lb |
| 25 Nm | 18.44 ft lb |
| 40 Nm | 29.50 ft lb |
| 50 Nm | 36.88 ft lb |
| 75 Nm | 55.32 ft lb |
| 100 Nm | 73.76 ft lb |
| 150 Nm | 110.63 ft lb |
| 200 Nm | 147.51 ft lb |
| 250 Nm | 184.39 ft lb |
Why torque uses two different units
The newton metre is the metric (SI) unit of torque: one newton of force applied at the end of a one-metre lever arm. The pound-foot is the imperial equivalent: one pound of force at the end of a one-foot lever. Because the metre is longer than the foot and the kilogram-based newton differs from the pound-force, the two units land on different numbers for the same physical twist, which is exactly why you need a conversion factor.
Which unit you meet depends on where the equipment was designed. European and Japanese vehicles, most modern service manuals, and nearly all scientific and engineering documentation quote torque in newton metres. American cars, older domestic machinery, and a lot of hardware sold in the United States still list pound-feet. Digital torque wrenches usually let you switch units on the fly, but click-type mechanical wrenches are marked in one system only, so knowing the conversion by heart saves you from setting a fastener wrong when the manual and the tool disagree.
It also helps to picture the scale. A snug interior trim screw might call for just 2 to 5 Nm (under 4 ft lb), a typical wheel lug nut lands around 110 to 140 Nm (81 to 103 ft lb), and a large suspension or driveshaft bolt can exceed 250 Nm (184 ft lb). Building this rough map in your head means a converted number that lands far outside the expected range is an instant signal that you multiplied by the wrong factor or misread a decimal point.
Torque is closely related to other rotational and mechanical quantities. If you enjoy seeing how force turns into motion and effort, the work formula and the power formula explain how twisting force connects to energy transfer and the rate of doing work. Torque is what gets a bolt moving; work and power describe what happens once it does.
Torque vs foot-pounds of energy: an important distinction
Torque measured in pound-feet is a twisting force, and it is physically different from foot-pounds of energy even though the number looks identical. A pound-foot of torque describes a rotational effort around an axis; a foot-pound of energy describes work done when a force moves an object over a distance. Engineers often write torque as lb ft and energy as ft lb to keep them apart, but real-world usage is inconsistent, so context matters.
The practical takeaway: when you are tightening fasteners or reading engine specs, you are dealing with torque, not energy. Do not let the shared unit name confuse you into applying energy formulas to a torque value.
Common mistakes to avoid
- Multiplying by the wrong factor. Nm to ft lb uses 0.73756 (the smaller number, since ft lb values are smaller). If your answer came out bigger than the Nm value, you multiplied by 1.35582 by mistake.
- Confusing torque with energy. A pound-foot of torque is not a foot-pound of work. Same number, different physics.
- Over-rounding on precision jobs. Using 0.74 instead of 0.73756 is fine for a rough estimate but can drift off spec on high-torque fasteners. Use the full factor when it matters.
- Mixing up inch-pounds and foot-pounds. Small fasteners are often specified in inch-pounds (in lb). There are 12 in lb in 1 ft lb, so do not read an inch-pound spec as a foot-pound one.
- Ignoring your wrench's range. A conversion is only useful if your tool can actually reach the target. Check that the converted value falls inside your wrench's calibrated range.
Good to know: quick estimation tricks
For fast field estimates without a calculator, remember that Nm values are roughly three-quarters of themselves in ft lb. A handy shortcut: take the Nm number, subtract about a quarter of it, and you are close. For example, 80 Nm minus a quarter (20) gives 60, and the exact answer is 59 ft lb. Going the other way, ft lb values are roughly one-third larger in Nm, so add about a third.
If you convert torque often, it is worth bookmarking a dedicated tool so you never second-guess the factor. For other everyday unit switches, the same principle applies to a length converter or a weight converter: learn the factor once, then let a calculator handle the arithmetic. And if you like understanding the physics behind the numbers, the momentum formula rounds out the picture of how forces act on moving objects.
Convert Nm to ft lbs instantly
Skip the mental math and let the tool below do the multiplication for you. Enter any newton metre value and get the exact pound-foot result, accurate to the full 0.73756 factor, ready to dial into your torque wrench.
🔧 Try the free tool Nm to Ft-Lbs Converter Free Nm to ft lbs converter changes newton metres to pound-feet torque instantly, both ways. Enter any value, see the exact result, plus a full reference table.Converting between newton metres and pound-feet comes down to one factor you now know by heart: multiply Nm by 0.73756 to get ft lb, or ft lb by 1.35582 to get Nm. Keep the conversion chart handy, respect the difference between torque and energy, and always round to match your wrench. With those habits, you will match any torque spec correctly no matter which unit the manual uses.