Work out runway length requirement instantly with clear inputs, formula shown and shareable results.
The runway you need is the longer of the take-off and landing requirements, adjusted for slope (about +5% of take-off distance per 1% of upslope) and then increased by a planning margin. Reporting which case governs tells you whether take-off performance or braking performance is the limiting factor for the runway.
Runway length
Required = max(TODR x (1 + 0.05 x upslope%), LDR) x (1 + margin%)
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.
On take-off the aircraft must accelerate against gravity for the whole roll, so a 1% upslope typically adds around 5% to the distance. On landing an upslope actually helps deceleration.
A single planning margin is fine for a first pass, but certified operations apply separate factors to take-off and landing distances.