Pressure
Hectopascals to Atmospheres
Convert hectopascals to atmospheres instantly.
About this conversion
Hectopascals (hPa) equal millibars (mbar). The standard unit in weather forecasts — normal air pressure is approximately 1,013 hPa. Atmospheres (atm) equal normal air pressure at sea level: 1 atm = 101,325 Pa ≈ 1.013 bar. Use the converter above to quickly go from hectopascals to atmospheres.
How to use
Enter a value in the hectopascals field and instantly see the result in atmospheres. Click the swap button to reverse the conversion.
Manual calculation
1 hectopascals = 0.00098692 atmospheres. Example: 10 hPa = 0.0098692 atm.
Frequently asked questions
How many atmospheres are in 1 hectopascals?
1 Hectopascals equals 0.00098692 atmospheres.
When do you use atmospheres?
Atmospheres (atm) equal normal air pressure at sea level: 1 atm = 101,325 Pa ≈ 1.013 bar.