Aircraft Climb Performance & Rate of Climb (ROC) Calculator
Calculate time to climb, ground distance covered, fuel burn, and obstacle climb gradient.
Input Parameters
C172S ~730 FPM, PA28 ~667 FPM, DA40 ~650 FPM, Cirrus SR22 ~1,270 FPM, Baron ~1,700 FPM
Calculation Results
Formula & How Aircraft Climb Performance & Rate of Climb (ROC) Calculator Works
Rate of climb is determined by excess engine power available over power required ($ROC = (P_{avail} - P_{req}) / Weight$). As altitude increases, normally aspirated piston engines lose power at approx 3% per 1,000 ft, causing the climb rate to linearly diminish until reaching the aircraft's absolute ceiling.
- Enter Sea Level Rate of Climb (FPM) (FPM): Input your target parameter value.
- Enter Best Rate of Climb Speed / Vy (KIAS) (KIAS): Input your target parameter value.
- Enter Best Angle of Climb Speed / Vx (KIAS) (KIAS): Input your target parameter value.
- Enter Departure Aerodrome Elevation (ft) (ft): Input your target parameter value.
- Enter Target Cruise Altitude (ft) (ft): Input your target parameter value.
- Enter OAT at Departure (°C) (°C): Input your target parameter value.
- Enter Climb Fuel Consumption (GPH) (GPH): Input your target parameter value.
- Apply Formula: Calculate using
Climb Gradient (%) = (ROC [FPM] / (GS [KTAS] × 101.27)) × 100 | Time = ΔAlt / Average_ROC | Fuel = Time(hrs) × Climb_GPH. - Review Results: View exact computed answers, metrics, and worked mathematical proofs.
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Frequently Asked Questions (FAQs)
What is the difference between Vx and Vy?
Vx (Best Angle of Climb) provides the maximum altitude gain per unit of horizontal ground distance (vital for clearing obstacle trees/hills). Vy (Best Rate of Climb) provides the maximum altitude gain per unit of time (fastest way to cruise altitude).
How do you calculate climb gradient in feet per nautical mile?
Climb Gradient (ft/NM) = (Rate of Climb in FPM × 60) ÷ Groundspeed in Knots. For standard 3.3% IFR obstacle clearance, an aircraft needs at least 200 ft/NM.
Authoritative Standards & Verified Reference Citations
Calculations and mathematical logic on this page are grounded in published statutory rules, regulatory standards, and official government data published by the following bodies:
CASR Part 91 general operating and flight rules, Part 121 fuel reserves, and flight crew licensing standards.
Aviation weather services, standard atmosphere (ISA) profiles, METAR/TAF aerodrome weather reports.
Aeronautical Information Publication (AIP), En Route Supplement Australia (ERSA), and airspace procedures.
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