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Check the runway calculator:
runway.airportdb.io
Top of descent
These calculations are not strictly accurate. It strongly depends on aircraft type and weather. Use it for approximate decision
Start altitude (ft)
End altitude (ft)
Start speed (kts)
End speed (kts)
+/- Wind (kts)
Glideslope (°)
Vertical Speed (fpm)
TOP (nm)
Estimated time (min)
epranka.com