What does 101,325 Pa represent?

That's standard atmospheric pressure at sea level (1 atm), used as the baseline that this formula reduces as altitude increases.

How accurate is this at very high altitudes?

The barometric formula assumes a standard temperature lapse rate and works well up to about 11 km (the troposphere); above that, the actual atmosphere behaves differently and this formula becomes less accurate.

Atmospheric Pressure at Altitude Calculator

Estimate atmospheric pressure at a given altitude using the standard barometric formula, which models how air pressure decreases as elevation increases due to less air mass pressing down from above.

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Formula

P = 101,325 × (1 − 2.25577×10⁻⁵ × h)^5.25588

Learn How This Works

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