🔩 Pressure
atm to bar Converter
Convert atm to bar instantly. Includes a reference table and formula.
Quick answer: To convert atm to bar, multiply by 1.01325. For example, 1 atm = 1.01325 bar. Use the calculator below for any value.
atm to bar
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Common conversions
| atm | bar |
|---|
Formula:
How to convert atm to bar
1
Enter your value
Type the number of atm you want to convert into the left box. The result in bar appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — bar to atm. Your current value carries across so you don't have to re-enter anything.
3
About atm and bar
atm and bar are both pressure. Use this converter to switch between them instantly.
💡 Did you know?
1 atm = 1.01325 bar. For most practical purposes, 1 atm ≈ 1 bar (0.01325 bar difference). SCUBA and industrial gas cylinders are rated in bar; diving tables use atmospheres absolute (ATA). A full scuba cylinder: 200-300 bar = 198-297 atm.
📊 Common conversions at a glance
| atm | bar |
|---|---|
| 0.1 | 0.1013 |
| 0.5 | 0.5066 |
| 1 | 1.013 |
| 1.5 | 1.52 |
| 2 | 2.026 |
| 3 | 3.04 |
Reviewed for 2026. atm ↔ bar conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.