Question 1

What units does this converter support?

Accepted Answer

The converter covers 16 units across three systems. SI / Metric: millinewton-meter (mN·m), newton-millimeter (N·mm), newton-centimeter (N·cm), newton-meter (N·m), kilonewton-meter (kN·m), and meganewton-meter (MN·m). Metric Gravitational: gram-force centimeter (gf·cm), kilogram-force centimeter (kgf·cm), kilogram-force meter (kgf·m), and tonne-force meter (tf·m). US Customary / Imperial: ounce-force inch (ozf·in), ounce-force foot (ozf·ft), pound-force inch (lbf·in), pound-force foot (lbf·ft), kilopound-force inch (kip·in), and kilopound-force foot (kip·ft).

Question 2

What is the difference between moment of force and torque?

Accepted Answer

Physically they are the same quantity - both equal force × perpendicular distance and are measured in N·m (or equivalent). In engineering terminology, 'torque' typically refers to the rotational tendency in shafts, engines, and fasteners, while 'moment of force' (or simply 'moment') is more commonly used in statics and structural analysis to describe the bending tendency in beams, frames, and supports. The mathematical conversion between units is identical regardless of which term is used.

Question 3

What are kip·ft and kip·in, and why are they important?

Accepted Answer

A kip (kilopound-force) equals 1,000 pound-force (lbf). Kip·ft (kilopound-force foot) and kip·in (kilopound-force inch) are the standard moment units in US structural engineering codes (AISC, ACI, ASCE). Beam, column, and connection designs in American practice are routinely specified in kip·ft or kip·in rather than lbf·ft because the numbers are smaller and easier to work with for typical structural loads. 1 kip·ft = 1,355.8 N·m = 1.3558 kN·m.

Question 4

What is a tonne-force meter (tf·m)?

Accepted Answer

The tonne-force (tf) is the force exerted by a mass of 1 metric tonne under standard gravity: 1 tf = 1,000 kgf = 9,806.65 N. A tonne-force meter therefore equals 9,806.65 N·m ≈ 7.233 kip·ft. This unit is commonly used in European structural engineering and civil engineering, particularly in load specifications, crane and hoist moment ratings, and bridge design. It is not an SI unit but is widely encountered in European design codes and equipment datasheets.

Question 5

How do I convert between kN·m and kip·ft?

Accepted Answer

1 kN·m ≈ 0.7376 kip·ft, and 1 kip·ft ≈ 1.3558 kN·m. The exact factor is derived from 1 kip = 4448.22 N and 1 ft = 0.3048 m: 1 kip·ft = 4448.22 × 0.3048 = 1355.82 N·m = 1.35582 kN·m. To convert kN·m → kip·ft, multiply by 0.7376; to convert kip·ft → kN·m, multiply by 1.3558. This converter performs the calculation automatically - enter a value, select your source unit, and read any target unit from the results.

Question 6

Why are mN·m and N·mm shown separately if they have the same factor?

Accepted Answer

1 mN·m (millinewton-meter) and 1 N·mm (newton-millimeter) are numerically identical: both equal 0.001 N·m. However, they are labelled differently in industry datasheets - N·mm is the preferred notation in mechanical component design (precision gears, small actuators, miniature bearings), while mN·m is used in instrument and microelectromechanical contexts. Showing both avoids confusion about which notation a specification is using.

Question 7

How do I convert in the other direction?

Accepted Answer

Hover any result row and click the swap icon (⇅) to use that unit and value as the new input, reversing the conversion instantly. You can also click the ⇄ button between the From and To fields to swap both units while updating the value.

Question 8

Is my data private?

Accepted Answer

Yes - all conversions run entirely in your browser using JavaScript and exact NIST-traceable conversion factors. No data is ever sent to any server.

Moment of Force Converter

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