Atmospheres to Bars (atm to bar) Converter
1 atmosphere (atm) = 1.01325 bars (bar). To convert atmospheres to bars, multiply by 1.01325: 25 atm × 1.01325 = 25.3313 bar.
Quick facts
- 1 atm = 1.01325 bar
- 1 bar = 0.986923 atm
- Formula: bar = atm × 1.01325
- Quick estimate: multiply by about 1
How to convert atmospheres to bars
- Take the value in atmospheres.
- Multiply it by 1.01325 (the number of bars in one atmosphere).
- Round the result to the precision you need.
Worked example: 25 atm × 1.01325 = 25.3313 bar.
To convert bars back to atmospheres, multiply by 0.986923, or divide by 1.01325.
Source: NIST SP 811 (2008), Appendix B.
Atmospheres to Bars conversion table
| Atmospheres [atm] | Bars [bar] |
|---|---|
| 0.01 atm | 0.0101325 bar |
| 0.1 atm | 0.101325 bar |
| 1 atm | 1.01325 bar |
| 2 atm | 2.0265 bar |
| 3 atm | 3.03975 bar |
| 5 atm | 5.06625 bar |
| 10 atm | 10.1325 bar |
| 20 atm | 20.265 bar |
| 50 atm | 50.6625 bar |
| 100 atm | 101.325 bar |
| 1000 atm | 1013.25 bar |
atm to bar chart from 1 to 100
- 1 atm 1.01325 bar
- 2 atm 2.0265 bar
- 3 atm 3.03975 bar
- 4 atm 4.053 bar
- 5 atm 5.06625 bar
- 6 atm 6.0795 bar
- 7 atm 7.09275 bar
- 8 atm 8.106 bar
- 9 atm 9.11925 bar
- 10 atm 10.1325 bar
- 11 atm 11.1458 bar
- 12 atm 12.159 bar
- 13 atm 13.1723 bar
- 14 atm 14.1855 bar
- 15 atm 15.1988 bar
- 16 atm 16.212 bar
- 17 atm 17.2253 bar
- 18 atm 18.2385 bar
- 19 atm 19.2518 bar
- 20 atm 20.265 bar
- 25 atm 25.3313 bar
- 30 atm 30.3975 bar
- 35 atm 35.4638 bar
- 40 atm 40.53 bar
- 45 atm 45.5963 bar
- 50 atm 50.6625 bar
- 55 atm 55.7288 bar
- 60 atm 60.795 bar
- 65 atm 65.8613 bar
- 70 atm 70.9275 bar
- 75 atm 75.9938 bar
- 80 atm 81.06 bar
- 85 atm 86.1263 bar
- 90 atm 91.1925 bar
- 95 atm 96.2588 bar
- 100 atm 101.325 bar
Bars to Atmospheres conversion table
| Bars [bar] | Atmospheres [atm] |
|---|---|
| 0.01 bar | 0.0098692327 atm |
| 0.1 bar | 0.0986923267 atm |
| 1 bar | 0.9869232667 atm |
| 2 bar | 1.9738465334 atm |
| 3 bar | 2.9607698001 atm |
| 5 bar | 4.9346163336 atm |
| 10 bar | 9.8692326672 atm |
| 20 bar | 19.7384653343 atm |
| 50 bar | 49.3461633358 atm |
| 100 bar | 98.6923266716 atm |
| 1000 bar | 986.923266716 atm |
Atmospheres vs Bars
| Atmosphere | Bar | |
|---|---|---|
| Symbol | atm | bar |
| Equals | 1 atm = 1.01325 bar | 1 bar = 0.986923 atm |
What is an atmosphere?
Defined as standard atmospheric pressure at sea level. Used as a reference pressure in science and diving.
What is a bar?
Approximately equal to atmospheric pressure at sea level. Used in meteorology and for tire and hydraulic pressure.
Frequently asked questions
How many bars are in an atmosphere?
There are 1.01325 bars in 1 atmosphere (1 atm = 1.01325 bar).
How many atmospheres are in a bar?
There are 0.986923 atmospheres in 1 bar (1 bar = 0.9869232667 atm).
How do I convert atmospheres to bars?
Multiply the number of atmospheres by 1.01325. For example, 10 atm × 1.01325 = 10.1325 bar. To convert back, multiply by 0.986923.
What is 10 atm in bars?
10 atm = 10.1325 bar.
What is 100 atm in bars?
100 atm = 101.325 bar.
Is the conversion exact?
Yes. The factor comes from the official definitions of both units (NIST SP 811 (2008), Appendix B). Results are shown to up to 10 decimal places; round them to suit your purpose.
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