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Torque Converter

Converts torque (moment of force) between N·m, kN·m, N·cm, mN·m, lbf·ft, lbf·in, kgf·m, kgf·cm and ozf·in using exact force and length definitions (1 lbf·ft = 1.3558179483 N·m).

When to use

You need a wrench, bolt or engine torque in another unit, e.g. lb-ft to N·m, N·m to lb-in or kgf·m to N·m.

Do not use when: You need energy in joules or foot-pounds of work (use energy; torque and energy share dimensions but are different quantities) or the force alone (use force).

Formula

result = value × factor, factor = (1 from_unit in Nm) / (1 to_unit in Nm)

Torque = force × lever arm, so the factors are products of the force factors (lbf, kgf, ozf) and length factors (ft, in, m, cm).

Inputs

Parameter	Type	Required	Description
`value`	number	yes	Amount to convert, expressed in from_unit.
`from_unit`	enum: Nm \| kNm \| Ncm \| mNm \| lbf_ft \| lbf_in \| kgf_m \| kgf_cm \| ozf_in	yes	Unit of the input value. Accepted symbols: Nm, kNm, Ncm, mNm, lbf_ft, lbf_in, kgf_m, kgf_cm, ozf_in; spelled-out names and common abbreviations are accepted too.
`to_unit`	enum: Nm \| kNm \| Ncm \| mNm \| lbf_ft \| lbf_in \| kgf_m \| kgf_cm \| ozf_in	yes	Unit to convert into (same symbols as from_unit).

Outputs

Output	Type	Description
`result`	number	Converted value expressed in to_unit (rounded to 6 decimals; see result_text for very small or very large values).
`result_text`	string	The conversion as text with 6 significant figures, e.g. "5 mi = 8.04672 km".
`formula`	string	Relation used, e.g. "1 mi = 1.609344 km".
`factor`	number	Multiplier from from_unit to to_unit (result = value × factor); absent for non-linear conversions.
`conversion_table`	object	The input value expressed in every supported torque unit (6 significant figures), keyed by unit symbol.

Example

100 lb-ft to newton-metres: {"value":100,"from_unit":"lbf_ft","to_unit":"Nm"} → {"result":135.581795,"factor":1.3558179483,"formula":"1 lbf·ft = 1.355817948 N·m","conversion_table":{"kgf_m":13.8255,"lbf_in":1200}}

250 N·m to lb-ft: {"value":250,"from_unit":"Nm","to_unit":"lbf_ft"} → {"result":184.390861,"conversion_table":{"kgf_m":25.4929,"lbf_in":2212.69}}

GET https://tttkmbb.com/api/v1/calculate/torque?value=100&from_unit=lbf_ft&to_unit=Nm

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/torque (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/torque · Markdown: https://tttkmbb.com/conversion/torque.md · JSON definition: https://tttkmbb.com/conversion/torque.json
MCP: server https://tttkmbb.com/mcp, tool run_calculator with calculator_id="torque"
OpenAPI operationId: convert_torque
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

FAQ

Is lb-ft the same as ft-lb?

Both spellings denote the same torque unit (1 lbf·ft = 1.35582 N·m) and are accepted here. Foot-pound is also used for energy (ft·lbf in the energy converter); the numeric factor to joules is identical.

How do I enter N·m?

Use Nm (or N·m, N-m, newton metre); kgf·m is kgf_m and inch-pounds are lbf_in.

Related calculators

Force Converter — Force units behind each torque unit.
Energy Converter — Same dimensions (N·m = J) but a different quantity.
Work & Power Calculator — Work and power from force and motion.