Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Trip fuel cost
$249.38
Gallons per hour
8.8
Total gallons
52.5
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter engine horsepower.
- 2Enter average throttle load (%).
- 3Enter hours running.
- 4Enter fuel price ($/gal).
- 5Read your trip fuel cost on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Engine horsepower and cruise hours drive fuel burn. This estimates gallons per hour, trip gallons, and total fuel cost so you can budget a day on the water.
Worked example
Using the values the calculator loads with:
Inputs
- Engine horsepower: 250
- Average throttle load: 70 %
- Hours running: 6
- Fuel price: 4.75 $/gal
Results
- Trip fuel cost: $249.38
- Gallons per hour: 8.8
- Total gallons: 52.5
What each field means
Inputs
- Engine horsepower
- The engine horsepower used in the calculation. Starts at 250 so you have a working example on load.
- Average throttle load (%)
- The average throttle load used in the calculation, measured in %. Starts at 70 % so you have a working example on load. Accepted range: 10–100 %.
- Hours running
- The hours running used in the calculation. Starts at 6 so you have a working example on load.
- Fuel price ($/gal)
- The fuel price used in the calculation, measured in $/gal. Starts at 4.75 $/gal so you have a working example on load.
Results
- Trip fuel cost
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Gallons per hour
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total gallons
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the boat fuel consumption calculator work?
Engine horsepower and cruise hours drive fuel burn. This estimates gallons per hour, trip gallons, and total fuel cost so you can budget a day on the water. The underlying maths is: GPH ≈ HP × 0.05 × load%. Trip gallons = GPH × hours.
What do I need to enter?
4 values: engine horsepower, average throttle load, hours running, and fuel price. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the trip fuel cost result mean?
It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary.
Who is this tool for?
It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Boat Fuel Consumption Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/boat-fuel-consumption
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/boat-fuel-consumption" target="_blank" rel="noopener">Boat Fuel Consumption Calculator — RevenueLab</a> (2026).</p>
Source: [Boat Fuel Consumption Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/boat-fuel-consumption) (2026).