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atm to Bar

Convert atm to Bar

"atm to Bar" Calculator

How to convert atmospheres to bars

Worked example: 1 atm ≈ 1.01 bar

1 atm × 1.01325 ≈ 1.01 bar

Rule: bars = atmospheres × 1.01325 — exact: 1 atm = 1.01325 bar.

Most asked values
Atmospheres	Bars
0.2 atm	0.2 bar
0.25 atm	0.25 bar
0.5 atm	0.51 bar
1 atm	1.01 bar
1.5 atm	1.52 bar
2 atm	2.03 bar
2.3 atm	2.33 bar
2.5 atm	2.53 bar
3 atm	3.04 bar
3.5 atm	3.55 bar
4 atm	4.05 bar
5 atm	5.07 bar
6 atm	6.08 bar
8 atm	8.11 bar
10 atm	10.13 bar
12 atm	12.16 bar
15 atm	15.2 bar
20 atm	20.27 bar
50 atm	50.66 bar
100 atm	101.33 bar

See Also

Bar to PSI - Convert Bar to PSI
PSI to Bar - Convert PSI to Bar
kPa to PSI - Convert kPa to PSI
MPa to kgf/cm² - Convert MPa to kgf/cm²
MPa to PSI - Convert MPa to PSI
PSI to kPa - Convert PSI to kPa
Bar to atm - Convert Bar to atm
Newton-Meters to Foot-Pounds - Convert Newton-Meters to Foot-Pounds
Foot-Pounds to Newton-Meters - Convert Foot-Pounds to Newton-Meters
Newton-Meters to Inch-Pounds - Convert Newton-Meters to Inch-Pounds
Inch-Pounds to Newton-Meters - Convert Inch-Pounds to Newton-Meters

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FAQ

How many bar is 1 atm?

1 atm = 1.01325 bar exactly, so bar = atm × 1.01325. Answers are rounded to two decimals (below 0.1 bar, to three significant figures): 1 atm shows as ≈ 1.01 bar.

Is 1 atm the air pressure outside?

Only on average. The standard atmosphere is a fixed value, 101,325 Pa, close to the mean air pressure at sea level. The real air pressure changes with the weather and drops with altitude, so a barometer rarely reads exactly 1 atm.

Where does 1.01325 come from?

Both units are defined in pascals: the standard atmosphere is exactly 101,325 Pa (General Conference on Weights and Measures, 1954), and a bar is exactly 100,000 Pa. 101,325 ÷ 100,000 = 1.01325, a terminating decimal, so the factor is exact.