Density Altitude Calculator
Calculate aircraft performance altitude
Density altitude decides whether your runway is long enough today.
The same paved strip that launched you yesterday might refuse you this afternoon. At 3,000 ft pressure altitude and 30°C, your indicated density altitude is closer to 5,500 ft — takeoff run can grow 30-50%, climb rate can halve.
Input Values
Results
Low ImpactPressure Altitude
0
feet
Density Altitude
0
feet
ISA Deviation
0
degrees C
Performance Note
Normal aircraft performance expected
About Density Altitude
About Density Altitude Density Altitude is the altitude at which the aircraft "feels" like it's flying, based on actual air density. Higher density altitude means thinner air and reduced aircraft performance.
Factors that increase density altitude: high temperature, low pressure, high humidity, high elevation.
ISA Deviation ISA Deviation shows how much the actual temperature differs from the International Standard Atmosphere temperature at the given altitude (15C at sea level, decreasing 2C per 1000ft).