Boating & fishing calculators

Enter the water depth, expected tide rise, bow height, planned scope, and rode aboard to get a practical anchoring plan. The result shows required rode, chain and rope to pay out, available scope, maximum usable depth, and a conservative swing circle.

Enter the length, transom width, steering setup, transom height, hull-bottom type, and proposed outboard horsepower. The calculator follows the 33 CFR 183.53 computation method and shows the factor, branch, rounding, and motor check.

Enter a GPS speed, engine RPM, gear ratio, and propeller pitch to calculate measured propeller slip. Then compare another pitch or work backward from a target speed.

Enter the boat length, drive layout, available transom width, and lower-unit clearance to turn the published trim-tab chart into a fit check for one tab on each side.

Enter your measured fuel, burn rate, cruise speed, and the expected current for each direction to find the farther safe turnaround point. The result protects unusable fuel, non-cruise use, and the reserve before splitting trip fuel equally between the outbound and return legs.

Enter the horsepower carried by one shaft, rated rpm, reduction ratio, shaft material strength, safety factor, and candidate diameter. The calculator estimates the torsional shaft diameter and checks whether the entered shaft size has enough capacity.

Enter the circuit current, one-way run length, voltage, drop limit, bundle size, and engine-space condition. The calculator checks both voltage drop and derated ampacity, then recommends the smallest listed conductor that passes both tests.

Enter the hull materials, outboard rating, capacity weights, and foam density to estimate the cured foam volume needed for the USCG level-flotation procedure.