How do I convert atm to bar?

Multiply atm by 1.01325 to get bar. Example: 2 atm × 1.01325 = 2.0265 bar. To convert bar to atm: divide by 1.01325.

atm to Bar Converter

Q: How many bar is 1 atm?

1 atm = 1.01325 bar. 1 atm is standard atmospheric pressure at sea level = 101.325 kPa = 14.696 psi = 1.01325 bar.

Q: What is the difference between atm and bar?

1 atm (standard atmosphere) = 1.01325 bar. They are very close but not equal. Bar is a metric unit defined as exactly 100,000 Pa. Atm is based on average atmospheric pressure at sea level.

1 atm = 1.01325 bar

1 atm =

1.01325

bar

1 atm = 101.325 kPa = 14.696 psi

In kPa101.325 kPa

In PSI14.696 psi

In Pa101,325 Pa

1 bar in atm0.986923 atm

Enter atmospheres:

atm =bar

Common values

1 atm 2 atm 3 atm 5 atm 10 atm 20 atm 50 atm 100 atm

How to Convert atm to Bar

Bar = atm × 1.01325

1 standard atmosphere = 1.01325 bar exactly

atm = Bar ÷ 1.01325

To convert bar back to atmospheres

1 atm in bar1.01325 bar

1 atm in kPa101.325 kPa

1 atm in PSI14.696 psi

1 bar in atm0.986923 atm

💡

atm vs bar: 1 atm and 1 bar are almost equal (only 1.3% difference). Bar is easier to use in calculations since 1 bar = 100,000 Pa exactly. Atm is based on real-world atmospheric pressure at sea level.

atm to Bar Reference Table

atm	Bar	PSI	kPa
0.5 atm	0.507 bar	7.35 psi	50.7 kPa
1 atm	1.013 bar	14.7 psi	101.3 kPa
1.5 atm	1.52 bar	22.04 psi	152 kPa
2 atm	2.027 bar	29.39 psi	202.7 kPa
2.5 atm	2.533 bar	36.74 psi	253.3 kPa
3 atm	3.04 bar	44.09 psi	304 kPa
4 atm	4.053 bar	58.78 psi	405.3 kPa
5 atm	5.066 bar	73.48 psi	506.6 kPa
6 atm	6.08 bar	88.18 psi	608 kPa
7 atm	7.093 bar	102.87 psi	709.3 kPa
8 atm	8.106 bar	117.57 psi	810.6 kPa
9 atm	9.119 bar	132.26 psi	911.9 kPa
10 atm	10.133 bar	146.96 psi	1013.3 kPa
15 atm	15.199 bar	220.44 psi	1519.9 kPa
20 atm	20.265 bar	293.92 psi	2026.5 kPa
30 atm	30.398 bar	440.88 psi	3039.8 kPa
50 atm	50.663 bar	734.8 psi	5066.3 kPa
100 atm	101.325 bar	1469.6 psi	10132.5 kPa

Pressure Units Comparison

Unit	= 1 atm	Definition
atm	1 atm	Standard atmosphere (sea level)
bar	1.01325 bar	Metric: 100,000 Pa exactly
kPa	101.325 kPa	Kilopascals (SI unit)
Pa	101,325 Pa	Pascals (N/m²)
PSI	14.696 psi	Pounds per square inch (US)
mmHg (Torr)	760 mmHg	Millimeters of mercury

Frequently Asked Questions

How many bar is 1 atm?

1 atm = 1.01325 bar exactly. Standard atmosphere (atm) is defined as the pressure at sea level = 101,325 Pa = 1.01325 bar.

What is the difference between atm and bar?

1 bar = 100,000 Pa exactly. 1 atm = 101,325 Pa. They differ by about 1.3%. Bar is the preferred metric unit; atm is used in chemistry and gas laws.

How many atm is 10 bar?

10 bar = 9.869 atm. Divide 10 by 1.01325 = 9.869 atm. Common in diving: 10 bar water pressure = ~100 meters depth.

What is STP in atm and bar?

Standard Temperature and Pressure (STP) in chemistry: 1 atm and 0°C (old definition) or 1 bar and 0°C (IUPAC 1982 definition). Always check which standard is being used.

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