Pressure
Atmospheres to Hectopascals
Convert atmospheres to hectopascals instantly.
About this conversion
Atmospheres (atm) equal normal air pressure at sea level: 1 atm = 101,325 Pa ≈ 1.013 bar. Hectopascals (hPa) equal millibars (mbar). The standard unit in weather forecasts — normal air pressure is approximately 1,013 hPa. Use the converter above to quickly go from atmospheres to hectopascals.
How to use
Enter a value in the atmospheres field and instantly see the result in hectopascals. Click the swap button to reverse the conversion.
Manual calculation
1 atmospheres = 1,013.3 hectopascals. Example: 10 atm = 10,133 hPa.
Frequently asked questions
How many hectopascals are in 1 atmospheres?
1 Atmospheres equals 1,013.3 hectopascals.
When do you use hectopascals?
Hectopascals (hPa) equal millibars (mbar). The standard unit in weather forecasts — normal air pressure is approximately 1,013 hPa.