Convert Kilopascals to Atmospheres
Kilopascals to atmospheres is the conversion you need when a pressure is given in kPa but you want it as a multiple of everyday sea-level air pressure. One kilopascal is approximately 0.00986923 atmospheres, so the atmosphere number always comes out much smaller.
Kilopascals to Atmospheres conversion table
| Kilopascals (kPa) | Atmospheres (atm) |
|---|---|
| 1 | 0.009869 |
| 2 | 0.019738 |
| 3 | 0.029608 |
| 5 | 0.049346 |
| 10 | 0.098692 |
| 20 | 0.197385 |
| 50 | 0.493462 |
| 100 | 0.986923 |
| 500 | 4.934616 |
| 1,000 | 9.869233 |
The formula
To convert kilopascals to atmospheres, multiply the number of kilopascals by 0.009869232667160128:
atmospheres = kilopascals × 0.009869232667160128
A worked example
Say you have a reading of 101.325 kPa and want it in atmospheres:
101.325 kPa = 1 atm (exactly)
So 101.325 kilopascals is exactly one standard atmosphere — the defined sea-level reference.
Why it's an approximation
The standard atmosphere is defined as exactly 101,325 pascals, which is exactly 101.325 kilopascals — so that one anchor point is exact. But a single kilopascal doesn't divide evenly into that total, which leaves a long factor, 0.009869232667160128, that never settles into a clean fraction. So while 101.325 kPa hits 1 atm exactly, the per-kilopascal number you multiply by is rounded, and any other value stays approximate.
When you'll use it
Expressing a pressure in kPa as a multiple of normal sea-level air pressure — handy in weather, chemistry, diving, and physics — or comparing a metric gauge reading against the familiar "1 atmosphere" benchmark.
Frequently asked questions
How many atmospheres are in a kilopascal?
About 0.00986923 atmospheres. It's a rounded figure — the exact value runs on past several decimal places, so 0.00986923 is the practical number to use.
How many kilopascals are in one atmosphere?
One standard atmosphere is defined as exactly 101,325 pascals, which is exactly 101.325 kPa. So 101.325 kPa equals 1 atm exactly, even though a single kilopascal is a rounded fraction of an atmosphere.
Is the kilopascals to atmospheres conversion exact?
The reference point is exact — 101.325 kPa is exactly 1 atm — but the per-kilopascal factor 0.009869232667160128 is rounded, since one kilopascal doesn't land on a tidy fraction of an atmosphere.