Pressure at Altitude Calculator
Calculate atmospheric pressure at any altitude.
Supports feet and meters with results in multiple pressure units.
Atmospheric Pressure
Atmospheric pressure decreases with altitude following the barometric formula:
P = P₀ × (1 − (L × h) / T₀) ^ (g × M / (R × L))
Where:
- P₀ = 101,325 Pa (sea level standard pressure)
- L = 0.0065 K/m (temperature lapse rate)
- T₀ = 288.15 K (sea level standard temperature)
- g = 9.80665 m/s² (gravitational acceleration)
- M = 0.0289644 kg/mol (molar mass of air)
- R = 8.31447 J/(mol·K) (gas constant)
Unit conversions:
- Feet to meters:
ft × 0.3048 - Meters to feet:
m × 3.28084
Quick references:
- Sea level: 101,325 Pa = 14.696 psi = 1 atm
- Denver, CO (5,280 ft / 1,609 m): ~83,900 Pa = 12.17 psi
- Mount Everest (29,032 ft / 8,849 m): ~33,700 Pa = 4.89 psi
- Commercial aircraft cabin (8,000 ft / 2,438 m): ~75,300 Pa = 10.92 psi
Valid range: 0 to ~36,000 ft (11,000 m) — the troposphere. Above this, the formula changes.