All marine tools
Browse by category or jump straight to the tool you need.
Wind & Weather
Beaufort scale, wind speed converter — knots, mph, km/h, m/s
Navigation & Speed
Knots converter, nautical miles, ETA calculator, hull speed
Electrical
Voltage drop, cable sizer, battery capacity calculator
Fluids & Tanks
Litres/gallons, tank volume (all shapes), fuel consumption
Reference
VHF channels, phonetic alphabet, nav lights, sound signals, Mayday
General Tools
Weight, length, temperature and everyday unit conversions