How to Convert Torque Online: Newton-Metres, Pound-Feet and Pound-Inches Explained

You can convert torque online for free in seconds: open the Torque Converter, enter the value, choose the unit it is written in and the unit you need. A wheel-nut setting of 120 Nm, for example, becomes 88.5 lb-ft or 1,062 lb-in, because one pound-foot equals 1.35582 Nm. The converter holds those factors exactly, so a manual written in one unit and a wrench marked in another stop being a problem.

Torque is one of those quantities that most people meet through a single practical moment: a wheel changed at the roadside, a bicycle part fitted at home, an engine bolt tightened in a workshop. In each case the number matters in both directions. Too little tightening torque and the fastener can work loose under vibration. Too much and the bolt stretches, the thread strips, or a carbon or alloy part cracks. The figure in the manual is therefore not a suggestion, and getting it right starts with reading it in the unit the writer intended. That sounds trivial until you notice how often the two sides of the job disagree: a European car manual in Newton-metres beside a North American wrench in pound-feet, a Taiwanese bicycle component leaflet in Newton-centimetres beside a home mechanic whose wrench reads pound-inches. This guide covers only the four units the converter handles — Newton-metres, Newton-centimetres, pound-feet and pound-inches — explains what each one actually measures, shows the conversion factors with fully worked examples, and separates torque from power, the distinction that causes the deepest confusion of all.

How Do You Convert Torque Online, Step by Step?

1. Open the converter. Go to the Torque Converter and keep the manual, label or specification that gave you the figure open beside it.
2. Enter the number exactly as written. Copy the value before you interpret it. A setting of 120 is a completely different instruction depending on the letters that follow it.
3. Select the unit the figure is written in. Newton-metres on most European and Japanese specifications, pound-feet on most North American workshop material, Newton-centimetres or pound-inches for small fasteners and delicate parts.
4. Select the unit your wrench or gauge uses. The answer appears in that unit, ready to set. If your wrench offers both scales, prefer setting it directly in the unit of the specification and skip conversion altogether.
5. Round sensibly, then sanity-check the size. The pound-foot figure should always be smaller than the Newton-metre figure for the same torque, roughly three quarters of it. If your converted answer is larger than the number you started with, a unit has been swapped somewhere.

What Torque Actually Is, in Plain Language

Torque is twisting effort: a force applied at a distance from a pivot, tending to rotate whatever it acts on. Push on a door near its handle and it swings easily; push near the hinge and the same push barely moves it. The force is identical, the distance from the pivot is not, and torque is the quantity that captures that difference. Formally, torque equals force multiplied by the perpendicular distance from the pivot — which is why every torque unit is a force unit married to a length unit: Newtons times metres, pounds-force times feet, pounds-force times inches. A setting of 120 Nm is, in physical terms, the twisting effect of a 120-newton force acting one metre from the centre of rotation, or an equivalent combination such as 240 newtons at half a metre.

That picture also explains why torque wrenches are long. The handle length is the distance term built into the tool, and the wrench is calibrated so that the force your hand applies at the grip produces the stated torque at the socket. It also explains a workshop habit worth copying: pull steadily at the middle of the grip, never with an extension pipe slipped over the handle, because changing the effective geometry or jerking the pull changes the torque actually delivered. The converter cannot help with technique, but it can make sure the number you are aiming at is the right one in the first place.

The Four Units and the Exact Conversion Factors

Two families meet in this converter. The metric family builds on the Newton-metre, with the Newton-centimetre as its smaller sibling for delicate work: there are exactly 100 Ncm in 1 Nm, by the definition of centi. The imperial family builds on the pound-foot, with the pound-inch below it: there are exactly 12 lb-in in 1 lb-ft, by the definition of the foot. Across the families, the bridge factors are 1 lb-ft = 1.35582 Nm and its reciprocal, 1 Nm = 0.73756 lb-ft. From those two numbers every other factor in the table follows: 1 Nm = 100 Ncm exactly, and 1 Nm = 8.8507 lb-in, which you can verify by combining the bridges — 0.73756 lb-ft, times 12 inches per foot, gives 8.8507 lb-in.

