Convert Atmospheres to Bar
One atmosphere equals 1.01325 bar. Type any value to convert atmospheres to bar instantly — with a full reference table below.
Convert Atmospheres to Bar
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How to convert Atmospheres to Bar
To convert atmospheres to bar, multiply by 1.01325. One atmosphere equals 1.01325 bar, and one bar equals 0.986923 atm.
- Take the value in atmospheres — for example 7.5 atm.
- Multiply by 1.01325 (the number of bar in one atmosphere).
- 7.5 × 1.01325 = 7.599375 bar.
Quick mental estimate: Multiply the number of atmospheres by 1 (within 1.3% of the exact answer).
Atmospheres to Bar conversion table
| Atmospheres | Bar |
|---|---|
| 1 atm | 1.01325 bar |
| 2 atm | 2.0265 bar |
| 5 atm | 5.06625 bar |
| 10 atm | 10.1325 bar |
| 15 atm | 15.19875 bar |
| 20 atm | 20.265 bar |
| 30 atm | 30.3975 bar |
| 32 atm | 32.424 bar |
| 40 atm | 40.53 bar |
| 50 atm | 50.6625 bar |
| 100 atm | 101.325 bar |
| Bar | Atmospheres |
|---|---|
| 1 bar | 0.986923 atm |
| 2 bar | 1.973847 atm |
| 5 bar | 4.934616 atm |
| 10 bar | 9.869233 atm |
| 15 bar | 14.80385 atm |
| 20 bar | 19.73847 atm |
| 30 bar | 29.6077 atm |
| 32 bar | 31.58154 atm |
| 40 bar | 39.47693 atm |
| 50 bar | 49.34616 atm |
| 100 bar | 98.69233 atm |
About converting Atmospheres to Bar
Atmospheres (atm) and Bar (bar) are both units of pressure. The exact factor is 1 atm = 1.01325 bar, so multiply by 1.01325 to go from atmospheres to bar (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Bar to Atmospheres converter, or the full unit converter for every unit at once.
Real-world pressure in atmospheres and bar
| Example | Atmospheres | Bar |
|---|---|---|
| A systolic blood pressure of 120 mmHg | 0.157895 atm | 0.159987 bar |
| A pressure cooker's over-pressure (15 psi) | 1.020689 atm | 1.034214 bar |
| The standard atmosphere | 1 atm | 1.01325 bar |
| A typical car tyre (32 psi) | 2.177471 atm | 2.206322 bar |
| An espresso machine (9 bar) | 8.882309 atm | 9 bar |
| A road-bike tyre (90 psi) | 6.124137 atm | 6.205282 bar |
| A scuba cylinder (200 bar) | 197.3847 atm | 200 bar |
“≈” marks typical values; the rest are defined or measured figures.
The units
The standard atmosphere: exactly 101,325 Pa, average sea-level air pressure.
Used for: Chemistry, diving and physics.
Exactly 100,000 Pa — very close to atmospheric pressure at sea level.
Used for: Tyre pressure in Europe and India, scuba, espresso machines.
The bar (100,000 Pa) and the standard atmosphere (101,325 Pa) are exact; psi is derived from the pound-force and the inch, so its factor is a rounded value of an exact fraction.