Feedback form

Bar to atm

Convert Bar to atm

"Bar to atm" Calculator

How to convert bars to atmospheres

Worked example: 1 bar ≈ 0.99 atm

1 bar ÷ 1.01325 ≈ 0.99 atm

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

Most asked values
Bars	Atmospheres
1 bar	0.99 atm
1.5 bar	1.48 atm
2 bar	1.97 atm
2.2 bar	2.17 atm
2.5 bar	2.47 atm
3 bar	2.96 atm
4 bar	3.95 atm
5 bar	4.93 atm
6 bar	5.92 atm
8 bar	7.9 atm
9 bar	8.88 atm
10 bar	9.87 atm
15 bar	14.8 atm
16 bar	15.79 atm
20 bar	19.74 atm
25 bar	24.67 atm
30 bar	29.61 atm
40 bar	39.48 atm
200 bar	197.38 atm
300 bar	296.08 atm

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
atm to Bar - Convert atm to Bar
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

Last Results

FAQ

How many atm is 1 bar?

1 bar ≈ 0.986923 atm. The exact relation goes the other way: 1 atm = 1.01325 bar, so atm = bar ÷ 1.01325.

Is a bar the same as an atmosphere?

No, but they are close: 1 atm = 1.01325 bar exactly, so a bar is about 1.3% smaller. For a tire or a scuba tank the difference rarely matters; in a lab it does.

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.

Gauge or absolute pressure: does it matter?

No, as long as both sides are of the same kind. Gauge pressure (barg) counts from the surrounding air, absolute pressure (bara) from vacuum, and the factor is the same for both. Tire and compressor gauges show gauge pressure.