How many bar are in one atm?
One standard atmosphere equals exactly 1.01325 bar.
Convert Standard atmosphere (atm) to Bar (bar) instantly.
Formula
value × 1.01325
| Sample | Converted |
|---|---|
| 1 atm | 1.01325 bar |
| 5 atm | 5.06625 bar |
| 10 atm | 10.1325 bar |
| 100 atm | 101.325 bar |
| 1,000 atm | 1,013.25 bar |
Convert standard atmospheres to bar by multiplying the atm value by 1.01325. This is useful when an atmosphere-reference pressure needs to be compared with gauges, compressors, pumps, or industrial equipment that use bar.
atm is a fixed pressure reference, while bar is a practical unit used on many gauges and industrial systems.
This conversion is helpful when scientific or gas-law values need to be compared with equipment pressure units.
One standard atmosphere is exactly 1.01325 bar, so the bar result is slightly larger than the atm value.
Use atm when the relationship to standard atmosphere matters and bar when matching practical equipment documentation.
Do not treat local air pressure as exactly one atm unless that is the defined reference in the problem.
For gauge readings, keep gauge or absolute context separate from the unit conversion.
Atmospheres are common in science and gas-law contexts, while bar is common in equipment and industrial pressure references.
Converting atm to bar lets the same pressure be compared with gauges, pumps, compressors, and process documentation.
This is useful when a reference-pressure value has to be used in practical pressure work.
One atm is 101,325 Pa.
One bar is 100,000 Pa.
That makes one atm exactly 1.01325 bar.
atm is a defined standard reference.
bar can describe gauge or absolute pressure depending on the source.
Keep the pressure reference visible when comparing converted values.
Definition: A standard atmosphere is a pressure unit defined as exactly 101,325 pascals.
History/Origin: The atmosphere unit became useful as a reference for average sea-level air pressure in science and education.
Current use: atm is used in chemistry, gas laws, diving references, laboratory work, classroom problems, and pressure comparisons.
Definition: A bar is a pressure unit equal to 100,000 pascals.
History/Origin: Bar became widely used because it is close to atmospheric pressure and convenient for many practical pressure ranges.
Current use: bar is used in compressors, pumps, hydraulics, industrial equipment, diving, process systems, and pressure gauges.
| Standard atmosphere [atm] | Bar [bar] |
|---|---|
| 0.01 atm | 0.010133 bar |
| 0.1 atm | 0.101325 bar |
| 1 atm | 1.01325 bar |
| 2 atm | 2.0265 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 |
1 atm = 1.01325 bar
1 bar = 0.986923 atm
Formula: value × 1.01325
Example: 15 atm = 15.19875 bar
Precision note: Use exactly 1.01325 bar per atm. Preserve decimals when converting values near one atmosphere.
One standard atmosphere equals exactly 1.01325 bar.
2 atm equals 2.0265 bar.
No. They are close, but one atm is slightly higher than one bar.