Convert Torque from Ounce-inches to Kilogram-meters (ozf-in to kgm)

Ounce-inch to Kilogram-meter Conversion Formula

Example

Let's convert 5 Ounce-inch (ozf-in) to Kilogram-meter (kgm).

Using the formula:

Therefore, 5 Ounce-inch (ozf-in) is equal to 0.0036003895315923581028 Kilogram-meter (kgm).

How many ounce-inches are in one kilogram-meter? One Kilogram-meter (kgm) contains 1388.738622898014816 Ounce-inches (ozf-in) — the inverse of the factor above. Multiplying by 0.00072007790631847162056 takes you from ounce-inches to kilogram-meters; multiplying by 1388.738622898014816 brings you back.

Put in words: one ounce-inch equals 0.00072007790631847162056 kilogram-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.

What Is an Ounce-inch (ozf·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.

• 1 lbf·in = 16 ozf·in
• 1 lbf·ft = 192 ozf·in
• 1 ozf·in = 0.00706155 N·m

The Unit of Small Motors

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.

Where Ounce-inch Is Used

• Stepper and servo motors — holding torque and detent torque ratings.
• Small gearmotors in appliances, printers and automation.
• Watchmaking and instrument work — miniature screws.
• Torque testing of caps, closures and small assemblies.

Converting Ounce-inch

What Is a Kilogram-meter (kgf·m)?

A kilogram-meter (kgf·m), sometimes written kg·m or kgm, is the torque produced by one kilogram-force acting at one metre from the axis.

• 1 kgf·m = 9.80665 N·m

A Gravitational Metric Unit

Like the kilogram-force it derives from, this unit builds the Earth's gravity into its definition. That made it convenient before SI was standardised — a 1 kg weight hung on a 1 m arm gives exactly 1 kgf·m — but it is deprecated in modern engineering, where N·m is the correct unit.

Where You Still Meet It

• Older Japanese and European vehicles — service manuals from the 1970s and 1980s specify torque in kgf·m.
• Motorcycle specifications, where engine torque is still occasionally quoted in kgf·m.
• Legacy torque wrenches with kgf·m scales.
• Older industrial machinery documentation.

If a workshop manual gives 11 kgf·m for a wheel nut, that is roughly 108 N·m — a normal modern figure, just written in an older unit.

Converting Kilogram-meter

Ounce-inch to Kilogram-meter Conversion Table

Here are some quick reference conversions from Ounce-inch (ozf-in) to Kilogram-meter (kgm):