Calculate density altitude for flight planning using pressure altitude, outside air temperature, field elevation, and altimeter setting. This free aviation calculator helps pilots estimate how atmospheric conditions affect aircraft performance before takeoff.
Use either method below. If you already know the pressure altitude, use the left calculator. If you only know field elevation and altimeter setting, use the right calculator.
Density altitude is the altitude in the standard atmosphere where the air would have the same density as the current conditions. In practical terms, it tells pilots how the airplane will perform relative to standard conditions.
As density altitude increases, aircraft performance generally decreases. That means longer takeoff rolls, reduced climb rates, and lower engine, propeller, and wing efficiency. This is especially important at high-elevation airports and on hot days.
A high density altitude means the air is less dense than standard. Even an airport at a moderate field elevation can experience very high density altitude on a hot day.
It directly affects aircraft performance. As density altitude rises, takeoff distance increases and climb performance decreases.
Yes. On cold days with high pressure, density altitude can be lower than the actual airport elevation.
This calculator uses a common pilot planning approximation. Always use the approved aircraft performance charts in your POH/AFM for operational decision-making.