Aircraft Range Calculator
Estimate an aircraft's maximum range based on usable fuel, consumption rate, payload, and cruise speed. Useful for flight planning when evaluating whether a stop is needed or comparing aircraft performance.
About this calculator
Aircraft range depends on how much usable fuel is available, how efficiently the engine burns it, and how fast the aircraft travels. The formula used here is: Range = ((fuelCapacity × (1 − reserveFuel)) / (baseFuelConsumption × (1 + payloadWeight / 10,000))) × cruiseSpeed. The reserve fuel factor (expressed as a decimal, e.g. 0.10 for 10%) reduces usable fuel to comply with regulations. The payload penalty term (payloadWeight / 10,000) approximates the increased fuel burn caused by additional weight — heavier aircraft must generate more lift, increasing drag and fuel flow. Multiplying endurance by cruise speed converts flight time into a distance in nautical miles.
How to use
Aircraft specs: 400-gallon capacity, 45 gal/hr base consumption, 280-knot cruise, 6,000 lb payload, 10% reserve (0.10). Step 1 — Usable fuel: 400 × (1 − 0.10) = 360 gallons. Step 2 — Adjusted burn rate: 45 × (1 + 6,000 / 10,000) = 45 × 1.6 = 72 gal/hr. Step 3 — Endurance: 360 / 72 = 5 hours. Step 4 — Range: 5 × 280 = 1,400 nautical miles. Enter your aircraft's actual figures to get a customized range estimate.
Frequently asked questions
How does payload weight affect aircraft range and fuel consumption?
Additional payload increases the aircraft's gross weight, which requires greater lift and therefore produces more induced drag. More drag means the engines must work harder, raising fuel consumption above the unloaded baseline. In this calculator the effect is approximated as a linear penalty: every 10,000 lbs of payload doubles the effective fuel burn rate. In reality the relationship is non-linear and varies by aircraft type, altitude, and airspeed, so this estimate is best used for planning purposes rather than precise performance charts.
What fuel reserve percentage should I use when calculating aircraft range?
FAA regulations for VFR day flight require enough fuel to fly to the destination plus 30 minutes at cruise speed; night VFR requires 45 minutes. IFR flights require fuel to the destination, an alternate airport, and 45 minutes beyond. These translate roughly to 10–15% reserve for shorter flights and up to 20% for longer IFR trips. Airlines and business aviation operators often add additional company-policy reserves on top of regulatory minimums, particularly on oceanic or remote routes where diversions are costly.
Why does cruise speed matter when calculating maximum flight range?
Cruise speed converts endurance (hours of fuel) into range (distance). Two aircraft with identical fuel loads and burn rates will have very different ranges if one cruises at 180 knots and the other at 450 knots. However, higher cruise speeds usually come with higher fuel burn, so there is an optimal speed — often called the 'maximum range cruise' speed — where the ratio of speed to fuel flow is greatest. Pilots flying for maximum range should consult their POH's range-performance tables rather than relying solely on maximum cruise speed figures.