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Torque Converter

Convert a torque (moment of force) between newton-based units (N·m, kN·m, N·cm, N·mm, dyn·cm), kilogram-force units (kgf·m, kgf·cm, gf·cm) and US units (lbf·ft, lbf·in, ozf·in). Mechanics use it to read a service manual written in a different system, and every factor is exact, so 1 lbf·ft is 1.3558179483314004 N·m.

Unit Converters Runs in your browser

Convert a Torque

Torque settings are often written “ft-lb” or “in-lb”; these mean pound-force feet (lbf·ft) and pound-force inches (lbf·in).

Decimals and scientific notation such as 2.5e3 are accepted.
Automatic shows exact results in full and rounds long ones to 12 significant digits.

How to Use the Torque

  1. Enter the number in Value to convert.
  2. Choose the torque unit you have in From unit and the one you need in To unit; the lists are grouped by system.
  3. The result, the multiplier and the formula appear straight away under the form. Swap units reverses the direction.
  4. Check the table for the same value in every unit, set Precision if you want fewer digits, or press Copy result.

About This Tool

Mechanics setting a torque wrench, cyclists tightening carbon parts, engineers reading motor and servo data sheets, and robotics hobbyists comparing kgf·cm servo ratings.

Input: A number and a unit  ·  Output: The same torque in every unit.

Features and Limitations

Features

  • Exact: 1 lbf·ft = 1.3558179483314004 N·m, 1 lbf·in = 0.1129848290276167 N·m, 1 kgf·m = 9.80665 N·m.
  • Covers servo ratings in kgf·cm and ozf·in as well as wrench settings in N·m and lbf·ft.
  • Formula, one-unit equivalence and table of every unit.
  • Negative values allowed for opposite rotation.

Limitations

  • Torque and energy share the unit N·m but are different quantities; this tool converts torque only (use the Energy Converter for joules).
  • A torque wrench's own accuracy is typically ±3 to 4 %, far coarser than the digits shown.
  • Results are computed in your browser; nothing you enter is sent to a server.

Example

100 N·m = 73.756 lbf·ft = 885.07 lbf·in = 10.197 kgf·m. 25 lbf·ft = 33.895 N·m. A servo rated 20 kgf·cm delivers 1.96 N·m = 277.7 ozf·in.

Frequently Asked Questions

How do I convert N·m to ft-lb?

Multiply by 0.737562149 (or divide by 1.3558179). 50 N·m is about 36.88 lbf·ft.

Is ft-lb the same as lb-ft?

For torque, yes: both describe pound-force feet. Engineers often write lbf·ft for torque and ft·lbf for energy to keep the two apart, but wrenches and manuals use them interchangeably.

Why are servo motors rated in kg·cm?

Hobby servo makers quote torque as the mass (kg) the servo can hold at the end of a 1 cm arm. Strictly this is kgf·cm, equal to 0.0980665 N·m.

Is a newton meter the same as a joule?

Dimensionally yes, but by convention N·m is used for torque and joule for energy or work. A torque does no work until it turns something through an angle.

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