Boating Calculator

Boating Calculator is a planning aid for anchoring, fuel range, and the speed/time/distance triangle - for a small recreational boat, not a chartplotter or navigation instrument. Use it to check anchor scope, plan fuel for an out-and-back trip, or work the classic speed/distance/time triangle with an ETA, with the formula shown on screen so you can check the math. This is not a substitute for charts, local knowledge, tide/current tables, or seamanship - the skipper is responsible for the vessel. ANCHOR - Enter water depth, bow height above the water, and expected tidal rise - Choose the rode type (all-chain or rope/chain) and the scenario (lunch hook, overnight, or storm) - See the conventional scope ratio for that scenario and rode type - Get the rode length to deploy and the swing radius (rode length plus boat length overall) - Switch between feet and meters FUEL - Enter tank capacity, burn rate, and cruise speed - Choose the classic one-third rule (one-third out, one-third back, one-third reserve) or a configurable reserve percentage - See usable fuel, endurance in hours, and range in nautical miles - See the point-of-no-return distance, including for a return leg burning fuel at a different rate than the outbound leg - Work the speed/time/distance triangle in knots, statute mph, or km/h, with distance following the selected speed unit - Get an ETA from a departure time and a computed travel time BOATS - Save named presets for your own boat's tank capacity, burn rate, and cruise speed - Load a saved boat to fill the Fuel tab instantly BUILT FOR ON-THE-WATER USE - Fast entry with minimal taps - Works offline - No account required - Saved boats and history stay on your device This app is ad-supported. The calculators are available to use; watching a short ad unlocks saving results, calculation history, and saved boat presets. If you want a straightforward anchor scope calculator, boat fuel range calculator, or a speed/time/distance/ETA tool for planning a day on the water, this app gives you the numbers with the formula shown.