Aircraft Fuel Burn Calculator
Reviewed by Hamza Gujjar, Algorithm Architect & Software Developer
Last updated: August 19, 2026Fuel Burn: The Number Every Flight Budget Starts With
Fuel is typically the single largest variable cost in operating an aircraft, and it scales directly with two things: how fast the engines consume it, and how long they run. This calculator turns those two inputs into a trip fuel figure two different ways — from flight time directly, or from distance and ground speed when time hasn't been worked out yet — so it fits naturally into planning at whichever stage you're at.
The Formulas
There are two calculation paths, selected by which inputs are available:
Fuel Used = Fuel Flow Rate × Flight Time
Distance-based:
Flight Time = Distance ÷ Ground Speed
Fuel Used = Fuel Flow Rate × Flight Time
Both converge on the same underlying relationship — fuel flow rate (gallons per hour) multiplied by time airborne (hours). The distance-based path simply derives that time first from distance over ground speed.
Where This Calculation Matters
- Trip cost estimation — multiply the result by current fuel price per gallon to get a realistic per-flight fuel cost before committing to a trip.
- Payload trade-offs — on weight-limited aircraft, knowing fuel burn in advance helps decide how much can be carried in passengers or cargo versus fuel.
- Range verification — comparing calculated fuel burn against usable fuel capacity is a quick sanity check on whether a route is flyable without a stop.
- Comparing aircraft — running the same route through different fuel flow rates makes it straightforward to compare operating cost between airframe options.
Typical Fuel Flow by Aircraft Class
Fuel flow varies enormously by airframe and power setting. The figures below are representative cruise fuel flows, useful as sanity-check ranges rather than performance-chart replacements:
| Aircraft Class | Typical Fuel Flow |
|---|---|
| Single-engine piston (e.g. C172-class) | 8–10 gal/hr |
| High-performance single (e.g. SR22-class) | 15–18 gal/hr |
| Light twin piston | 24–30 gal/hr |
| Turboprop (single-engine) | 50–70 gal/hr |
| Light business jet | 150–190 gal/hr |
| Mid-size business jet | 230–280 gal/hr |
Always use the fuel flow figures from the aircraft's own performance charts or fuel totalizer for actual flight planning — the table above is for general reference only.
How to Use This Calculator
- Choose whether you're calculating from flight time or from distance and ground speed.
- Enter the fuel flow rate in gallons per hour, taken from the aircraft's performance data at your planned power setting.
- Depending on the mode selected, enter either the flight time directly, or the distance in nautical miles plus expected ground speed in knots.
- Select Calculate for the total fuel required, along with the full working shown step by step.
Related Calculations
Pair this result with the Fuel Reserve Calculator to add regulatory reserve fuel on top of trip fuel, or start from the Flight Distance Calculator if you don't yet have a distance figure for the route.
Principles of Aeronautical Navigation and Aircraft Fuel Planning
An aircraft fuel burn calculator computes total mission fuel requirements, flight leg consumption rates, taxi fuel, climb/descent allocations, and mandatory statutory regulatory reserves for commercial airliners and general aviation aircraft. In flight operations engineering, fuel calculations balance aircraft payload capacity against structural maximum takeoff weight (MTOW) limits.
The Fundamental Mission Fuel Planning Breakdown
Specific Fuel Consumption and the Breguet Jet Range Equation
In turbine jet propulsion, fuel burn efficiency is governed by Thrust Specific Fuel Consumption (TSFC, in lbs fuel / lbf thrust / hour). The cruise fuel consumption over distance is modeled via the Breguet Range Equation:
Where V is true airspeed, L/D is aircraft aerodynamic lift-to-drag ratio (typically 16:1 to 19:1 for modern commercial airliners), and W terms represent initial and final aircraft weights.
FAA Mandatory Regulatory Fuel Reserve Guidelines
- FAA VFR Day/Night Reserve: Fly to destination plus 30 minutes (Day) or 45 minutes (Night) at normal cruising fuel consumption.
- FAA IFR Commercial Transport Reserve: Fly to destination, execute missed approach, fly to most distant nominated alternate airport, plus 45 minutes of holding fuel at normal cruising speed.
Step-by-Step Worked Calculation Example
Example: Flight Fuel Plan for a Light Twin Turboprop Flight
Problem: A twin-engine turboprop plans a 600-nautical-mile (NM) flight at a true airspeed of 250 knots (Cruise Time = 600 / 250 = 2.40 hours). Performance data: (1) Taxi fuel = 80 lbs; (2) Climb fuel = 150 lbs (takes 15 min, covers 45 NM); (3) Remaining cruise (555 NM @ 2.22 hrs) burns 600 lbs/hour; (4) Descent fuel = 100 lbs (takes 15 min); (5) Alternate airport is 80 NM away (requires 220 lbs); (6) 45-minute IFR holding reserve burns 450 lbs. Calculate total required Ramp Fuel in pounds and gallons (Jet-A density = 6.70 lbs/gallon).
Step 1: Calculate Trip Fuel (Climb + Cruise + Descent):
Cruise Fuel = 2.22 hours × 600 lbs/hr = 1,332.0 lbs
Trip Fuel = 150 (Climb) + 1,332 (Cruise) + 100 (Descent) = 1,582.0 lbs
Step 2: Add Taxi, Alternate, and 45-Minute Reserve:
Total Ramp Fuel = 80 (Taxi) + 1,582 (Trip) + 220 (Alternate) + 450 (Reserve) = 2,332.0 lbs
Step 3: Convert Pounds to Jet-A Gallons (Density = 6.70 lbs/gal):
Volume = 2,332.0 lbs / 6.70 lbs/gal = 348.06 Gallons
Conclusion: The aircraft requires a minimum dispatch fuel load of 2,332 lbs (348 gallons) of Jet-A fuel.
Cost of Fuel Tankering
Carrying excess "tankered" fuel to avoid buying expensive fuel at destination airports increases aircraft weight, requiring approximately 3% to 5% extra fuel burn per flight hour just to carry the additional fuel mass.
Step Climbs in Long-Haul Flight Planning
During long-haul international flights (such as a 12-hour transpacific route), an airliner burns off tens of thousands of pounds of fuel, significantly lightening total aircraft weight. Flight Management Systems (FMS) compute optimal Step Climbs (e.g., cruising initially at Flight Level FL330, then climbing to FL370 and FL410 as weight decreases), operating the jet engines in thinner air where lower aerodynamic drag maximizes specific range nautical miles per pound of fuel.
FMS Cost Index (CI) Optimization
Airline dispatchers program the Flight Management Computer with a Cost Index (CI = Hourly Time Cost / Fuel Price per lb), balancing crew flight overtime costs against aerodynamic fuel economy speed profiles.
Extended-Range Twin-Engine Operations (ETOPS) Fuel Planning
Transoceanic commercial flights operating under ETOPS regulations calculate critical Critical Fuel Reserves to guarantee diversion capability to an adequate enroute alternate airport on single-engine cruise thrust following cabin depressurization.
Auxiliary Power Unit (APU) Ground Fuel Consumption
On airport taxiways, airliners operate the tail-mounted Auxiliary Power Unit (APU) to supply cabin air conditioning and electrical power, burning 150 to 300 lbs/hr of fuel.