Convert standard atmosphere to millibar
Here you can quickly calculate how many millibar fit in one standard atmosphere.
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- 1 atm = 1013.25 mbar
- 1 mbar = 0.000987 atm
Example: standard atmosphere to millibar
- 1 standard atmosphere = 1013.25 millibar
Standard atmosphere to millibar conversion table
| standard atmosphere | millibar |
|---|---|
| 1 | 1013.25 |
| 2 | 2026.5 |
| 5 | 5066.25 |
| 10 | 10132.5 |
| 20 | 20265 |
| 50 | 50662.5 |
| 100 | 101325 |
Standard atmosphere to millibar formula
To convert standard atmosphere to millibar, multiply by 1013.25.
1 atm = 1013.25 mbar
Example: 1 standard atmosphere = 1013.25 millibar
Common pressure conversion mistakes
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One atmosphere is not exactly one bar: 1 atm = 1.01325 bar = 101.325 kPa. There is also the technical atmosphere (1 kgf/cm²) at about 0.981 bar. The ~1% differences rarely matter day to day, but engineering and diving calculations need the right unit.
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Blood pressure uses mmHg (120/80) and weather reports use hPa (around 1,013), different units that must not be mixed: 760 mmHg = 1,013.25 hPa. One mmHg is about 1.33 hPa.
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Hectopascals and millibars are exactly the same size: 1 hPa = 1 mbar. A chart showing 1,013 mbar and one showing 1,013 hPa agree perfectly, no conversion needed. Meteorology simply renamed the unit.
Quick standard atmosphere and millibar conversion quiz
Score:
0
100 standard atmosphere equals 1.01e+5 millibar.
Correct answer: 100 standard atmosphere = 1.01e+5 millibar.
10 millibar equals 0.0493 standard atmosphere.
Correct answer: 10 millibar = 0.00987 standard atmosphere.
25 standard atmosphere equals 5.07e+3 millibar.
Correct answer: 25 standard atmosphere = 2.53e+4 millibar.