Kilogram-force per Square Centimeter (kgf/cm²)
A legacy metric unit of pressure equal to one kilogram-force applied over one square centimeter, formally defined as exactly 98,066.5 Pa (using the standard acceleration of gravity g₀ = 9.80665 m/s² per CIPM Resolution 2, 1901). This is the "technical atmosphere" (symbol at) and is roughly equivalent to one standard atmosphere or one bar — but not exactly. Although superseded by SI-proper units (pascal, megapascal) under ISO 80000-4, kgf/cm² persists on industrial gauges in Japan, Korea, and parts of Eastern Europe; on older industrial machinery; on legacy pressure-vessel drawings (where the implicit assumption of g = 9.80665 m/s² matters); on tire-pressure data tables in some markets; and in older engineering textbooks. Engineers updating legacy documentation should be careful: the technical atmosphere (98,066.5 Pa) is NOT the same as the standard atmosphere (101,325 Pa). Converting kgf/cm² to MPa is divide by 10.197 (a clean approximation: ÷10.2); to psi is multiply by 14.223.
The Kilogram-force per Square Centimeter (kgf/cm²) is a unit of pressure with a history connected to the study of fluids, gases, and atmospheric phenomena. Evangelista Torricelli's invention of the barometer in 1643 was a landmark in pressure measurement, and subsequent work by Blaise Pascal established the mathematical foundations. The pascal — the SI unit — was named in Pascal's honor when the SI system was formalized. The Kilogram-force per Square Centimeter reflects either the SI tradition or the practical conventions of specific industries that standardized their measurements independently.
Accurate pressure measurement is critical in engineering, science, commerce, and everyday life. Using the correct unit and applying conversions precisely prevents errors that can be costly or dangerous in professional applications. MegaCalc provides instant, precise conversions for the Kilogram-force per Square Centimeter and all related units so you can work confidently across unit systems.
Conversion Table
| Unit | Symbol | 1 kgf/cm² = |
|---|---|---|
| Pascal | Pa | 98066.5 Pa |
| Kilopascal | kPa | 98.0665 kPa |
| Bar | bar | 0.980665 bar |
| Atmosphere | atm | 0.967841 atm |
| Pound per Square Inch | psi | 14.2233 psi |
| Millimeters of Mercury | mmHg | 735.561 mmHg |
| Megapascal | MPa | 0.0980665 MPa |
| Gigapascal | GPa | 0.0000980665 GPa |
| Kilopound per Square Inch | ksi | 0.0142233 ksi |
| Torr | torr | 735.561 torr |
| Inch of Mercury | inHg | 28.959 inHg |
Conversions Involving Kilogram-force per Square Centimeter
Pascal → Kilogram-force per Square Centimeter
Pa → kgf/cm²
Kilopascal → Kilogram-force per Square Centimeter
kPa → kgf/cm²
Bar → Kilogram-force per Square Centimeter
bar → kgf/cm²
Atmosphere → Kilogram-force per Square Centimeter
atm → kgf/cm²
Pound per Square Inch → Kilogram-force per Square Centimeter
psi → kgf/cm²
Millimeters of Mercury → Kilogram-force per Square Centimeter
mmHg → kgf/cm²
Megapascal → Kilogram-force per Square Centimeter
MPa → kgf/cm²
Gigapascal → Kilogram-force per Square Centimeter
GPa → kgf/cm²
Kilopound per Square Inch → Kilogram-force per Square Centimeter
ksi → kgf/cm²
Torr → Kilogram-force per Square Centimeter
torr → kgf/cm²
Inch of Mercury → Kilogram-force per Square Centimeter
inHg → kgf/cm²
Kilogram-force per Square Centimeter → Pascal
kgf/cm² → Pa
Kilogram-force per Square Centimeter → Kilopascal
kgf/cm² → kPa
Kilogram-force per Square Centimeter → Bar
kgf/cm² → bar
Kilogram-force per Square Centimeter → Atmosphere
kgf/cm² → atm
Kilogram-force per Square Centimeter → Pound per Square Inch
kgf/cm² → psi
Kilogram-force per Square Centimeter → Millimeters of Mercury
kgf/cm² → mmHg
Kilogram-force per Square Centimeter → Megapascal
kgf/cm² → MPa
Kilogram-force per Square Centimeter → Gigapascal
kgf/cm² → GPa
Kilogram-force per Square Centimeter → Kilopound per Square Inch
kgf/cm² → ksi
Kilogram-force per Square Centimeter → Torr
kgf/cm² → torr
Kilogram-force per Square Centimeter → Inch of Mercury
kgf/cm² → inHg
Common Uses of the Kilogram-force per Square Centimeter
- •Automotive — inflating tires to manufacturer-specified pressures
- •Weather reporting — tracking barometric pressure for forecasting
- •Hydraulic systems — designing and operating fluid power equipment
- •Scuba diving — calculating safe dive depths based on partial pressures
- •Medical — measuring blood pressure and calibrating medical equipment
Did You Know?
The deepest point in the ocean — the Challenger Deep in the Mariana Trench — has a water pressure of approximately 110 MPa, or about 1,086 times standard atmospheric pressure. The Kilogram-force per Square Centimeter is one of several units used to express pressures across this extraordinary range.
Scientific Definition of the Kilogram-force per Square Centimeter
The Kilogram-force per Square Centimeter (kgf/cm²) is defined within the context of pressure measurement. Modern metrology ties most measurement units to fundamental physical constants or precisely reproducible laboratory references, ensuring that a measurement made in one laboratory gives the same result as a measurement made anywhere else in the world. This traceability to international standards is what makes the Kilogram-force per Square Centimeter reliable for scientific research, commercial trade, engineering design, and legal metrology. When you use a conversion tool to translate between the Kilogram-force per Square Centimeter and other units, the underlying conversion factors are the exact ratios defined by international standards bodies — not approximations. This means the only limit to the accuracy of a conversion is the precision of your input measurement. For everyday use, converting the Kilogram-force per Square Centimeter to equivalent units in other systems is instant and accurate to many more decimal places than any practical measurement could justify.
Tips for Converting the Kilogram-force per Square Centimeter
When converting the Kilogram-force per Square Centimeter to other pressure units, pay careful attention to the direction of the conversion factor — multiplying and dividing are not interchangeable. A quick sanity check is to estimate the expected magnitude of the result before performing the conversion: if the target unit is larger than the Kilogram-force per Square Centimeter, the numerical value should be smaller, and vice versa. For chained conversions across multiple unit systems, convert everything to a common intermediate unit (typically the SI base unit) and then from that intermediate to the target. This approach is more reliable than direct conversion through multiple factors and makes the calculation easier to verify. When working with very large or very small values, consider whether a metric prefix (milli-, kilo-, mega-) would make the number easier to interpret without losing precision. For critical applications, always cross-check the converted value using a second method — a different calculator, a published table, or a hand calculation using the conversion factor directly.
Accuracy and Precision
Conversion of the Kilogram-force per Square Centimeter is performed using exact, internationally defined factors wherever possible. For units defined by historical artifact or local convention, small differences between national standards may exist — for example, the difference between US survey foot and international foot, or the subtle variations between different definitions of the BTU. These differences are usually negligible for everyday use but matter in precision engineering, legal metrology, and international scientific collaboration. The MegaCalc conversion engine uses the most current internationally accepted values and documents any edge cases where multiple definitions exist. Numerical precision of conversions is carried to at least 10 significant figures internally, with displayed results rounded to a readable length. If you need additional precision for a specific calculation, the underlying engine provides the full precision on request — just inspect the source code or contact us for details.