Estimate boat fuel use, gallons per hour, fuel needed, trip cost, safe range, and reserve fuel for outboards, inboards, pontoons, fishing boats, cruisers, and coastal trips. This calculator uses horsepower, engine type, throttle level, trip distance, cruising speed, fuel tank size, reserve percentage, fuel price, load, sea state, and current.
Fuel burn:
The calculator estimates fuel burn from horsepower, engine type, throttle setting, load, sea state, and current. You can also enter a manual gallons-per-hour value if you already know your boat’s fuel burn.
Trip fuel:
Trip distance and average speed are used to estimate travel time. Fuel needed is then calculated from the adjusted burn rate.
Range and reserve:
The calculator subtracts reserve fuel from tank capacity to estimate usable fuel, safe range, and whether the trip appears within your fuel plan.
A boat fuel calculator helps plan fuel stops, fishing runs, coastal trips, lake crossings, pontoon outings, and emergency margins before leaving the dock.
Actual fuel use depends on hull design, engine tuning, propeller, trim angle, RPM, load, sea conditions, current, wind, bottom growth, and operator habits.
This calculator uses a practical fuel-planning estimate:
Fuel Needed = Fuel Burn Rate × Trip Time
Estimate fuel burn per hour, then multiply by trip time. Trip time is distance divided by average speed. Add reserve fuel for safety.
It depends on horsepower, engine type, RPM, hull, load, and conditions. Higher throttle settings and rough water can greatly increase fuel burn.
Many boaters use the one-third rule: one-third of fuel for the trip out, one-third for the return, and one-third held as reserve.
Yes. Diesel engines often burn less fuel per horsepower-hour than gasoline engines, but actual use depends on the boat and engine setup.