Take-Off Distance Available (TODA)
Calculate the Take-Off Distance Available, TODA = TORA + clearway, from the Take-Off Run Available (TORA) and the clearway length. TODA is one of the four declared distances of a runway, central ICAO operational concepts. The clearway is an obstacle-free rectangular area beyond the runway over which the aircraft can complete the initial climb to a minimum height — it extends takeoff distance without extra pavement, since the aircraft is already airborne. The declared distances (TORA, TODA, ASDA, LDA) are published for each runway threshold and used by pilots and dispatchers to verify, for each takeoff, that the aircraft — with its weight, configuration and the day's conditions — fits the available runway with required margins. Enter the TORA and the clearway length.
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Distância de decolagem disponível (TODA)
A TODA (Take-Off Distance Available — distância de decolagem disponível) é TODA = TORA + clearway, uma das quatro distâncias declaradas de uma pista, conceitos centrais da operação aeroportuária definidos pela ICAO. A TORA (Take-Off Run Available) é o comprimento de pista pavimentada disponível para a corrida de decolagem; a clearway (zona livre de obstáculos) é uma área retangular ao final da pista, livre de obstáculos, sobre a qual a aeronave pode completar a fase inicial de subida até atingir uma altura mínima de segurança. Como o avião já estará no ar sobre a clearway, ela estende a distância disponível para decolar sem exigir pavimento adicional — uma forma econômica de aumentar a capacidade de decolagem onde há espaço livre além da pista. As quatro distâncias declaradas (TORA, TODA, ASDA e LDA) são publicadas para cada cabeceira nas cartas e publicações aeronáuticas (AIP), e usadas por pilotos e despachantes operacionais para verificar, antes de cada decolagem, se a aeronave — considerando seu peso, a configuração de flapes, o vento e as condições do dia — cabe na pista com as margens de segurança regulamentares. Subdimensionar é impensável: a verificação das distâncias declaradas é um item obrigatório do despacho de voo. Informe a TORA e o comprimento da clearway.
Related Tools
Accelerate-Stop Distance Available (ASDA)
Calculate the Accelerate-Stop Distance Available, ASDA = TORA + stopway, from the Take-Off Run Available (TORA) and the stopway length. ASDA is one of the four declared distances and has a critical safety role: it is the distance available to accelerate to the decision speed (V₁) and, if the pilot aborts the takeoff (engine failure or other), still stop safely. The stopway is a paved (or adequately strong) area beyond the runway, able to bear the aircraft in an emergency stop, not used in normal operation. Unlike the clearway (for the airborne aircraft), the stopway is for the aircraft on the ground, braking. ASDA is decisive in the balanced field length concept: the point where the distance to continue takeoff (one engine out) equals the distance to abort and stop defines V₁ and the required runway length. Enter the TORA and the stopway length.
Takeoff Runway Distance Calculator
Estimates single engine aircraft takeoff distance from weight, pressure altitude and temperature using typical aircraft manual corrections.
Corrected Runway Length (ARFL)
Calculate the corrected runway length from the aircraft reference field length (ARFL) and the three ICAO correction factors: L = L₀·(1 + 0.07·E/300)·(1 + 0.01·ΔT)·(1 + 0.10·S). The basic length L₀ (m) is required at sea level, ISA atmosphere and level runway; corrections increase it for: aerodrome elevation E (+7% per 300 m, as thin air reduces lift and thrust), temperature ΔT above ISA (+1% per °C, same density reason) and effective runway slope S (+10% per 1% slope, which hinders takeoff acceleration). This is fundamental in airport planning: it decides whether a runway can serve a given aircraft at a given airport. High-altitude, hot-climate airports need far longer runways — the same aircraft needs much more runway in La Paz or Brasília than at sea level. Enter the basic length, elevation, temperature difference and slope.
The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.