Convert Atmospheres to Kilopascals

About converting Atmospheres to Kilopascals

Atmospheres (atm) and Kilopascals (kPa) are both units of pressure, so converting between them is a single multiplication: multiply your Atmospheres figure by 101.325. Ten Atmospheres comes to 1,013.25 Kilopascals, and a hundred works out at 10,132.5 Kilopascals.

Rule of thumb: going from Atmospheres to Kilopascals multiplies, so the figure always grows — one Atmosphere is already 101.325 Kilopascals. If your answer came out smaller, you have the conversion the wrong way round.

What is an Atmosphere?

The standard atmosphere is a defined reference rather than a working unit: a figure fixed by agreement at roughly what the air presses at sea level on an ordinary day. Nobody sets a gauge to it. Instead it is the yardstick other pressures are described against — divers count depth in atmospheres, chemists specify reactions at one atmosphere, and test standards quote pressures as multiples of it. Because it is a defined number rather than a measured one, the real pressure outside almost never equals exactly one atmosphere; it wanders with the weather, which is what a barometer is telling you.

What is a Kilopascal?

The kilopascal is what the pascal becomes once it is scaled to human problems — a thousand of them, and suddenly the numbers are readable. It is the everyday metric pressure unit across much of the world: tyre pressures in Canada, Australia and New Zealand are posted in kPa, as are the ratings on hydraulics, refrigeration and engineering specifications. Its close relative the hectopascal, a hundred pascals, is what weather services use for air pressure — chosen because it is exactly the size of the millibar forecasters used before it, so every published chart stayed valid.

To put both in perspective: the pressure 10 metres underwater is about 2 atmospheres, while a car tyre is inflated to roughly 220 kilopascals.

The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the Kilopascals to Atmospheres converter, or browse all Pressure converters.