Work out landing distance required instantly with clear inputs, formula shown and shareable results.
Landing distance is corrected for pressure altitude (about +5% per 1,000 ft), runway surface and condition, and the wind component. The factored figure applies the 1.43 (43%) safety factor used for public transport landing distance assessment, giving the runway length you actually want available.
Landing distance
LDR = chart distance x (1 + 0.05 x PA/1000) x surface factor x wind factor; factored = LDR x 1.43
Aviation results are planning estimates only. Always verify take-off, landing, fuel, weight and balance figures against the certified Aircraft Flight Manual, current performance charts and applicable aviation regulations before flight.
Regulators require a margin between the demonstrated landing distance and the runway used in practice. A 43% additive margin (factor 1.43) is the widely used figure for turbine aeroplane landing distance available checks.
No. 15% is a typical planning increment; contaminated runways with standing water, slush or ice can easily add 60% or more and demand manufacturer data.