kg/cm² – Kilogram per Square Centimetre Pressure Unit

Kilogram or Kilogram Force per Square Centimeter (kg/cm2 or kgf/cm2) is a pressure unit that has been largely superseded by the SI unit system of pascal units. It is the metric equivalent of pounds per square inch (psi). 1 kg/cm2 equals 98,066.5 Pascals.

Similarly to psi, kg/cm2 is part of a group of pressure units that relate pressure with weight. This is convenient in applications where a pressure is applied to generate a load such as in material testing. Typically a piston cylinder device is utilised to convert the applied pressure into a force. The force can be easily calculated in kilograms weight by multiplying the kg/cm2 pressure by the area to determine the weight applied in kilogrammes.

The most popular way of writing Kilogrammes per Square Centimeter is as kg/cm2, even though kgf/cm2 describes its meaning more accurately. The conventional way of writing it is misleading to some, since it reads as Mass / Unit Area and leads to confusion since pressure is always defined as Force / Unit Area.

To calculate a kg/cm2 reading into another pressure unit you can multiply it by one of the values in the table below. To convert a value to kgf/cm2 just click on the relevant unit below to obtain the reverse conversion factor.

Alternatively If you have a number of values to convert you can use the pressure converter to save time.

Find out how kg/cm2 is calculated from SI units and view the alternative ways of writing kg/cm2.

kg/cm² Pressure Conversion Factors

Please note that the conversion factors above are accurate to 6 significant figures.

kg/cm² Derivation

The calculation below shows how the pressure unit Kilogram per Square Centimetre (kg/cm²) is derived from SI Units.

Formula

  • Pressure = Force / Area
  • Force = Mass x Acceleration
  • Acceleration = Distance / (Second x Second)

SI Units

  • Mass: Kilogram (kg)
  • Length: Metre (m)
  • Time: Second (s)
  • Force: Newton (N)
  • Pressure: Pascal (Pa)

Input Values

  • 1 Kilogram = 1 kg
  • 1 Centimetre = 0.01 m
  • 1 Square Centimetre = 0.01 m x 0.01 m = 0.0001 m²
  • Acceleration = Standard Gravity = 9.80665 m/s²

Calculation

  • 1 Kilogram Force = 1 kg x 9.80665 m/s² = 9.80665 N
  • 1 kg/cm² Pressure = 9.80665 N / 0.0001 m² = 98066.5 Pa

kg/cm² Alternate Descriptions

These are the different versions used for identifying kg/cm² that you may find elsewhere.

  • Kilogram per Square Centimetre
  • Kilogram Force per Square Centimetre
  • Kilogram per Square Centimeter
  • Kilogram Force per Square Centimeter
  • Kilogrammes per Square Centimetre
  • Kilogrammes Force per Square Centimetre
  • Kilogrammes per Square Centimeter
  • Kilogrammes Force per Square Centimeter
  • Kilograms per Square Centimetre
  • Kilograms Force per Square Centimetre
  • Kilograms per Square Centimeter
  • Kilograms Force per Square Centimeter
  • Kilopond per Square Centimetre
  • Kilopond per Square Centimeter
  • Kiloponds per Square Centimetre
  • Kiloponds per Square Centimeter
  • kg/cm²
  • kgf/cm²
  • kg/sq cm
  • kgf/sq cm
  • kg/cm^2
  • kgf/cm^2
  • kp/cm²

kg/cm² Help

kg/m² vs kg/cm²

Why not use kgf/m² instead of kgf/cm²?

kgf/cm2 is equal to 0.980665 bar, 10 mH2O  & 14.22 psi, so it is the right size of unit for many applications, particularly hydraulics where kgf and cm2 are measured separately.

kgf/m2 is equal to 0.0980665 mbar, 1mmH2O & 0.001422 psi, so it is a very small unit. Typically kgf is used in hydraulics so the pressure is high, and therefore this unit is not practical to use.

There is nothing stopping you using kgf/m2, it’s just not very useful for hydraulics, but it would be for low pressure, but other units such as inH2O and Pascals tend to be the most popular.

kp/cm² meaning

What are kp/cm² units?

kp/cm² means kiloponds per square centimetre which is a measure of pressure or tensile strength. The unit is exactly equal to kilogram force per square centimetre (kgf/cm² or kg/cm²).

A kilopond is a force equal to the weight of 1 kg being pulled by an acceleration of 9.80665 m/s² (standard gravity). A square centimetre represents the area over which the force is distributed.

Does kg/cm² = kgf/cm²

Is it correct to write kg/sq cm as a unit of pressure?

It is not strictly correct, since kg is not a measure of force but of mass, but you will find that most documentation and instrumentation refer to the pressure unit as kg/cm² rather than the more correct form of kgf/cm² (kilogram force per square centimetre).

When you see kg/cm² written as a pressure unit it is assumed to be kgf/cm² since pressure can only be a quantity of ‘force’ divided by ‘area’. This is self-evident when you consider that the widely used ‘psi’ pressure unit is also a very popular shortened form of pfsi (pounds force per square inch).

kgf is the force created by the earth’s gravity at sea level (9.80665m/s² acting on a 1 kilogram mass and is defined as follows:

1 kgf = Mass x Acceleration = 1 kg x 9.80665 m/s² = 9.80665




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