Top of Descent Calculator
Calculate when to begin your descent with precision accuracy using exact trigonometry.
TOP OF DESCENT
TOD CALCULATOR
ACTIVE
FT
FT
DEG
KT
NM
Primary Results
Distance from TOD
113.63
NAUTICAL MILES
Required VS
1,486
FEET PER MINUTE
Time to Descent
22.21
MINUTES
Descent Parameters
Alt Change
33,000
FT
Drop per NM
318.44
FT/NM
INFO: At 3° glide angle, rule-of-thumb is VS ≈ GS × 5. This calculator uses exact trigonometry for precision.
Professional Tips
- •Plan your descent 3-5 minutes early to account for ATC instructions
- •Use a 3-degree glide slope as standard for smooth passenger comfort
- •Factor in headwinds/tailwinds by adjusting your ground speed input
- •Start your descent slightly high to have energy management options