kPa to atm Converter
Type a value in kilopascals to see it in standard atmospheres as you type, with the exact formula and a reference chart.
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- Atmospheres
- 1 atm
How this was calculated
- 1 standard atmosphere = 101.325 kilopascals
- 101.325 ÷ 101.325 = 1 atm
| kPa | atm |
|---|---|
| 1 kPa | 0.00986923 atm |
| 10 kPa | 0.0986923 atm |
| 25 kPa | 0.246731 atm |
| 50 kPa | 0.493462 atm |
| 75 kPa | 0.740192 atm |
| 90 kPa | 0.888231 atm |
| 100 kPa | 0.986923 atm |
| 101.325 kPa | 1 atm |
| 120 kPa | 1.18431 atm |
| 150 kPa | 1.48038 atm |
| 200 kPa | 1.97385 atm |
| 250 kPa | 2.46731 atm |
| 300 kPa | 2.96077 atm |
| 500 kPa | 4.93462 atm |
| 1,000 kPa | 9.86923 atm |
| atm | kPa |
|---|---|
| 0.005 atm | 0.506625 kPa |
| 0.01 atm | 1.01325 kPa |
| 0.02 atm | 2.0265 kPa |
| 0.05 atm | 5.06625 kPa |
| 0.1 atm | 10.1325 kPa |
| 0.2 atm | 20.265 kPa |
| 0.5 atm | 50.6625 kPa |
| 1 atm | 101.325 kPa |
| 2 atm | 202.65 kPa |
| 5 atm | 506.625 kPa |
| 10 atm | 1,013.25 kPa |
How to convert kilopascals to standard atmospheres
1 kilopascal = 0.0098692327 standard atmospheres. To convert kilopascals to standard atmospheres, divide by 101.325 (or multiply by 0.0098692327). A kilopascal is 1,000 pascals; standard atmospheric pressure is 101.325 kPa. One standard atmosphere is exactly 101,325 pascals (101.325 kPa), roughly the air pressure at sea level.
Worked examples
- 50 kilopascals = 0.493462 atm (50 ÷ 101.325)
- 101.325 kilopascals = 1 atm (101.325 ÷ 101.325)
- 250 kilopascals = 2.46731 atm (250 ÷ 101.325)
Where this conversion comes up
Kilopascals are used for tire pressure outside the US, weather and engineering; standard atmospheres for chemistry, gas laws and diving. Chemistry problems switch between kilopascals (SI) and atmospheres because the gas constant comes in both forms (8.314 L·kPa/(mol·K) and 0.08206 L·atm/(mol·K)). Standard pressure is exactly 101.325 kPa = 1 atm. Some textbooks use STP at 100 kPa (1 bar) instead, which is 0.987 atm, so check which standard your course uses.
Quick estimate
Divide by 100 and subtract 1.3%: 200 kPa ≈ 1.97 atm.
Common mistakes
- Multiplying instead of dividing. A standard atmosphere is larger than a kilopascal, so the number of standard atmospheres must come out smaller: 50 kilopascals = 0.493462 atm.
- Rounding too early. Keep the full factor until the last step; rounding 0.00987 to 0.0099 first puts large values noticeably off.
Related pressure converters: bar to psi, psi to bar, kpa to psi, psi to kpa, mpa to psi, psi to mpa.
Frequently asked questions
How do you convert kilopascals to standard atmospheres?
Multiply the kilopascals by 0.0098692327 (or divide by 101.325). For example, 101.325 kilopascals is 1 standard atmospheres.
How many standard atmospheres are in one kilopascal?
One kilopascal is 0.0098692327 standard atmospheres. A kilopascal is 1,000 pascals; standard atmospheric pressure is 101.325 kPa.
What is 250 kilopascals in standard atmospheres?
250 kilopascals is 2.46731 standard atmospheres.
Is there a quick way to estimate kilopascals to standard atmospheres?
Divide by 100 and subtract 1.3%: 200 kPa ≈ 1.97 atm.