Convert Standard Atmospheres to Kilopascals
Convert Standard Atmospheres (atm) to Kilopascals (kPa) instantly and accurately.
Conversion Formula
kPa = atm × 101.325
About Standard Atmospheres
The standard atmosphere (atm) = exactly 101,325 Pa - defined by the 10th CGPM (1954) as the reference air pressure at sea level. Used to define STP (0°C and 1 atm) for gas law and thermochemistry. Chemical equilibrium constants (Kp), Henry's law solubility, and thermodynamic tables are tabulated at 1 atm. ISA aviation standard: sea-level 1 atm / 15°C, pressure halving every ~5.5 km. Diving physics: +1 atm per 10 m depth (fresh water) so 30 m = 4 atm absolute. Diamond formation in Earth's mantle: ~50,000 atm. 1 atm = 101,325 Pa.
About Kilopascals
A kilopascal (kPa) = 1,000 Pa - the practical everyday SI pressure unit for moderate pressures. Car tyre inflation: 200-250 kPa (29-36 psi); truck tyres 550-830 kPa. Blood pressure in SI countries: 16/10.7 kPa (= 120/80 mmHg). Systolic blood pressure 16 kPa. Carbonated beverages are packaged at 200-500 kPa CO₂. Medical oxygen cylinders at 15,000 kPa; scuba cylinders 200-300 bar = 20,000-30,000 kPa. 1 kPa = 1,000 Pa = 0.01 bar = 0.145 psi.
Quick Reference Table
| Standard Atmospheres (atm) | Kilopascals (kPa) |
|---|---|
| 1 atm | 101.325 kPa |
| 2 atm | 202.65 kPa |
| 5 atm | 506.625 kPa |
| 10 atm | 1013.25 kPa |
| 25 atm | 2533.13 kPa |
| 50 atm | 5066.25 kPa |
| 100 atm | 10132.5 kPa |