Top of Descent Calculator
Estimate top-of-descent distance using the common 3-to-1 rule.
Planning/learning aid only. Always use the aircraft POH/AFM, current charts, weather, NOTAMs and approved operational data for flight decisions.
Enter your values and run the tool.
About this top of descent calculator
Estimate top-of-descent distance using the common 3-to-1 rule.
Results are estimates based on the values you enter.