Atmospheres to Bar Converter
Quick answer: To convert atmospheres to bar, multiply by 1.01325. For example, 10 atm is 10.1325 bar. One standard atmosphere equals 1.01325 bar.
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Use the Atmospheres to Bar Converter
Atmospheres to Bar formula and what each symbol means
bar = atm × 1.01325
| Symbol | Meaning |
|---|---|
| atm | Standard atmosphere |
| bar | Bar |
Atmospheres to Bar examples
1 atm
1 atm × 1.01325 = 1.01325 bar.
10 atm
10 atm × 1.01325 = 10.1325 bar.
100 atm
100 atm × 1.01325 = 101.325 bar.
Atmospheres compared with Bar
One atm is 1.013 times as large as one bar, so your number gets bigger when you convert atmospheres to bar and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
About atmospheres and bar
Standard atmosphere (atm): Standard atmosphere, exactly 101,325 pascals. Bar (bar): Exactly 100,000 pascals.
Where atmospheres to bar conversions are used
Hydraulics, boilers and pneumatic tools list their limits in bar, psi or MPa. Tyre pressure is shown in psi, bar or kPa, depending on the vehicle and country.
How to calculate Atmospheres to Bar step by step
- Enter the value in atm (the starting unit).
- Multiply by 1.01325, because 1 atm = 1.01325 bar.
- The product is the value in bar. To go back, divide by 1.01325 or multiply by 0.9869233.
Popular pressure conversions
How to read your Atmospheres to Bar result
The pascal is the SI unit, but gauges use bar, psi, atmospheres or mmHg depending on the field.
| ATMOSPHERES | BAR |
|---|---|
| 1 | 1.01325 |
| 2 | 2.0265 |
| 5 | 5.06625 |
| 10 | 10.1325 |
| 20 | 20.265 |
| 50 | 50.6625 |
| 100 | 101.325 |
| 1,000 | 1,013.25 |
Bar to Atmospheres: quick table
| BAR | ATMOSPHERES |
|---|---|
| 1 | 0.9869233 |
| 5 | 4.934616 |
| 10 | 9.869233 |
| 25 | 24.67308 |
| 50 | 49.34616 |
| 100 | 98.69233 |
| 250 | 246.7308 |
| 500 | 493.4616 |
Common mistakes when calculating Atmospheres to Bar
- Reading mmHg and Torr as clearly different units: they differ by only about one part in seven million.
- Dividing when you should multiply: from atm to bar multiply by 1.01325; from bar to atm divide by 1.01325.
Atmospheres to Bar FAQ
How many bar are in 1 atm?
1 atm equals 1.01325 bar.
How many atm are in 1 bar?
1 bar equals 0.9869233 atm.
Is 1 atm = 1.01325 bar an exact conversion?
Yes. The standard atmosphere and the bar are both defined exactly in SI terms, so the ratio has no measurement uncertainty; 1.01325 is just that ratio shown to 7 significant figures.
What is a standard atmosphere (atm)?
Standard atmosphere, exactly 101,325 pascals.
How can I estimate atmospheres to bar in my head?
One atm is 1.013 times as large as one bar, so your number gets bigger when you convert atmospheres to bar and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
What is 80 atm in bar?
80 atm = 81.06 bar (since 80 × 1.01325).
What is 500 atm in bar?
500 atm = 506.625 bar (since 500 × 1.01325).
What is 15 atm in bar?
15 atm = 15.19875 bar (since 15 × 1.01325).
How many decimals should I keep when converting atm to bar?
Match the precision of your original measurement. For example, 10.1325 bar rounds to 10.1 bar at 3 significant figures; keep more digits only for engineering or scientific work.
More in Pressure converters
- Atmospheres to Pascals Converter
- PSI to kPa Converter
- Atmospheres to PSI Converter
- PSI to Bar Converter
- PSI to Atmospheres Converter
- Bar to kPa Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the SI derived units