Fuel Consumption Calculator ⛽
Calculate boat fuel consumption rate (GPH/L/h) and total fuel needed for your trip. Enter engine horsepower, throttle %, and cruise duration.
How to Use the Fuel Consumption Calculator
Enter engine type (inboard/outboard), horsepower, throttle percentage, cruise duration, and fuel type to calculate fuel consumption. Gasoline coefficient is 0.10, diesel is 0.055.
Actual fuel consumption may vary based on sea conditions, hull condition, and load. Use the calculation results as a reference only.
For long-distance voyages, prepare an additional 20-30% fuel reserve beyond the calculated amount.
FAQ
How do I calculate boat fuel consumption?
Fuel consumption (GPH) = HP × throttle% × fuel coefficient. Gasoline coefficient is 0.10, diesel is 0.055. For example, a 200HP gasoline engine at 75% throttle: 200 × 0.75 × 0.10 = 15 GPH. Multiply by trip duration for total fuel needed.
How much fuel does a 150HP outboard use per hour?
At 75% throttle: 150 × 0.75 × 0.10 = 11.25 GPH (gasoline). At full throttle: 150 × 1.0 × 0.10 = 15 GPH. Actual consumption varies with hull efficiency, sea conditions, and load.
What is the difference between inboard and outboard fuel consumption?
Inboard engines are generally more fuel-efficient at cruising speeds due to better hull integration. Outboard motors are more efficient at lower speeds. Both use the same coefficient formula, but actual efficiency depends on hull design and operating conditions.
How much extra fuel should I carry for safety?
Always carry 20-30% more fuel than calculated. The 'rule of thirds' is popular: use 1/3 going out, 1/3 coming back, keep 1/3 in reserve. For offshore trips, carry even more reserve fuel and file a float plan.
Can I contact you for help planning my boating trip?
Yes! For personalized advice on marine trip planning and calculations, reach out to us at card.workshop@gmail.com. We're happy to help.