Convert bar to kilopascals
1 bar = 100 kPa
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How many kilopascals are in a bar?
One bar is 100 kilopascals. To convert any amount, multiply by 100. Going the other way, one kilopascal is 0.01 bar.
What is the formula to convert bar to kPa?
Multiply the bar figure by 100. So kPa = bar × 100. For a quick mental estimate, multiplying by about 100 gets you within a percent or so, which is close enough for most everyday purposes.
What does a bar actually look like?
One bar is roughly atmospheric pressure at sea level. One bar is exactly 100,000 pascals, chosen to be close to average atmospheric pressure at sea level. It is the common unit for tyre and diving pressures in Europe.
And what is a kilopascal?
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.
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 bar before converting introduces an error the conversion then multiplies.
About bar to kpa
How to convert bar to kilopascals
Multiply by 100. One bar is 100 kilopascals, and one kilopascal is 0.01 bar.
kPa = bar × 100
Worked example
10 bar = 1000 kPa. For a sense of scale, one bar is roughly atmospheric pressure at sea level, and one kilopascal is a car tyre runs about 220 kPa.
About the bar
One bar is exactly 100,000 pascals, chosen to be close to average atmospheric pressure at sea level. It is the common unit for tyre and diving pressures in Europe.
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.
Quick reference
| bar | kilopascals |
|---|---|
| 1 bar | 100 kPa |
| 2 bar | 200 kPa |
| 5 bar | 500 kPa |
| 10 bar | 1000 kPa |
| 25 bar | 2500 kPa |
| 50 bar | 5000 kPa |
| 100 bar | 10000 kPa |
| 1000 bar | 100000 kPa |
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 bar to a whole number before converting introduces an error that the conversion then multiplies.
Other pressure conversions
Convert kilopascals back to bar, or pick any other pair with the full unit converter. Related: bar to psi, bar to atm.