Hectopascals to Atmospheres Converter

Enter the pressure in hectopascals below to convert it to atmospheres.

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Result in Atmospheres:

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1 hPa = 0.000987 atm

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How to Convert Hectopascals to Atmospheres

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To convert a measurement in hectopascals to a measurement in atmospheres, multiply the pressure by the following conversion ratio: 0.000987 atmospheres/hectopascal.

Since one hectopascal is equal to 0.000987 atmospheres, you can use this simple formula to convert:

atmospheres = hectopascals × 0.000987

The pressure in atmospheres is equal to the pressure in hectopascals multiplied by 0.000987.

For example, here's how to convert 5,000 hectopascals to atmospheres using the formula above.
atmospheres = (5,000 hPa × 0.000987) = 4.934616 atm

Hectopascals and atmospheres are both units used to measure pressure. Keep reading to learn more about each unit of measure.

What Is a Hectopascal?

The hectopascal is equal to 100 pascals, which are defined as the pressure of one newton per square meter. The hectopascal is the internationally adopted unit used to measure atmospheric pressure.

The hectopascal is a multiple of the pascal, which is the SI derived unit for pressure. In the metric system, "hecto" is the prefix for 102. Hectopascals can be abbreviated as hPa; for example, 1 hectopascal can be written as 1 hPa.

Learn more about hectopascals.

What Is an Atmosphere?

The atmosphere is a reference measure of pressure equal to 101,325 pascals or 1,013,250 dynes. The atmosphere was originally defined as the pressure of 760 millimeters of mercury at standard gravity at 0 °C, but was later redefined in 1954 to be equal to 1,013,250 dynes.

Atmospheres can be abbreviated as atm; for example, 1 atmosphere can be written as 1 atm.

Learn more about atmospheres.

Hectopascal to Atmosphere Conversion Table

Table showing various hectopascal measurements converted to atmospheres.
Hectopascals Atmospheres
1 hPa 0.000987 atm
2 hPa 0.001974 atm
3 hPa 0.002961 atm
4 hPa 0.003948 atm
5 hPa 0.004935 atm
6 hPa 0.005922 atm
7 hPa 0.006908 atm
8 hPa 0.007895 atm
9 hPa 0.008882 atm
10 hPa 0.009869 atm
20 hPa 0.019738 atm
30 hPa 0.029608 atm
40 hPa 0.039477 atm
50 hPa 0.049346 atm
60 hPa 0.059215 atm
70 hPa 0.069085 atm
80 hPa 0.078954 atm
90 hPa 0.088823 atm
100 hPa 0.098692 atm
200 hPa 0.197385 atm
300 hPa 0.296077 atm
400 hPa 0.394769 atm
500 hPa 0.493462 atm
600 hPa 0.592154 atm
700 hPa 0.690846 atm
800 hPa 0.789539 atm
900 hPa 0.888231 atm
1,000 hPa 0.986923 atm
2,000 hPa 1.9738 atm
3,000 hPa 2.9608 atm
4,000 hPa 3.9477 atm
5,000 hPa 4.9346 atm
6,000 hPa 5.9215 atm
7,000 hPa 6.9085 atm
8,000 hPa 7.8954 atm
9,000 hPa 8.8823 atm
10,000 hPa 9.8692 atm

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