Convert Kilopascals to Standard Atmospheres
Convert Kilopascals (kPa) to Standard Atmospheres (atm) instantly and accurately.
Conversion Formula
atm = kPa × 0.009869232667
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.
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.
Quick Reference Table
| Kilopascals (kPa) | Standard Atmospheres (atm) |
|---|---|
| 1 kPa | 0.00986923 atm |
| 2 kPa | 0.0197385 atm |
| 5 kPa | 0.0493462 atm |
| 10 kPa | 0.0986923 atm |
| 25 kPa | 0.246731 atm |
| 50 kPa | 0.493462 atm |
| 100 kPa | 0.986923 atm |