Convert hectopascal to standard atmosphere
Here you can quickly calculate how many standard atmosphere fit in one hectopascal.
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- 1 hPa = 0.000987 atm
- 1 atm = 1013.25 hPa
Example: hectopascal to standard atmosphere
- 1 hectopascal = 0.000987 standard atmosphere
Hectopascal to standard atmosphere conversion table
| hectopascal | standard atmosphere |
|---|---|
| 1 | 0.000987 |
| 2 | 0.001974 |
| 5 | 0.004935 |
| 10 | 0.009869 |
| 20 | 0.019738 |
| 50 | 0.049346 |
| 100 | 0.098692 |
Hectopascal to standard atmosphere formula
To convert hectopascal to standard atmosphere, multiply by 0.000987.
1 hPa = 0.000987 atm
Example: 1 hectopascal = 0.000987 standard atmosphere
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 hectopascal and standard atmosphere conversion quiz
Score:
0
1 standard atmosphere equals 1 010 hectopascal.
Correct answer: 1 standard atmosphere = 1 010 hectopascal.
25 hectopascal equals 0.0247 standard atmosphere.
Correct answer: 25 hectopascal = 0.0247 standard atmosphere.
10 hectopascal equals 0.00987 standard atmosphere.
Correct answer: 10 hectopascal = 0.00987 standard atmosphere.