Convert bars to atmospheres

1 bar=0.9869atm

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

You have

Equals

0.98692

Conversion formula

Forward

atmospheres = bars × 0.9869

Reverse

bars = atmospheres × 1.01325

Example: 10 bar × 0.9869 = 9.86923 atm.

About both units

From

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

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 to Atmosphere conversion table

Common bars to atmospheres values for quick reference.

Bar (bar)	Atmosphere (atm)
1 bar	0.9869 atm
5 bar	4.93462 atm
10 bar	9.86923 atm
25 bar	24.6731 atm
50 bar	49.3462 atm
100 bar	98.6923 atm
200 bar	197.385 atm
500 bar	493.462 atm
1,000 bar	986.923 atm
5,000 bar	4,934.62 atm

Tips & common mistakes

Quick tips

1 bar = 100 kPa = 0.987 atm = 14.5 psi.
Almost 1 atm — convenient approximation.
Tyre pressures: 2.0–2.5 bar typical car, 6–10 bar truck.

Avoid these

Assuming 1 bar = 1 atm exactly — 1.3% off.
Mixing bar with psi — need factor of 14.5.
Using bar for high-pressure work — switch to MPa.

Frequently asked questions

How many atmospheres in a bar?

One bar equals 0.9869 atmospheres.

How do I convert bars to atmospheres?

Multiply the bar value by 0.9869 to get the equivalent in atmospheres.

What is 100 bars in atmospheres?

100 bars equals 98.6923 atmospheres.

Is a bar bigger than a atmosphere?

No. 1 bar equals 0.9869 atmospheres, so one bar is smaller.

How to convert bars to atmospheres without a calculator?

Multiply by 0.99 for a quick estimate; use a calculator for precise results.

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Convert bars to atmospheres

🧮 Conversion formula