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First release. Work out anchor scope for a depth and rode, or fuel for an out-and-back run with a reserve. A third screen solves any leg of the speed, distance, and time triangle and gives an ETA. Each screen shows the formula it used.
Anchor scope, fuel range and passage time for small craft.
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.