Convert atmospheres to bars

1 atm=1.01325bar

Use the converter below to change any atmospheres value into bars instantly — with formula, conversion table, and real-world examples.

You have

Equals

1.01325

Conversion formula

Forward

bars = atmospheres × 1.01325

Reverse

atmospheres = bars × 0.9869

Example: 10 atm × 1.01325 = 10.1325 bar.

About both units

From

Atmosphere

atm

The standard atmosphere equals 101,325 pascals exactly — defined by CGPM in 1954. Represents average sea-level atmospheric pressure. Used in chemistry, aviation and engineering as a reference pressure.

Real-world: Sea-level pressure: 1 atm. Mount Everest summit: ~0.33 atm. Submarine at 100 m: ~11 atm.

Read full atmosphere reference →

Bar

bar

The bar equals 100,000 pascals — slightly less than one atmosphere (1.01325 bar). It is a convenient unit for everyday pressures: tyre pressures, diving depth, weather fronts. Common in European engineering.

Real-world: Car tyre: 2.0–2.5 bar. SCUBA at 10 m depth: 2 bar absolute. Fire hose: 5–7 bar.

Read full bar reference →

Atmosphere to Bar conversion table

Common atmospheres to bars values for quick reference.

Atmosphere (atm)	Bar (bar)
1 atm	1.01325 bar
5 atm	5.06625 bar
10 atm	10.1325 bar
25 atm	25.3313 bar
50 atm	50.6625 bar
100 atm	101.325 bar
200 atm	202.65 bar
500 atm	506.625 bar
1,000 atm	1,013.25 bar
5,000 atm	5,066.25 bar

Tips & common mistakes

Quick tips

1 atm = 101,325 Pa = 1.01325 bar = 14.696 psi.
Note: atm ≠ bar. Close but not identical.
Modern SI prefers pascals; atm is a legacy reference.

Avoid these

Using 1 atm = 1 bar exactly — off by 1.3%.
Confusing standard atm with technical atmosphere (98,066.5 Pa) or atmosphere-absolute in diving.
Applying 1 atm outside sea level without correction.

Frequently asked questions

How many bars in a atmosphere?

One atmosphere equals 1.01325 bars.

How do I convert atmospheres to bars?

Multiply the atmosphere value by 1.01325 to get the equivalent in bars.

What is 100 atmospheres in bars?

100 atmospheres equals 101.325 bars.

Is a atmosphere bigger than a bar?

Yes. 1 atmosphere equals 1.01325 bars, so one atmosphere is larger.

How to convert atmospheres to bars without a calculator?

Multiply by 1.01 for a quick estimate; use a calculator for precise results.

Related pressure conversions

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Convert atmospheres to bars

🧮 Conversion formula