About These Calculators
Calculators for boat owners and marine enthusiasts. Estimate fuel consumption, size propellers, and plan voyages.
Marine & Boating Calculators
16 toolsBoat Fuel Consumption Calculator
Estimate fuel consumption, trip cost, and range for any boat
Propeller Size Calculator
Calculate boat propeller pitch, diameter, slip, and theoretical speed
Boat Loan Calculator
Calculate monthly payments for boat financing
Anchor Rode Calculator
Calculate anchor line scope for safe anchoring
Boat Hull Speed Calculator
Calculate theoretical hull speed from waterline length
Marine Battery Calculator
Size your boat's battery bank for house loads
Boat Bottom Paint Calculator
Calculate antifouling paint needed for your hull
Boat Trailer Weight Calculator
Calculate towing weight and trailer requirements
Nautical Mile Converter
Convert between nautical miles, statute miles, and kilometers
Marine Fuel Consumption Calculator
Calculate boat fuel consumption, range, and cost for any trip
Boat Fuel Burn Rate Calculator
Calculate boat fuel consumption per hour
Marine Battery Bank Calculator
Size your boat's battery bank for electrical needs
Hull Speed Calculator
Calculate theoretical maximum hull speed for displacement boats
Anchor Rode Length Calculator
Calculate how much anchor rode to deploy
Marine Holding Tank Calculator
Size your boat's holding tank for cruising needs
Boat Bottom Paint Coverage Calculator
Boat Bottom Paint Coverage Calculator — calculate antifouling paint needed for your hull
Frequently Asked Questions
Are these marine & boating calculators free?
Yes, all 16 calculators are completely free with no signup required. They run entirely in your browser — no data is sent to any server.
How accurate are these calculators?
Our calculators use industry-standard formulas and are regularly updated. However, they provide estimates — always verify critical calculations with a professional in the relevant field.
Can I use these calculators on my phone?
Yes, all calculators are mobile-responsive and work on any device with a web browser. No app download needed.
Do you save my calculations?
No. All calculations happen in your browser. We don't store any of your inputs or results. Your data stays on your device.
Can I embed these calculators on my website?
Select calculators offer embed codes that you can copy and paste into your website or blog. Look for the "Embed This Calculator" section on individual tool pages.