Atmospheres to Kilopascals
Type a value in either box to convert between atmospheres and kilopascals. The factor is 101.325.
| Atmospheres | Kilopascals |
|---|---|
| 1 atm | 101.325 kPa |
| 2 atm | 202.65 kPa |
| 3 atm | 303.975 kPa |
| 5 atm | 506.625 kPa |
| 10 atm | 1013.25 kPa |
| 25 atm | 2533.125 kPa |
| 50 atm | 5066.25 kPa |
| 100 atm | 10132.5 kPa |
How to use
- Enter a value in the Atmospheres field.
- The Kilopascals figure appears immediately — no button to press.
- Typing in the Kilopascals field converts back to Atmospheres the same way.
- Use the reference table for the values that come up most often.
Atmospheres to Kilopascals formula
The factor from atmospheres to kilopascals is 101.325.
kPa = atm × 101.325
Why this factor: the atmosphere and the kilopascal are both defined against the pascal, so dividing one definition by the other gives 101.325 directly. Both definitions are set out in full below.
To go the other way, divide by 101.325 — or use the Kilopascals to Atmospheres converter, which is the same calculation reversed.
Worked example
Given 100 atm, multiplying by 101.325 yields 10132.5 kPa.
100 atm × 101.325 = 10132.5 kPa
The converter above does this for any value you type, in either direction.
What is an atmosphere?
A standard atmosphere is a fixed reference pressure, originally average sea-level air pressure.
Definition: Defined as exactly 101,325 pascals — an exact convention, not a measurement.
Where it is used: Chemistry reference conditions, diving pressure, and high-pressure physics.
What is a kilopascal?
A kilopascal is 1,000 pascals, the practical metric pressure unit.
Definition: Exactly 1,000 pascals. Standard atmospheric pressure is 101.325 kPa.
Where it is used: Tyre pressures outside the US, weather reports in Canada, and structural engineering loads.
Atmospheres vs Kilopascals
The atmosphere is a specialized unit while the kilopascal is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many kilopascals are in an atmosphere?
One atmosphere equals 101.325 kilopascals.
What is the formula to convert atmospheres to kilopascals?
Multiply the number of atmospheres by 101.325. To reverse it, divide by 101.325 instead.
How do I convert kilopascals back to atmospheres?
Divide by 101.325, which is the same as multiplying by 0.00986923267.
How many kilopascals are in 10 atmospheres?
10 atm works out to 1013.25 kPa.
How is the atmosphere defined?
Defined as exactly 101,325 pascals — an exact convention, not a measurement.