Temperature at Altitude (Lapse Rate)

Estimate the air temperature and pressure at a different altitude using the environmental lapse rate, free online.

Temperature at the starting point (°C)

Starting altitude (m)

Target altitude (m)

Lapse rate (°C per 1000 m)

Pressure at the starting point (hPa) — optional (optional)

About this calculator

On average the air cools by 6.5 °C per 1,000 m of altitude (3.57 °F per 1,000 ft) — the standard environmental lapse rate. Dry air cools faster (9.8 °C/km); saturated air slower (about 5 °C/km). Pressure falls roughly 12% per 1,000 m near sea level.