Convert Hectopascal to Atmosphere
Type the number of hectopascals that you wish to convert to atmospheres.
How to Convert Hectopascals to Atmospheres
The hectopascal and atmosphere are both units of pressure. 1 atmosphere equals 1013.25 hectopascals. This means to convert hectopascals to atmospheres, you divide by 1013.25.
Formula
Step-by-Step Example
Convert 5 hPa to atmospheres:
We need to convert hectopascals to atmospheres
Since 1 atm = 1013.25 hPa, divide by 1013.25
5 ÷ 1013.25 = 0.0049346163
5 hPa = 0.0049346163 atm
Hectopascal to Atmosphere Conversion Table
Quick reference table for common hectopascal to atmosphere conversions. Click any value for detailed calculation.
| Hectopascals (hPa) | Atmospheres (atm) |
|---|---|
| 0.1 hPa | 9.8692326672e-5 atm |
| 0.5 hPa | 0.0004934616 atm |
| 1 hPa | 0.0009869233 atm |
| 2 hPa | 0.0019738465 atm |
| 5 hPa | 0.0049346163 atm |
| 10 hPa | 0.0098692327 atm |
| 25 hPa | 0.0246730817 atm |
| 50 hPa | 0.0493461633 atm |
| 100 hPa | 0.0986923267 atm |
About These Units
Hectopascal (hPa)
A hectopascal (hPa) equals 100 Pascals and is identical to one millibar. Hectopascals are the standard unit for atmospheric pressure in meteorology and aviation worldwide. Standard sea level pressure is 1013.25 hPa. Weather maps display pressure in hPa.
Atmosphere (atm)
One standard atmosphere (atm) equals 101,325 Pascals, 1.01325 bar, or 14.696 PSI—the average air pressure at sea level. Atmospheres measure diving depth (every 10 meters adds ~1 atm), altitude effects, and chemical reactions. Used as a reference pressure in science.
Frequently Asked Questions
How do I convert hectopascals to atmospheres?
To convert hectopascals to atmospheres, divide the value by 1013.25. For example, 10 hPa = 0.0098692327 atm.
How many atmospheres are in 1 hectopascal?
1 hectopascal equals 0.0009869233 atmospheres.
What is the formula for hectopascals to atmospheres?
The formula is: atm = hPa ÷ 1013.25.