Required Rate of Climb/Descent Calculator
Work out the vertical rate (ft/min) and gradient (ft/nm) you need to reach a target altitude by a waypoint, given your distance and groundspeed. Compare the ft/nm gradient against published departure climb requirements.
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Departure Procedure Context
Obstacle Departure Procedures (ODPs) and Standard Instrument Departures (SIDs) sometimes specify a minimum climb gradient in feet per nautical mile (e.g., '200 ft/nm to 3,000 ft MSL'). Use the ft/nm output above to verify your aircraft can meet a published climb gradient requirement. Convert between ft/min and ft/nm using your groundspeed: ft/nm = (ft/min ÷ groundspeed in knots) × 60.
Why This Matters to Pilots
Meeting a crossing restriction or a published climb gradient is not optional — it is what keeps you clear of terrain and traffic. Knowing the required rate before you need it lets you decide early whether your aircraft, at today’s weight and density altitude, can comply.
The feasibility check compares only the performance figure you enter. It does not know your actual aircraft capability at current conditions, so always confirm against your performance charts before committing to a climb or descent profile.
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Frequently Asked Questions
This calculator is for educational and planning purposes only. Always refer to your aircraft's POH/AFM, current NOTAMs, and official weather briefings. No calculator is a substitute for pilot-in-command judgment or CFI guidance.
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