Torque Unit Converter
Convert torque unit between units instantly. Includes conversion tables, common equivalents, and calculation formulas.
Reviewed for accuracy by Manoj Kumar, Mathematics Educator
Torque Unit Converter
Calculator
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Formula: Target = Value x (Source Factor / Target Factor)
Worked example โ 120 Nm = 88.51 lb-ft
Formula
Target = Value x (Source Factor / Target Factor)
All torque units are converted through Newton-meters as the base unit. The input value is first multiplied by its conversion factor to get Newton-meters, then divided by the target unit conversion factor. This two-step process ensures accurate conversions between any pair of torque units.
Worked Examples
Example 1: Automotive Bolt Torque Spec
Problem:A European car manual specifies wheel lug nut torque as 120 Nm. Convert to lb-ft for an American torque wrench.
Solution:lb-ft = Nm x 0.7376 lb-ft = 120 x 0.7376 lb-ft = 88.51 Also: 120 Nm = 1061.82 lb-in = 1223.27 kg-cm
Result:120 Nm = 88.51 lb-ft
Example 2: Servo Motor Specification
Problem:A servo motor is rated at 15 kg-cm. Convert to oz-in and Nm.
Solution:Nm = kg-cm x 0.0980665 = 15 x 0.0980665 = 1.471 Nm oz-in = Nm / 0.00706155 = 1.471 / 0.00706155 = 208.33 oz-in lb-in = Nm / 0.112985 = 1.471 / 0.112985 = 13.02 lb-in
Result:15 kg-cm = 1.471 Nm = 208.33 oz-in
Frequently Asked Questions
What is a Newton-meter (Nm) of torque?
A Newton-meter is the SI unit of torque, defined as the rotational force produced when a force of one Newton is applied perpendicularly at one meter from the axis of rotation. It is the most widely used torque unit in engineering and automotive specifications outside the United States. One Newton-meter equals approximately 0.7376 pound-feet. The unit should not be confused with the Joule, which has the same dimensions but measures energy rather than torque.
How do I convert between pound-feet and Newton-meters?
To convert pound-feet to Newton-meters, multiply by 1.35582. To convert Newton-meters to pound-feet, multiply by 0.7376 (or divide by 1.35582). For example, a torque specification of 100 lb-ft equals 135.58 Nm. This conversion is frequently needed when working with American vehicles that spec torque in lb-ft and using tools calibrated in Nm, or when comparing engine specifications across different markets.
When would I use kilogram-centimeters or ounce-inches for torque?
Kilogram-centimeters (kg-cm) are commonly used for small servo motors, RC hobby servos, and some Asian-manufactured equipment where the kilogram-force system is still used. Ounce-inches (oz-in) are standard in American small motor and precision instrument specifications, such as stepper motors, small DC motors, and torque specifications for electronic component fasteners. Both units are practical for small torque values where Newton-meters would require inconveniently small numbers.
What is the difference between torque and work, since both use similar units?
Torque and work both have units of force times distance, but they describe fundamentally different physical quantities. Torque is a rotational force applied about an axis, measured in Newton-meters (Nm), while work is energy transferred by a force through a linear distance, measured in Joules (J). Although 1 Nm equals 1 J dimensionally, they are not interchangeable. Torque involves a perpendicular force and a moment arm, while work involves a parallel force and a displacement.
How do significant figures affect unit conversions?
Your converted result should have the same number of significant figures as your original measurement. If you measure 5.2 inches (2 significant figures), converting to centimeters gives 13 cm, not 13.208 cm. Using excessive decimal places implies false precision.
When should I use metric vs imperial units?
Use metric for science, medicine, international communication, and precision work. Use imperial when required by local convention (US construction, cooking, road signs). Engineering increasingly uses metric. Always match the unit system expected by your audience or industry.
What are the most common unit conversion mistakes?
Common errors include confusing fluid ounces with weight ounces, mixing up miles and nautical miles, forgetting that UK and US gallons differ (UK is 20% larger), using the wrong temperature formula, and not accounting for the difference between troy and avoirdupois ounces.
What is the origin of common measurement units?
A foot was originally based on the length of a human foot. A yard was the distance from nose to outstretched fingertip. A mile comes from the Roman mille passus (1,000 paces). The meter was defined as one ten-millionth of the distance from equator to pole.
How do I convert between fluid volume units?
Key conversions: 1 gallon = 4 quarts = 8 pints = 128 fluid ounces = 3.785 liters. 1 liter = 1,000 milliliters = 33.814 fluid ounces. 1 cup = 8 fluid ounces = 236.6 milliliters. Note that US and imperial gallons are different sizes.
Why do some countries use different unit systems?
Most countries adopted the metric system after the French Revolution standardized it in the 1790s. The US, Liberia, and Myanmar still primarily use imperial/customary units due to historical inertia, though US science and military use metric.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator ยท Editorial policy
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