How do I calculate declared distances (TORA, TODA, ASDA, LDA)?

Enter runway length, displaced thresholds, stopway, and clearway per runway end, and AvPlot computes all four declared distances. TORA is takeoff run available, TODA adds clearway, ASDA adds stopway, and LDA is landing distance available after any displaced threshold. The method follows FAA AC 150/5300-13B Appendix H.

What is the difference between TORA and ASDA?

TORA (Takeoff Run Available) is the runway length declared available for the takeoff ground run. ASDA (Accelerate-Stop Distance Available) is TORA plus any stopway, the distance available to abort a takeoff and stop.

LDA is Landing Distance Available, the runway length declared available for landing, measured from the threshold or displaced threshold to the runway end.

Declared Distance Calculator

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Compute TORA, TODA, ASDA, and LDA per AC 150/5300-13B Appendix H. How to use this tool →

Declared Distance Calculator

TORA · TODA · ASDA · LDA per runway end

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Airport (Optional)

FAA LID / ICAO (prefills published declared distances)

Optional — bare 3-letter codes auto-prefix K (DEN → KDEN).

Declared Distances Summary

Per AC 150/5300-13B · All values in feet

Runway	TORA	TODA	ASDA	LDA

RSA / ROFA / ROFZ Reference →

Basis: AC 150/5300-13B Chg 1 (8/16/2024), Appendix H · clearway capped at 0.5×runway length (¶3.14.1) · approach/departure obstacle slopes per AC 13B. Published declared distances, when prefilled, carry their FAA NASR cycle date.

Declared distances shown are calculated values based on user inputs. Obstacle analysis uses simplified FAA surface geometry per AC 150/5300-13B. All declared distances must be verified by a licensed airport engineer and coordinated with the FAA Airports District Office before use in official Airport Layout Plans, Airport Master Records, or regulatory submittals.