Flight Fuel Cost Calculator
Calculate the total fuel cost of a flight, including regulatory reserves, from distance, airspeed, burn rate, and fuel price. Perfect for pilots, dispatchers, and operators estimating trip expenses before departure.
About this calculator
Fuel cost is determined by how long you fly, how much fuel the engine burns per hour, what reserve buffer regulations require, and the current price of aviation fuel. The formula is: Fuel Cost = ((distance / airspeed) × fuelBurn × (1 + reserveType)) × fuelPrice. Distance divided by airspeed gives flight time in hours. Multiplying by fuelBurn (gal/hr) gives total gallons consumed en route. The reserve factor (expressed as a decimal — e.g. 0.10 for a 10% reserve) inflates the fuel load to satisfy FAA or ICAO reserve requirements. Multiplying by fuelPrice converts gallons into dollars. This approach ensures your budget covers not just the trip fuel but also the mandatory safety buffer.
How to use
Flight details: 450 nm trip, 150-knot airspeed, 12 gal/hr burn, $6.50/gal fuel price, 10% reserve (0.10). Step 1 — Flight time: 450 / 150 = 3.0 hours. Step 2 — Trip fuel: 3.0 × 12 = 36 gallons. Step 3 — With reserve: 36 × (1 + 0.10) = 39.6 gallons. Step 4 — Total cost: 39.6 × $6.50 = $257.40. Enter your actual figures to instantly see how fuel price changes or a different reserve requirement affect your total fuel bill.
Frequently asked questions
How does the fuel reserve requirement affect total flight fuel cost?
Reserve fuel is added on top of trip fuel and is not available for en-route use, but you still pay for it at the pump. A 10% reserve on a 40-gallon trip adds 4 gallons; at $7/gal that is $28 extra. On longer flights or with higher reserves (IFR alternates can push reserves to 20–25%), the cost difference becomes meaningful. Understanding this helps operators accurately quote trip costs rather than under-budgeting by ignoring the reserve portion of the fuel uplift.
What is a typical fuel burn rate for different types of general aviation aircraft?
Fuel burn varies enormously by aircraft type. Single-engine piston aircraft like a Cessna 172 burn 8–10 gal/hr; high-performance singles such as a Cirrus SR22 burn 14–17 gal/hr. Piston twins average 20–30 gal/hr, turboprops range from 40 to 100 gal/hr, and light jets burn 100–200 gal/hr. Always use the specific figures from your aircraft's POH at the planned cruise altitude and power setting, as actual burn can deviate significantly from book numbers in real conditions.
Why does airspeed matter when calculating total fuel cost for a fixed distance?
Airspeed determines how long the engines run to cover the route, and engine run time directly drives fuel consumption. Flying 300 nm at 100 knots takes 3 hours; flying the same distance at 150 knots takes only 2 hours. If burn rate is constant, the faster airspeed saves one hour of fuel. However, higher airspeeds often require higher power settings that increase the gal/hr burn rate, so the savings may be partially offset. Finding the best-range cruise speed — the sweet spot between airspeed and efficiency — minimises cost per nautical mile.