Landing Distance Calculator

Like takeoff performance, POH landing distance charts assume sea level, standard temperature, max gross weight, and no wind, so this calculator applies correction factors for actual conditions on top of your base ground roll. Altitude and above-ISA temperature each add about 5% per 1,000 ft and per 10°C respectively (half the penalty used for takeoff, since landing performance is less altitude-sensitive than climb performance), and weight is corrected as the square of the ratio to the POH's reference weight. Headwind and tailwind use the same asymmetric model as the takeoff calculator — 10% shorter per 9 kt of headwind, 10% longer per 2 kt of tailwind — while runway slope works in the opposite direction from takeoff: uphill landings are shorter (better braking help from gravity) and downhill landings are longer.

Runway condition is the biggest lever here: wet pavement adds about 30% to the corrected ground roll and contaminated (snow or ice) surfaces add about 60%, reflecting reduced braking friction. The corrected ground roll is multiplied by 1.67 to estimate total distance from 50 ft AGL through flare and rollout, and if you select a Part 121 or 135 operation type, a regulatory safety factor (1.43 for a dry runway, 1.67 for wet) is layered on top — these are the certificated safety margins used in commercial dispatch planning. Private/Part 91 flights get no such regulatory pad, so always add your own margin against available runway length.