Engine & fuel
2 Stroke Oil Mix Calculator
Calculate how much oil to add to your fuel for a 2 stroke mix at 50:1, 40:1, 25:1 or your engine’s specified ratio.
Open toolLESS GUESSWORK. MORE OPEN WATER.
More time on the water.
Less guesswork.
Mix your fuel, plan your running time and understand your propeller. Practical boating tools, ready when you are.
Free to useNo sign-upInstant results
BEFORE YOU GO2T
FUEL1 US gal
+OIL AT 50:12.56 US fl oz
An example. Set your ratio in the tool.
YOUR NEXT TRIP STARTS HERE
One task. The right tool.
Navigation & conversions
Knots to MPH & KM/H Converter
Convert knots to mph and km/h, or reverse the conversion, with instant results in all three speed units.
Open toolPropeller & performance
Prop Slip Calculator
Calculate propeller slip from engine RPM, gear ratio, propeller pitch and GPS speed recorded during your sea trial.
Open toolMAKE YOUR NEXT MOVE
From one answer to the next.
Carry your numbers forward as you plan.
Know your tank. Plan your range.
Measure capacity in inches, feet or centimeters, then estimate your fuel range.
Calculate tank capacity →A distance. A speed. Your time.
Convert your route distance, estimate running time and work out your trip fuel.
Convert your distance →Make it your boat.
Try lettering on a 3D hull, save your favorites and ask your crew to vote.
Open Boat Name Studio →YOUR TOOLBOX, ALWAYS READY
Fuel. Navigation. Performance. A little imagination.
Nine free tools. No account required.
Explore all boating tools →