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Hectopascals to Standard Atmospheres Converter

Convert hectopascals (hPa) to standard atmospheres (atm), with the formula, a conversion table and exact factors.

Change the values and press Calculate to work out your own figures.

Enter a pressure, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.

A number, fraction (3/8), mixed number (1 1/2), scientific notation (2.5e6) or a simple sum such as 2*3.
The unit you want the answer in. Swap exchanges the two units.
Result
0.000986923266716 atm
pascals
100 Pa
kilopascals
0.1 kPa
megapascals
0.0001 MPa
bars
0.001 bar
millibars
1 mbar
kilograms-force per square centimeter
0.00101971621298 kgf/cm²
kilograms-force per square meter
10.1971621298 kgf/m²
pounds per square inch
0.014503773773 psi
pounds per square foot
2.08854342332 psf
torr
0.750061682704 Torr
millimeters of mercury (conventional)
0.750061575846 mmHg
inches of mercury (conventional)
0.029529983301 inHg

1 hPa = 0.000986923266716 atm

Show the working
  1. 1 hPa = 0.000986923266716 atm
  2. 1 × 0.000986923266716 = 0.000986923266716 atm

How to convert hectopascals to standard atmospheres

1 hPa = 0.000986923266716 atm, so multiply by 0.000986923266716 to go from hectopascals to standard atmospheres. Going the other way, 1 atm = 1,013.25 hPa.

atm = hPa × 0.000986923266716
hPa = atm × 1,013.25

Worked example:

1 hPa = 0.000986923266716 atm
5 × 0.000986923266716 = 0.00493461633358 atm

Hectopascals to standard atmospheres table

HectopascalsStandard Atmospheres
1 hPa0.000986923266716 atm
2 hPa0.00197384653343 atm
3 hPa0.00296076980015 atm
4 hPa0.00394769306686 atm
5 hPa0.00493461633358 atm
6 hPa0.0059215396003 atm
7 hPa0.00690846286701 atm
8 hPa0.00789538613373 atm
9 hPa0.00888230940044 atm
10 hPa0.00986923266716 atm
15 hPa0.0148038490007 atm
20 hPa0.0197384653343 atm
25 hPa0.0246730816679 atm
30 hPa0.0296076980015 atm
40 hPa0.0394769306686 atm
50 hPa0.0493461633358 atm
75 hPa0.0740192450037 atm
100 hPa0.0986923266716 atm
250 hPa0.246730816679 atm
500 hPa0.493461633358 atm
1000 hPa0.986923266716 atm

About the units

Hectopascals (hPa)
Hectopascals, a metric unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).
Standard Atmospheres (atm)
Standard atmospheres, a specialised unit. Definition: NIST SP 811 Appendix B.8, factors for units listed alphabetically.

Formula version 0.1.0Reviewed