Marine Paint Coverage Calculator

Estimate bottom paint requirements based on hull dimensions and shape

Total length of the boat from bow to stern at deck level.
ft
Maximum width of the boat at the widest point.
ft
Depth of the hull below the waterline including keel.
ft
Hull shape affects wetted surface area. Full keel boats have more area. Fin keel and powerboats typically have less relative to LOA.
Fresh bottom typically needs 2-3 coats. Annual maintenance usually 1-2 coats. First application on new surface: 3 coats recommended.

Results

Wetted Surface Areasq ft
Paint per Coatgallons
Total Paint Neededgallons
Estimated Cost
Application Timehours
References: Wetted surface area formulas from naval architecture. Coverage rate: ~350-450 sq ft/gallon for ablative paints, ~250-350 for hard paints. Prices based on average marine bottom paint at $180-250/gallon.