Controlled unit worksheet
Torque Unit Conversion
Convert a signed moment-of-force or torque value through N·m using documented conversion factors. This page converts units only; it does not select a tightening torque or assess equipment.
Entrada
Conversion record
| Unidade | Converted value |
|---|---|
| N·m | — |
| N·mm | — |
| mN·m | — |
| dN·m | — |
| kgf·m | — |
| lbf·ft | — |
| lbf·in | — |
| ozf·in | — |
Method and factors
Canonical calculation
Each input is first converted to N·m and then divided by the target-unit factor:
xpara = M[N·m] / cpara
The same signed physical quantity is represented in every row. Conversion does not change direction, uncertainty or meaning.
Factors used
1 mN·m = 0.001 N·m
1 dN·m = 0.1 N·m
1 kgf·m = 9.80665 N·m
1 lbf·ft = 1.3558179483314004 N·m
1 lbf·in = 0.1129848290276167 N·m
1 ozf·in = 0.007061551814226043 N·m
The lbf-based factors are derived from the NIST exact lbf factor at standard gravity and the exact international foot/inch definitions. This preserves exactly 12 in = 1 ft and 16 ozf = 1 lbf. Displayed digits do not create measurement accuracy.
Quantity and notation
Torque is not energy
BIPM identifies torque as the cross product of position and force. Its SI unit is N·m. Torque and energy share dimensions, but the joule is not used for torque; the quantity name and context matter.
Force units, not mass units
kgf, lbf e ozf are force units. They must not be confused with kg, lb or oz mass.
SI prefixes
dN·m means decinewton metre and equals 0.1 N·m. mN·m means millinewton metre. N·mm e mN·m are numerically equal for the same torque, but their written unit expressions differ.
Signed values
A minus sign is retained in every output. It has meaning only after the user defines an axis and positive direction; the converter does not decide clockwise/counter-clockwise or input/output direction.
Sources and normative status
| Fonte | Verified use | Limite |
|---|---|---|
| BIPM SI Brochure, 9th edition, version 4.01 (2026) | Torque unit N·m; torque/energy distinction; SI prefix values. | Official SI publication. |
| NIST SP 811, Appendix B.8 and footnote 23 | kgf·m and moment-of-force factors; exact lbf conversion at standard gravity; foot/inch relations. | Official conversion table and definition note. Decimal calculation is shown transparently. |
| ISO 80000-4:2019 + Amd 1:2025 | Official public lifecycle and mechanics quantities/units scope. | Published and marked to be revised; exact clauses require a licensed controlled copy. This converter makes no ISO-conformity claim. |
Check example
Using the derived factor, 10 lbf·ft × 1.3558179483314004 = 13.558179483314004 N·m. The same quantity is exactly 120 lbf·in before display rounding because 1 ft = 12 in.
