Nm to Kgf Cm Converter
Convert torque between Newton-meters and kilogram-force centimeters. Enter values for instant results with step-by-step formulas.
Formula
kgf-cm = Nm x 10.19716213
Where kgf-cm is kilogram-force centimeters and Nm is Newton-meters. The conversion factor comes from dividing 1 Newton by the standard gravitational acceleration (9.80665 m/s2) to get kilograms-force, then multiplying by 100 to convert meters to centimeters. To reverse, divide kgf-cm by 10.19716213.
Worked Examples
Example 1: Servo Motor Torque Conversion
Problem: A Japanese servo motor is rated at 25 kgf-cm. What is the equivalent torque in Newton-meters?
Solution: Nm = kgf-cm / 10.19716213\nNm = 25 / 10.19716213\nNm = 2.4517 Newton-meters\n\nAlso: 2.4517 Nm x 0.7376 = 1.8087 ft-lb
Result: 25 kgf-cm = 2.4517 Nm
Example 2: Industrial Motor Specification
Problem: A motor produces 5.5 Nm of rated torque. Express this in kgf-cm for a specification sheet.
Solution: kgf-cm = Nm x 10.19716213\nkgf-cm = 5.5 x 10.19716213\nkgf-cm = 56.08 kilogram-force centimeters\n\nAlso: 5.5 Nm = 0.5608 kgf-m
Result: 5.5 Nm = 56.08 kgf-cm
Frequently Asked Questions
What is a kilogram-force centimeter (kgf-cm)?
A kilogram-force centimeter is a unit of torque in the gravitational metric system that represents the torque produced by one kilogram of force acting at a distance of one centimeter from the rotation axis. Despite not being an official SI unit, kgf-cm remains widely used in many Asian manufacturing specifications, particularly in Japan, China, and South Korea. This unit is popular in servo motor specifications, small actuator ratings, and precision mechanical assemblies. Many RC hobby servo motors are rated in kgf-cm because the values are intuitively easy to understand. For instance, a servo rated at 15 kgf-cm can hold a 15 kg weight at one centimeter from the shaft center.
What is the exact conversion between Nm and kgf-cm?
The precise conversion factor from Newton-meters to kilogram-force centimeters is 10.19716213. This means one Newton-meter equals approximately 10.197 kgf-cm. The factor derives from the relationship between Newtons and kilogram-force (1 kgf equals 9.80665 N, the standard gravitational acceleration) and between meters and centimeters (100 cm per meter). To convert Nm to kgf-cm, multiply by 10.19716213. To convert kgf-cm to Nm, divide by 10.19716213 or multiply by 0.0980665. This conversion is essential when working with specifications from different manufacturing regions or when converting between SI and gravitational metric torque units.
Why do servo motors use kgf-cm instead of Nm?
Servo motors, particularly those used in robotics and RC hobbies, commonly use kgf-cm because the values are more intuitive and practical for the typical torque ranges involved. A small hobby servo might produce 3 to 20 kgf-cm of torque, which is easy to visualize as the weight in kilograms the servo can hold at one centimeter distance. The same values in Newton-meters would be 0.29 to 1.96 Nm, which are less convenient numbers to work with mentally. Additionally, many servo manufacturers are based in Asia where kgf-cm is the traditional torque unit. Industrial servo motors and stepper motors used in CNC machines and automation equipment also frequently specify their holding torque and rated torque in kgf-cm.
How does kgf-cm compare to other common torque units?
Kilogram-force centimeters occupy a useful middle ground between very small and very large torque units. One kgf-cm equals 0.0981 Nm, 0.0723 ft-lb, 0.8681 in-lb, and 13.89 ozf-in. For perspective, a typical door handle requires about 5 to 15 kgf-cm to operate, a bottle cap needs around 1 to 3 kgf-cm, and a standard RC servo produces 10 to 25 kgf-cm. The larger unit kgf-m (kilogram-force meter) equals 100 kgf-cm and is sometimes used for larger machinery torque specifications. When comparing specifications across manufacturers from different countries, understanding these relationships prevents costly mistakes in motor selection and mechanical design.
What applications require precise torque conversion between Nm and kgf-cm?
Precise torque conversion is critical in several engineering domains. Robotics engineers frequently need to convert between these units when selecting servo motors from Asian manufacturers for designs specified in SI units. CNC machine builders must match spindle motor torque ratings with mechanical load requirements, often crossing unit systems. Medical device manufacturing requires exact torque specifications for joint mechanisms in prosthetics and surgical robots. Automotive assembly plants use both unit systems depending on fastener origin and equipment supplier. Electronics manufacturing specifies tiny fastener torques in kgf-cm for components like hard drive screws and circuit board standoffs, requiring conversion when using internationally sourced torque drivers.
What is the difference between kgf-cm and kgf-m?
The difference between kgf-cm and kgf-m is simply a factor of 100, corresponding to the number of centimeters in a meter. One kgf-m equals 100 kgf-cm, and one kgf-m equals 9.80665 Nm. The kgf-cm unit is preferred for smaller torque applications like servo motors, small actuators, and precision mechanisms where typical values fall between 1 and 100 kgf-cm. The kgf-m unit is used for larger applications such as industrial motors, vehicle axle torque, and heavy machinery where values in kgf-cm would result in unwieldy large numbers. For example, a car engine producing 200 Nm of torque would be 20,394 kgf-cm but a more manageable 20.4 kgf-m. Always verify which unit is being referenced in specifications.