Conversion	Factor	Worked check
Pound-feet to Newton-metres	Multiply by 1.35582	50 lb-ft × 1.35582 = 67.79 Nm
Newton-metres to pound-feet	Multiply by 0.73756	120 Nm × 0.73756 = 88.5 lb-ft
Newton-metres to Newton-centimetres	Multiply by 100	2.5 Nm = 250 Ncm
Newton-metres to pound-inches	Multiply by 8.8507	120 Nm × 8.8507 = 1,062 lb-in
Pound-feet to pound-inches	Multiply by 12	88.5 lb-ft = 1,062 lb-in

Read the table in the direction of the check you need and notice how the worked examples cross-verify each other. The wheel-nut figure of 120 Nm arrives at 1,062 lb-in by two independent routes — directly from Newton-metres, and via pound-feet multiplied by 12 — and both routes agree. That agreement is the habit to build: any conversion that matters deserves a second route, even a rough one, because the errors that hurt are never in the fifth decimal place. They are in the swapped unit, the misread scale and the factor applied upside down, and a second route catches all three.

Worked Examples With the Arithmetic Shown

Example 1 — the wheel nut. A manual specifies 120 Nm and the wrench in the boot is marked in pound-feet. Multiply by the bridge factor: 120 × 0.73756 = 88.507, which rounds to 88.5 lb-ft. On a pound-inch wrench the same job reads 120 × 8.8507 = 1,062 lb-in. Set the wrench, tighten in the star pattern the manual describes, and the job is done to specification rather than to feel.

Example 2 — the older workshop manual. A specification written for the North American market gives 50 lb-ft for a bracket, and your newer wrench reads Newton-metres. This time multiply by 1.35582: 50 × 1.35582 = 67.79 Nm, which you would set as 68 Nm on a wrench with whole-number markings — a rounding of about a third of one percent, well inside the tolerance of any real fastener.

Example 3 — the small fastener. A bicycle component leaflet specifies 500 Ncm for a clamp. In Newton-metres that is 500 ÷ 100 = 5 Nm, and in pound-inches 5 × 8.8507 = 44.3 lb-in. Written as pound-feet it would be 3.7 lb-ft — a clumsy, easily misread figure, which is exactly why the smaller units exist.

The chart compares the four worked values on one scale, and its lesson is about proportion rather than any single number. The wheel-nut setting is twelve times the smallest value shown, yet all four sit comfortably inside the range a single mid-sized torque wrench covers. That is unusual among physical quantities — a converter for lengths or weights routinely spans numbers thousands of times apart — and it is why torque mistakes are so often about units rather than magnitudes. The values live close together, the units differ by factors like 12 and 100, and a figure that looks plausible can still be out by exactly one of those factors.

Which Unit Will You Meet Where?

Situation	Unit you will usually see	Why, and what to watch for
Car wheel nuts and engine work, European or Japanese manual	Newton-metres	Metric specification is standard; convert only if your wrench is imperial
Car and workshop work, North American manual	Pound-feet	The long-standing US workshop unit; figures run about three quarters of the Nm value
Bicycle components and small clamps	Newton-centimetres or Newton-metres	Small settings need small units; check whether the leaflet means Ncm before assuming Nm — the difference is a factor of 100
Small fasteners, electronics, model engineering	Pound-inches	Settings far below one pound-foot; a lb-ft wrench cannot even register them accurately
Industrial and engineering documents	Newton-metres	The SI unit, used in calculations and standards worldwide

Torque Is Not Power: The Distinction That Matters

Torque and power are constantly confused because engines are described with both, often in the same sentence. They are different quantities. Torque is the twisting effort itself, available the instant a force acts on a lever. Power is a rate: how much work gets done per unit of time. A mechanic leaning on a long wrench applies real torque while delivering almost no power, because nothing is moving quickly. A small electric motor spinning at high speed can deliver substantial power with modest torque, because it applies that torque thousands of times per minute. For a rotating shaft the relationship is direct: power grows with torque multiplied by rotational speed, which is why an engine specification quotes a torque figure, a power figure, and the speeds at which each peaks — and why neither figure can be converted into the other without knowing the speed. When you need the power side of the picture, in watts, kilowatts or horsepower, the separate power converter handles that conversion; torque figures never belong in it, and power figures never belong in this one.

