Standard Atmospheres to Bars Converter
1 standard atmosphere = 1.01325 bars
1 standard atmosphere equals 1.01325 bars
How to convert standard atmospheres to bars
Unit conversion preserves the pressure reference. Gauge pressure and absolute pressure are different readings; changing between them also needs the ambient pressure. Mercury and water-column units use the conventions stated in their unit notes.
bar = atm × 1.01325One standard atmosphere is 1.01325 bars, so a single multiplication converts any value.
10.1325 bar = 10 × 1.01325Standard atmospheres to bars conversion table
Common values in standard atmospheres, converted to bars.
| Standard atmospheres (atm) | Bars (bar) |
|---|---|
| 1 | 1.01325 |
| 2 | 2.0265 |
| 3 | 3.03975 |
| 4 | 4.053 |
| 5 | 5.06625 |
| 10 | 10.1325 |
| 20 | 20.265 |
| 25 | 25.33125 |
| 50 | 50.6625 |
| 100 | 101.325 |
| 250 | 253.3125 |
| 500 | 506.625 |
| 1,000 | 1,013.25 |
About these units
standard atmosphereatm
Exactly 101,325 pascals, the defined standard sea-level pressure.
Reference: CGPM 1954.
barbar
Exactly 100,000 pascals, close to average atmospheric pressure at sea level.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.