Physics

Air Pressure at Altitude Calculator

Find atmospheric pressure at a given altitude.

Calculated Output

Pressure (kPa) 79.495

Of sea-level pressure (%) 78.456

Formula: P = P₀·(1 − 0.0065h/288.15)^5.255

Step-by-Step Breakdown

1. Values used:

2. Altitude = 2,000

4. Pressure = 79.495kPa

5. Of sea-level pressure = 78.456%

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The math behind it

P = P₀·(1 − 0.0065h/288.15)^5.255, the standard-atmosphere troposphere model.

At 2000 m → about 79.5 kPa (78% of sea level).

Why is breathing harder up high?

Lower pressure means fewer oxygen molecules per breath.