# Torque converter

> How much torque is that in other units? Convert between newton metres, foot-pounds, inch-pounds, kilogram-force metres and more.

Free torque converter: newton metres, foot-pounds (lbf·ft), inch-pounds, kgf·m and N·cm, for bolts, wrenches and engines, with exact definitions.

- Page: https://how.box/conversion/torque/
- Runs entirely in the browser.

## Inputs

Answer link: https://how.box/conversion/torque/?v={v}&from={from}&to={to}

- `v` (number 0 to 1e15): The torque to convert, in the from unit. Example: `100`.
- `from` (nm, knm, ncm, kgfm, lbfft, lbfin, ozfin or dyncm): Unit of v (unit id: nm, knm, ncm, kgfm, lbfft, lbfin, ozfin, dyncm). Example: `nm`.
- `to` (nm, knm, ncm, kgfm, lbfft, lbfin, ozfin or dyncm): Unit to convert to (unit id). Example: `lbfft`.

Example answer: https://how.box/conversion/torque/?v=100&from=nm&to=lbfft

A complete link carries the primary answer in the page HTML; a missing or invalid value shows the default page.

## Agent tools

- `torque_convert`: Converts a torque between units using exact definitions (1 kgf·m = 9.80665 N·m, 1 lbf·ft = 0.45359237 × 9.80665 × 0.3048 N·m ≈ 1.355818 N·m, 1 lbf·in ≈ 0.1129848 N·m, 1 ozf·in ≈ 0.007061552 N·m, 1 N·cm = 0.01 N·m, 1 dyn·cm = 1e-7 N·m; NIST SP 811 B.9).
  - MCP, one POST to https://how.box/mcp: `{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"torque_convert","arguments":{"value":100,"from_unit":"nm","to_unit":"lbfft"}}}`
  - GET: https://how.box/mcp/run/torque_convert?value=100&from_unit=nm&to_unit=lbfft

## How it works

Torque is a force times the distance from the axis it turns around. The SI unit is the newton metre (N·m): one newton pushing at the end of a one-metre lever. Every unit here is converted through newton metres.

A foot-pound (lbf·ft) is one pound-force at one foot: 0.45359237 kg × 9.80665 m/s² × 0.3048 m ≈ 1.3558 N·m. So 100 N·m ÷ 1.3558 ≈ 73.76 lbf·ft. An inch-pound is a twelfth of a foot-pound, and a kilogram-force metre is exactly 9.80665 N·m.

The definitions come from NIST Special Publication 811. Torque values in manuals are often rounded, so a converted setting is only as precise as the number you start from.

## FAQ

**How many N·m is 1 foot-pound?**
About 1.3558 N·m. Multiply foot-pounds by 1.3558 to get newton metres.

**Are foot-pounds and pound-feet the same?**
For torque, yes: both mean one pound-force acting at one foot. Engineers often write lbf·ft (pound-feet) to tell torque from the foot-pound of energy.

**How many inch-pounds is a newton metre?**
About 8.85 lbf·in.

**How do I convert inch-pounds to foot-pounds?**
Divide by 12. For example, 120 lbf·in is 10 lbf·ft. Check the unit carefully before setting a torque wrench.

**Does this tell me the correct tightening torque?**
No. It only converts a value you already have. Get the specified torque and lubrication conditions from the manufacturer.

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