Marine Coating Tools & Calculators
Free, practical tools for every hull job — size the wetted area, calculate antifouling, convert wet and dry film thickness, work out coverage, mix the right thinning ratio, and estimate the paint cost before you buy a single tin.
Hull Area Calculator
Estimate the wetted surface area below the waterline from your waterline length, beam, draft, and block coefficient — in square metres and square feet — so you know how much hull you're painting
Antifouling Paint Calculator
Work out how many litres of antifouling your hull needs for a given number of coats, rounded up to whole tins, plus the total cost from hull area, coverage, and price per litre
Wet Film Thickness Calculator
Convert between wet film and dry film thickness using the paint's volume solids, with optional thinning — so you can check the coating with a comb gauge and build the specified dry film
Paint Coverage Calculator
Derive the theoretical and practical spreading rate of a coating in square metres per litre from its volume solids, target dry film thickness, and a loss factor for overspray and waste
Thinning Ratio Calculator
Work out exactly how much thinner to add to marine paint for a given thinning percentage, and the total volume once mixed — in litres or millilitres — without over-thinning the coating
Paint Cost Estimator
Estimate the paint cost of a hull job across a topcoat and an optional primer — litres, whole tins, and total cost from area, coats, coverage, and price per litre