Landing Performance Calculator

• Base distance from the POH table (PA × temperature)
• Wind: −1.5% per kt headwind, +5% per kt tailwind
• Slope +5%/1% down; dry grass +15%

C172 at 2400 lb, field 2000 ft, QNH 1013, 20 °C, 10 kt headwind, level paved runway.

1. 1.Look up landing ground roll + 50 ft distance for PA 2000 ft × 20 °C.
2. 2.Scale for landing weight, then apply the headwind reduction.
3. 3.Check the required distance against the runway available.

Landing distance within limits with a healthy safety margin.

Landing distance grows with density altitude, weight, tailwind, downslope and contaminated surfaces. The tool reads landing ground roll and the distance from 50 ft from the aircraft's table for the pressure altitude and temperature, scales for landing weight, applies the wind, slope and surface corrections, then checks the required distance against the landing distance available.

Landing is the mirror of takeoff, but note a DOWNslope lengthens the landing roll (a downhill runway is harder to stop on). Apply the regulatory landing factor (e.g. 1.43× for turbine ops) and always compare to the LDA, not the full runway length.