How to use the TOD Calculator in MSFS
Distance (NM) = (Altitude to lose / 1000) × 3 · Descent Rate (FPM) = Ground Speed × 5.
Plan your descent perfectly. Enter your current altitude, target altitude, and ground speed to get your descent distance and target vertical speed (FPM).
Distance (NM) = (Altitude to lose / 1000) × 3 · Descent Rate (FPM) = Ground Speed × 5.