Aircraft Climb Performance & Rate of Climb (ROC) Calculator
Calculate time to climb, ground distance covered, fuel burn, and obstacle climb gradient.
Last reviewed by the myCalculator Editorial Team
Input Parameters
C172S ~730 FPM, PA28 ~667 FPM, DA40 ~650 FPM, Cirrus SR22 ~1,270 FPM, Baron ~1,700 FPM
Calculation Results
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Formula & How Aircraft Climb Performance & Rate of Climb (ROC) Calculator Works
Climb gradient shows how much height you gain per distance: gradient (%) = rate of climb (ft/min) ÷ (ground speed (kt) × 101.27) × 100. An aircraft climbing at 730 ft/min at a ground speed of 74 knots has a gradient of 730 ÷ (74 × 101.27) = about 9.7%, or roughly 590 ft per nautical mile. Time to climb is the height difference divided by the average climb rate, and climb fuel is the time multiplied by the climb fuel flow. Rate of climb falls with altitude and rises when the temperature is lower, so a hot day at a high aerodrome gives much less climb performance. Use the aircraft's flight manual for planning, and check obstacle clearance on departure.
- 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.
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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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Operational Scenario
Operational Scenario: Headwind Stronger Than Forecast on a Marginal-Range Leg
You planned Bathurst (YBTH) to Coonabarabran (YCBB) then Moree (YMOR), about 2 h 50 min in total, in a Cessna 182 by day VFR, carrying trip fuel plus the 30-minute final reserve. Levelling at cruise you find a 25 kt headwind rather than the forecast 10 kt. At the first fuel check overhead Coonabarabran, fuel remaining is 15 minutes below plan and the gap is widening each leg.
Practical Decisions
- •Plan to land with the final reserve untouched (CASR Part 91 MOS chapter 19): 30 minutes for a piston or turboprop aeroplane of 5,700 kg or less by day VFR; 45 minutes by night VFR or IFR; 20 minutes for a helicopter by VFR.
- •Recalculate at the groundspeed you are actually achieving: fuel to destination at the observed headwind, compared with fuel remaining minus the final reserve.
- •Nominate an en-route aerodrome for a fuel diversion and set the trigger before you need it — "if fuel remaining reaches X litres at this point, divert".
- •Log a fuel check at every waypoint: time, fuel remaining, fuel used against plan, and revised endurance. A written trend makes the divert decision obvious.
Knowledge Check
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