Convert Torque from Kilogram-centimeters to Ounce-inches (kg-cm to ozf-in)

Kilogram-centimeter to Ounce-inch Conversion Formula

Example

Let's convert 5 Kilogram-centimeter (kg-cm) to Ounce-inch (ozf-in).

Using the formula:

Therefore, 5 Kilogram-centimeter (kg-cm) is equal to 69.4369311449007408 Ounce-inch (ozf-in).

How many kilogram-centimeters are in one ounce-inch? One Ounce-inch (ozf-in) contains 0.072007790631847162056 Kilogram-centimeters (kg-cm) — the inverse of the factor above. Multiplying by 13.88738622898014816 takes you from kilogram-centimeters to ounce-inches; multiplying by 0.072007790631847162056 brings you back.

Put in words: one kilogram-centimeter equals 13.88738622898014816 ounce-inches, so the kilogram-centimeter is the larger 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 a Kilogram-centimeter (kgf·cm)?

A kilogram-centimeter (kgf·cm) is one kilogram-force acting at one centimetre from the axis. It is one hundredth of a kilogram-meter.

• 1 kgf·cm = 0.0980665 N·m
• 1 kgf·m = 100 kgf·cm

The Hobby Servo Unit

If you have ever bought a hobby servo, you have seen this unit. Servo torque is published almost universally in kgf·cm — a common 9 g micro servo is rated around 1.8 kgf·cm, a standard-size servo around 10–20 kgf·cm.

The rating tells you how much weight the servo can hold at a given arm length: 10 kgf·cm means it can just support 10 kg at 1 cm from the shaft, or 1 kg at 10 cm, or 0.5 kg at 20 cm. Doubling the arm halves the load it can hold.

Where Kilogram-centimeter Is Used

• RC servos and hobby robotics — the dominant unit in datasheets and marketplaces.
• Small gearmotors sold through electronics suppliers.
• Legacy metric torque specifications for small fasteners.
• Tyre valve and small assembly torque figures on older equipment.

Converting Kilogram-centimeter

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

Kilogram-centimeter to Ounce-inch Conversion Table

Here are some quick reference conversions from Kilogram-centimeter (kg-cm) to Ounce-inch (ozf-in):