Convert Bars to Atmospheres
1 bar is 0.986923 atm. One bar is exactly 0.986923266716 atmospheres.
One bar is 0.98692327 atmospheres. To convert bars to atmospheres, multiply by 0.98692327; to go the other way, divide by 0.98692327 or multiply by 1.01325. The factor is exact rather than rounded: it follows from NIST Special Publication 811. Exactly 100,000 pascals by definition, chosen because it sits within a per cent of atmospheric pressure at sea level.
Factor checked against the defining standard · How we check
- Bars × 0.98692327
value * 0.9869232667160.987 atm
1 bar in every pressure unit
| Unit | Value | Exact factor |
|---|---|---|
| pounds per square inch | 14.50377377 psi | × 14.503773773 |
| bars (as entered) | 1 bar | — |
| pascals | 100,000 Pa | × 100,000 |
| kilopascals | 100 kPa | × 100 |
| megapascals | 0.1 MPa | × 0.1 |
| atmospheres | 0.9869232667 atm | × 0.986923266716 |
| torr | 750.0616827 Torr | × 750.061682704 |
| inches of mercury | 29.52998016 inHg | × 29.5299801647 |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert bars to atmospheres?
- 1.Take the measurement in bars.
- 2.Multiply by 0.98692327 — that is how many atmospheres fit in one bar.
- 3.To go back the other way, divide by 0.98692327, or multiply by 1.01325.
Worked example: 25 bars to atmospheres
- Formula
- bar × 0.98692327 = atm
- Arithmetic
- 25 × 0.98692327 = 24.673082 atm
- Answer
- 25 bar = 24.673082 atm
The factor is rounded for display; the figure above is computed from the full value.
Bars to atmospheres conversion table
| Bars | Atmospheres |
|---|---|
| 1 bar | 0.986923 atm |
| 2 bar | 1.973847 atm |
| 3 bar | 2.96077 atm |
| 4 bar | 3.947693 atm |
| 5 bar | 4.934616 atm |
| 6 bar | 5.92154 atm |
| 7 bar | 6.908463 atm |
| 8 bar | 7.895386 atm |
| 9 bar | 8.882309 atm |
| 10 bar | 9.869233 atm |
| 12 bar | 11.843079 atm |
| 15 bar | 14.803849 atm |
| 20 bar | 19.738465 atm |
| 25 bar | 24.673082 atm |
| 50 bar | 49.346163 atm |
| 100 bar | 98.692327 atm |
| 200 bar | 197.384653 atm |
| 300 bar | 296.07698 atm |
| 500 bar | 493.461633 atm |
| 1000 bar | 986.923267 atm |
| 2000 bar | 1,973.846533 atm |
| 5000 bar | 4,934.616334 atm |
| 10000 bar | 9,869.232667 atm |
What is a bar?
Exactly 100,000 pascals by definition, chosen because it sits within a per cent of atmospheric pressure at sea level. European tyre placards and dive computers use it.
What is a standard atmosphere?
Exactly 101,325 pascals by definition, not by measurement — it was fixed as a reference, and the real pressure outside your window is never precisely it.
How many atmospheres are in a bar?
One bar is 0.98692327 atmospheres. Going the other way, one standard atmosphere is 1.01325 bars. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every pressure unit here
| Unit | Symbol | One of these is |
|---|---|---|
| Pounds per square inch | psi | 6894.7573 pascal |
| Bars | bar | 100000 pascal |
| Pascals | Pa | the base unit |
| Kilopascals | kPa | 1000 pascal |
| Megapascals | MPa | 1000000 pascal |
| Atmospheres | atm | 101325 pascal |
| Torr | Torr | 133.32237 pascal |
| Inches of mercury | inHg | 3386.389 pascal |
Questions people actually ask
- How many atmospheres are in a bar?
- 0.98692327. Exactly 101,325 pascals by definition, not by measurement — it was fixed as a reference, and the real pressure outside your window is never precisely it.
- How do I convert atmospheres back to bars?
- Divide by 0.98692327, or multiply by 1.01325 — they are the same operation.
Other pressure conversions
Atmospheres to bars — the same conversion the other way.