Five Mistakes That Spoil Torque Conversions

• Reading Ncm as Nm. The most expensive slip available here: a factor of 100. A clamp specified at 500 Ncm tightened to 500 Nm would be destroyed instantly. Read every letter of the unit, every time, especially on component leaflets printed in small type.
• Applying the bridge factor upside down. Multiplying Newton-metres by 1.35582 instead of 0.73756 produces a pound-foot figure that is too large and too plausible-looking. The check is built in: the lb-ft number must be smaller than the Nm number. If it is not, the factor went the wrong way.
• Confusing pound-feet with foot-pounds in energy contexts. Workshop speech uses the two orderings loosely, and for torque settings they refer to the same practical unit. Trouble starts when a figure from an energy context — muzzle energy, for instance — is treated as a tightening torque. Same-looking words, different physical quantity.
• Rounding a small setting too aggressively. Rounding 67.79 Nm to 68 Nm is harmless. Rounding 44.3 lb-in to 45 is a larger relative change, and rounding 4.4 lb-in to 4 or 5 changes the setting by more than ten percent either way. The smaller the setting, the more decimal places deserve to survive.
• Treating a converted figure as permission to exceed it. A torque specification is a value, sometimes with a stated tolerance or a range — never a minimum to beat for safety. Tightening beyond specification does not add security; it adds bolt stretch, thread damage and, on wheel fixings, distorted brake discs.

Conclusion: Read the Unit, Then Trust the Number

Every reliable torque conversion rests on three habits: read the complete unit, including the centi and the inch hiding inside the small ones; apply the bridge factors in the direction where pound-feet come out smaller than Newton-metres; and cross-check any important setting by a second route, the way 120 Nm reaches 1,062 lb-in both directly and through pound-feet. The four factors worth remembering are 1 lb-ft = 1.35582 Nm, 1 Nm = 0.73756 lb-ft, 1 Nm = 100 Ncm and 1 Nm = 8.8507 lb-in — everything else in this guide is those numbers at work. Two companion guides cover the conversions that sit closest to this one in workshop life: our guide to converting weight units online for the masses stamped on components and luggage alike, and our guide to converting volume units online for the fluids — oil, coolant, fuel — that workshop jobs consume. The force converter is the other close relative, for the force half of the force-times-distance definition itself.

Frequently Asked Questions

How many pound-feet is 120 Nm?

120 Nm = 88.5 lb-ft. The working is 120 × 0.73756 = 88.5, rounded to one decimal place. In pound-inches the same setting is 120 × 8.8507 = 1,062 lb-in.

Which is bigger, a Newton-metre or a pound-foot?

A pound-foot is bigger. One pound-foot equals 1.35582 Newton-metres, so the same physical torque always carries a smaller number in pound-feet than it does in Newton-metres.

Is torque the same thing as power?

No. Torque is a twisting force, measured in Newton-metres or pound-feet. Power is the rate at which work is done, measured in watts or horsepower. An engine produces torque; how fast that torque is delivered at a given speed is what turns it into power.

Why do small fasteners use pound-inches or Newton-centimetres instead of pound-feet?

Because their settings are far below one pound-foot. A trim screw or bicycle stem bolt tightened to a few pound-feet of torque would be destroyed. Pound-inches and Newton-centimetres give those small settings whole, readable numbers.

Is a Newton-metre the same as a joule?

The units share the same dimensions, but they describe different things. A joule measures energy or work done. A Newton-metre of torque measures twisting effort. Using the same letters for both is a long-standing source of confusion, which is why careful writers keep the context explicit.

How do I convert Newton-centimetres to Newton-metres?

Divide by 100. There are exactly 100 Newton-centimetres in one Newton-metre, so 250 Ncm is 2.5 Nm, and 2.5 Nm is 22.1 lb-in.

Which unit should I set on my torque wrench?

The unit printed in the manual or specification for the job in front of you. If the manual says 120 Nm, set 120 Nm. Converting introduces a rounding step and a chance to misread, so convert only when the wrench and the specification genuinely use different units.