Performance Takeoff Calculator

Takeoff ground roll and total distance corrected for density altitude, weight, wind, and gradient.

Field elevation (ft)

Outside air temp (°C)

Altimeter setting (inHg)

Takeoff weight (lb)

POH reference weight (lb)

POH ground roll (ft)

POH total distance (ft)

Headwind (kts, neg=tail)

Runway gradient (%)

Tab to move between fields

Ground roll (ft)

1,606

Total over 50 ft (ft)

2,818

Density altitude (ft)7,400

Pressure altitude (ft)5,000

ISA deviation (°C)20

Soft field roll (ft)1,846

Weight factor0.89

Wind factor1

How to Use This Calculator

Enter field elevation (ft), outside air temperature (°C), and altimeter setting (inHg).
Set actual takeoff weight (lb) and the POH reference weight and ground roll.
Review density altitude, corrected ground roll (ft), and total takeoff distance over 50 ft obstacle.
Verify takeoff distance fits within the available runway, applying appropriate POH correction factors.
Hot, high, or heavy conditions dramatically increase required takeoff distance — plan accordingly.

How the result changes with POH reference weight (lb)

Field elevation (ft): Airport elevation above mean sea level.
Outside air temp (°C): Actual outside air temperature.
Altimeter setting (inHg): Current altimeter setting.
Takeoff weight (lb): Actual takeoff weight.
POH reference weight (lb): Weight used in POH performance chart.
POH ground roll (ft): Ground roll from POH at sea level, std day, calm wind.
POH total distance (ft): Total distance over 50-ft obstacle from POH.
Headwind (kts, neg=tail): Headwind component. Negative for tailwind.
Runway gradient (%): Positive = uphill takeoff; negative = downhill.

Ground roll (ft): Estimated takeoff ground roll.
Total over 50 ft (ft): Total distance to clear a 50-ft obstacle.
Density altitude (ft): Effective altitude for performance calculations.
Pressure altitude (ft): Field elevation corrected for non-standard pressure.
ISA deviation (°C): Difference from standard temperature at this altitude.
Soft field roll (ft): Ground roll with 15% soft/wet runway factor.
Weight factor: Weight correction multiplier (actual/ref)^2.
Wind factor: Wind correction multiplier.

Identify Input Parameters
4 parameters
Field elevation (ft) = 5000, Outside air temp (°C) = 25, Altimeter setting (inHg) = 29.92, Takeoff weight (lb) = 2400 = 9 input(s) provided
Calculate Ground roll
Ground roll = refGroundRollFt * daFactor * weightFactor * windFactor * gradientFactor
1606 = 1606
Calculate Total over 50 ft
Total over 50 ft = refTotalDistFt * daFactor * weightFactor * windFactor
2818 = 2818
Calculate Density altitude
Density altitude = pressureAltitude + 120 * tempDeviation
7400 = 7400
Calculate Pressure altitude
Pressure altitude = fieldElevationFt + (29.92 - altimeterInHg) * 1000
5000 = 5000