Convert kilopascals to standard atmospheres
1 kPa = 0.00986923 atm
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How many standard atmospheres are in a kilopascal?
One kilopascal is 0.00986923267 standard atmospheres. To convert any amount, multiply by 0.00986923267. Going the other way, one standard atmosphere is 101.325 kilopascals.
What is the formula to convert kPa to atm?
Multiply the kilopascal figure by 0.00986923267. So atm = kPa × 0.00986923267. For a quick mental estimate, dividing by about 101.33 gets you close enough for most everyday purposes.
What does a kilopascal actually look like?
One kilopascal is a car tyre runs about 220 kPa. The kilopascal is the SI-derived unit used on tyre placards in Canada, Australia and much of Europe, and in weather reporting.
And what is a standard atmosphere?
One standard atmosphere is sea-level air pressure by definition. One standard atmosphere is defined as exactly 101,325 pascals. It is a reference value rather than a measurement of the actual air pressure today.
Is this conversion exact?
Yes. Since the 1959 international yard and pound agreement, the imperial and metric systems are related by exact definitions rather than measurements — the inch is exactly 25.4 mm and the pound exactly 0.45359237 kg. Everything derived from those, including this conversion, is therefore exact. Round at the end rather than partway through, since rounding kPa before converting introduces an error the conversion then multiplies.
About kpa to atm
How to convert kilopascals to standard atmospheres
Multiply by 0.00986923267. One kilopascal is 0.00986923267 standard atmospheres, and one standard atmosphere is 101.325 kilopascals.
atm = kPa × 0.00986923267
Worked example
10 kPa = 0.09869233 atm. For a sense of scale, one kilopascal is a car tyre runs about 220 kPa, and one standard atmosphere is sea-level air pressure by definition.
About the kilopascal
The kilopascal is the SI-derived unit used on tyre placards in Canada, Australia and much of Europe, and in weather reporting.
About the standard atmosphere
One standard atmosphere is defined as exactly 101,325 pascals. It is a reference value rather than a measurement of the actual air pressure today.
Quick reference
| kilopascals | standard atmospheres |
|---|---|
| 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 |
| 1000 kPa | 9.86923 atm |
Getting it right
This conversion is exact by definition, so the only limit on accuracy is how many digits you keep. Round at the end rather than partway through — rounding kPa to a whole number before converting introduces an error that the conversion then multiplies.
Other pressure conversions
Convert standard atmospheres back to kilopascals, or pick any other pair with the full unit converter. Related: kPa to bar, kPa to psi.