Convert Atmospheres to Kilopascals
Atmospheres to kilopascals is the conversion you need when a pressure is quoted in atmospheres but your gauge, tire chart, or weather report uses kilopascals. One standard atmosphere is exactly 101.325 kilopascals — roughly the average air pressure at sea level — so it's the number most people picture as 'normal' pressure.
Atmospheres to Kilopascals conversion table
| Atmospheres (atm) | Kilopascals (kPa) |
|---|---|
| 1 | 101.325 |
| 2 | 202.65 |
| 3 | 303.975 |
| 5 | 506.625 |
| 10 | 1,013.25 |
| 20 | 2,026.5 |
| 50 | 5,066.25 |
| 100 | 10,132.5 |
| 500 | 50,662.5 |
| 1,000 | 101,325 |
The formula
To convert atmospheres to kilopascals, multiply the number of atmospheres by 101.325:
kilopascals = atmospheres × 101.325
A worked example
Say a reading is 1.5 atmospheres and you want it in kilopascals:
1.5 × 101.325 = 151.9875 kPa
So 1.5 atmospheres is exactly 151.9875 kilopascals.
Why the number is exact
The "atmosphere" here is the standard atmosphere (atm), which is defined as exactly 101,325 pascals. A kilopascal is just 1,000 pascals, so one atmosphere is exactly 101.325 kPa — an exact conversion, not a rounded one.
When you'll use it
Comparing a pressure quoted in atmospheres against a weather report, a tire chart, or an equipment spec written in kilopascals, which is the everyday metric unit for pressure in much of the world.
Frequently asked questions
How many kilopascals are in one atmosphere?
Exactly 101.325 kilopascals. Since a kilopascal is 1,000 pascals and one atmosphere is exactly 101,325 pascals, the two line up at exactly 101.325 kPa.
Why do weather reports sit near 101 kPa?
Because average sea-level air pressure is about one atmosphere, which is 101.325 kPa. Everyday readings drift a little above or below that with the weather.
Is the atmospheres to kilopascals conversion exact?
Yes. The standard atmosphere is defined as exactly 101,325 pascals, which is exactly 101.325 kilopascals, so nothing is rounded away.