atm to hPa Converter

How to convert atmospheres to hectopascals

FormulahPa = atm × 1,013.25

Multiply the value in atmospheres by 1,013.25. To go the other way, multiply by 0.0009869232667 (or divide by 1,013.25).

A standard atmosphere is larger than a hectopascal: one standard atmosphere contains 1,013.25 hectopascals.

Worked examples

1 standard atmosphere1 atm × 1,013.25 = 1,013.25 hPa
5 atmospheres5 atm × 1,013.25 = 5,066.25 hPa
10 atmospheres10 atm × 1,013.25 = 10,132.5 hPa
20 atmospheres20 atm × 1,013.25 = 20,265 hPa
100 atmospheres100 atm × 1,013.25 = 101,325 hPa

Atmospheres to hectopascals conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Atmospheres to hectopascals: 0.1–10 atm
Atmospheres (atm)	Hectopascals (hPa)
0.1 atm	101.325 hPa
0.25 atm	253.3125 hPa
0.5 atm	506.625 hPa
1 atm	1,013.25 hPa
2 atm	2,026.5 hPa
3 atm	3,039.75 hPa
4 atm	4,053 hPa
5 atm	5,066.25 hPa
6 atm	6,079.5 hPa
7 atm	7,092.75 hPa
8 atm	8,106 hPa
9 atm	9,119.25 hPa
10 atm	10,132.5 hPa

Atmospheres to hectopascals: 12–1,000 atm
Atmospheres (atm)	Hectopascals (hPa)
12 atm	12,159 hPa
15 atm	15,198.75 hPa
20 atm	20,265 hPa
25 atm	25,331.25 hPa
30 atm	30,397.5 hPa
40 atm	40,530 hPa
50 atm	50,662.5 hPa
75 atm	75,993.75 hPa
100 atm	101,325 hPa
250 atm	253,312.5 hPa
500 atm	506,625 hPa
1,000 atm	1,013,250 hPa

About the units

Standard atmosphere (atm)

Exactly 101,325 Pa — average sea-level air pressure.

Hectopascal (hPa)

One hundred pascals, numerically equal to a millibar. Weather maps show sea-level pressure in hPa (around 1013). One hectopascal equals 100 pascals (Pa).

Frequently asked questions

How many hectopascals are in one standard atmosphere?

There are 1,013.25 hectopascals in one standard atmosphere, and this value is exact by definition.

How do I convert atmospheres to hectopascals?

Multiply the number of atmospheres by 1,013.25. For example, 10 atm × 1,013.25 = 10,132.5 hPa.

How many atmospheres are in one hectopascal?

One hectopascal equals 0.0009869232667 atmospheres. That is the reverse factor, 1 ÷ 1,013.25.

What is 10 atmospheres in hectopascals?

10 atm = 10,132.5 hPa.

Is this atm to hPa converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.