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. 1,013.3 hectopascals equal 1 Atmospheres. The converter above calculates the result instantly — you can also swap the units to convert in the other direction.
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 do you convert hectopascals to atmospheres?
Divide the number of hectopascals by 1,013.3 to get atmospheres. Example: 10,000 hPa ÷ 1,013.3 = 9.8692 atm.
Are hectopascals bigger or smaller than atmospheres?
Hectopascals is smaller than Atmospheres. There are 1,013.3 hectopascals in one atmosphere, so the result is a smaller number when converting from hectopascals to atmospheres.
What is 1,000 hectopascals in atmospheres?
1,000 hPa equals 0.98692 atm.
How many hectopascals are in 1 atmosphere?
1 atm equals 1,013.3 hPa. This is the reverse conversion — useful if you have a value in atmospheres and want it in hectopascals.
What is hectopascal?
Hectopascals (hPa) equal millibars (mbar). The standard unit in weather forecasts — normal air pressure is approximately 1,013 hPa.
What is atmosphere used for?
Atmospheres (atm) equal normal air pressure at sea level: 1 atm = 101,325 Pa ≈ 1.013 bar.