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To convert from Ounce-inch (ozf-in) to Newton-meter (Nm), use the following formula:
Newton-meter (Nm)
= 0.005208333271755643 × 1.355818× Ounce-inch (ozf-in)
= 0.007061551999845192381× Ounce-inch (ozf-in)
With 1.355818 is the ratio between the base units Newton-meter (Nm) and Pound-foot (lbf-ft).
Let's convert 5 Ounce-inch (ozf-in) to Newton-meter (Nm).
Using the formula:
5 × 0.007061551999845192381 = 0.035307759999225961905
Therefore, 5 Ounce-inch (ozf-in) is equal to 0.035307759999225961905 Newton-meter (Nm).
How many ounce-inches are in one newton-meter? One Newton-meter (Nm) contains 141.61192893883987621 Ounce-inches (ozf-in) — the inverse of the factor above. Multiplying by 0.007061551999845192381 takes you from ounce-inches to newton-meters; multiplying by 141.61192893883987621 brings you back.
Put in words: one ounce-inch equals 0.007061551999845192381 newton-meters, so the ounce-inch is the smaller unit of this pair. Converting between them never changes the amount of torque being measured — only the size of the unit you count it in.
An ounce-inch (ozf·in) is one ounce-force applied at one inch from the axis — the smallest of the common imperial torque units.
Ounce-inches exist because small electric motors produce tiny torques that would be unreadable in pound-feet. A stepper motor rated at 0.35 lbf·ft is far more naturally described as 67 ozf·in, and that is how manufacturers publish it.
If you are choosing a stepper or servo for a 3D printer, CNC machine or robot, the datasheet holding-torque figure will almost certainly be in ozf·in or in N·cm.
| From | To | Multiply by |
|---|---|---|
| ozf·in | N·m | 0.00706155 |
| ozf·in | lbf·in | 0.0625 |
| ozf·in | lbf·ft | 0.00520833 |
A newton-meter (N·m) is the SI unit of torque — the twisting force that makes something rotate. One newton-meter is produced when a force of one newton acts at a perpendicular distance of one metre from the axis of rotation.
The distance matters as much as the force. Pushing on a spanner with 20 N at 0.5 m from the bolt gives 10 N·m. The same 20 N applied through a spanner twice as long gives 20 N·m — identical effort, double the turning effect. This is why a breaker bar loosens a bolt that a short wrench cannot.
The distance is always measured perpendicular to the line of the force. Pulling at an angle reduces the effective lever arm and therefore the torque.
Both work out to the same base units (kg·m²/s²), but they describe different things and must never be interchanged:
Standards keep them apart deliberately: energy is written in J, torque in N·m.
| Torque | Typical example |
|---|---|
| 5 N·m | bicycle stem bolt |
| 25 N·m | car spark plug |
| 110 N·m | car wheel nut |
| 400 N·m | family car engine peak |
Here are some quick reference conversions from Ounce-inch (ozf-in) to Newton-meter (Nm):
| Ounce-inches | Newton-meters |
|---|---|
| 0.000001 ozf-in | 7.061551999845192381× 10-9 Nm |
| 0.001 ozf-in | 0.000007061551999845192381 Nm |
| 0.1 ozf-in | 0.0007061551999845192381 Nm |
| 1 ozf-in | 0.007061551999845192381 Nm |
| 2 ozf-in | 0.014123103999690384762 Nm |
| 3 ozf-in | 0.021184655999535577143 Nm |
| 4 ozf-in | 0.028246207999380769524 Nm |
| 5 ozf-in | 0.035307759999225961905 Nm |
| 6 ozf-in | 0.042369311999071154286 Nm |
| 7 ozf-in | 0.049430863998916346667 Nm |
| 8 ozf-in | 0.056492415998761539048 Nm |
| 9 ozf-in | 0.063553967998606731429 Nm |
| 10 ozf-in | 0.07061551999845192381 Nm |
| 20 ozf-in | 0.14123103999690384762 Nm |
| 30 ozf-in | 0.21184655999535577143 Nm |
| 40 ozf-in | 0.28246207999380769524 Nm |
| 50 ozf-in | 0.35307759999225961905 Nm |
| 100 ozf-in | 0.7061551999845192381 Nm |
| 1000 ozf-in | 7.061551999845192381 Nm |
| 10000 ozf-in | 70.61551999845192381 Nm |
For all Torque converters, choose units using the From/To dropdowns above.