How many atmospheres are in one hectopascal?

One hectopascal equals 0.000987 atm. The formula is atm = hPa × 0.000987.

How do I convert hectopascals to atmospheres?

Multiply the value in hectopascals by 0.000987. For example, 100 × 0.000987 = 0.098692 — so 100 hPa = 0.098692 atm.

How many hectopascals are in one atmosphere?

One atmosphere equals 1,013.25 hPa.

Pair · linear · factor 0.000987

hectopascals to atmospheres

hPaatm

Active unit

hectopascals · ≈ 10,000 Pa (base)

All units

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hPahectopascal100

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Frequently asked questions

Pressure

Bar, pascal, PSI — how much air is in your tires

The weather report gives pressure in hectopascals, the gauge on your pump has two scales — bar and PSI — and your car manual talks in bar. It is all one phenomenon wearing different uniforms. Here is how to read pressure without slipping up: why tires soften on their own in the cold, why a "3" on the dial can mean two wildly different things, and how much air really belongs in your wheel.

12 min