Atmospheres to kilopascals
Multiply atmospheres by 101.325 to get kilopascals.
3 atm = 303.975 kPa
How to convert atmospheres to kilopascals
The kilopascal is one thousand pascals (10³ Pa), the metric pressure unit. The atmosphere is the standard atmosphere, exactly 101 325 pascals.
Worked example — 3 atm: 3 × 101.325 = 303.975 kPa.
Atmospheres to kilopascals table
| Atmospheres | Kilopascals |
|---|---|
| 0.5 atm | 50.6625 kPa |
| 1 atm | 101.325 kPa |
| 1.5 atm | 151.9875 kPa |
| 2 atm | 202.65 kPa |
| 3 atm | 303.975 kPa |
| 5 atm | 506.625 kPa |
| 10 atm | 1,013.25 kPa |
| 50 atm | 5,066.25 kPa |
| 100 atm | 10,132.5 kPa |
Reverse and related
About atmospheres and kilopascals
Atmosphere (atm)
1 atm = 101.325 kPaDefinition. The standard atmosphere, exactly 101 325 pascals
History and origin
The standard atmosphere was defined as a reference pressure of exactly 101 325 pascals, close to average pressure at sea level. It gave a convenient benchmark before the pascal became standard.
Current use
Atmospheres are used in diving, chemistry and when describing pressure at altitude.
Source: NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi)
Kilopascal (kPa)
1 kPa = 0.00986923 atmDefinition. One thousand pascals (10³ Pa), the metric pressure unit
History and origin
The kilopascal is one thousand pascals, a metric multiple of the SI pressure unit. It gives conveniently sized numbers for everyday pressures.
Current use
Kilopascals are used for tyre pressure in metric countries and throughout engineering.
Source: NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi)
Where people use this
Atmospheres: diving, chemistry, altitude. Kilopascals: tyre pressure (metric), engineering. 1 atm is exactly 101.325 kPa.
Every value is carried to full double precision; the display is rounded.
Both units are defined in NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi).
Questions people ask
How many kPa in an atmosphere?
One atmosphere is exactly 101.325 kPa.
How many kPa is 2 atm?
2 atm is exactly 202.65 kPa.
How many kPa is standard pressure?
Standard atmospheric pressure is 101.325 kPa.