Boat Bottom Paint Calculator

Paint quantity from hull surface area and paint coverage.

Boat length / LOA (ft)

Beam / width (ft)

Draft (ft)

Number of coats

Paint Type

Professional application (0=DIY, 1=pro)

Tab to move between fields

Total estimated cost

$2,788.35

≈ 21 pairs of sneakers

Wetted surface area (sq ft)332

Paint needed (gallons)1.7

Paint material cost$298.35

Labor cost$1,320.00

Haulout & launch cost$720.00

How to Use This Calculator

Enter Boat length / LOA (ft), Beam / width (ft), and Draft (ft).
Set Number of coats, Paint Type, and Basic vinyl.
Adjust Ablative antifouling, Hard / epoxy antifouling as needed.
Review the Total estimated cost ($) result.
Use Wetted surface area (sq ft) and Paint needed (gallons) to inform your decision.

How the result changes with Boat length / LOA (ft)

Boat length / LOA (ft): Overall length of the boat in feet.
Beam / width (ft): Maximum width of the hull.
Draft (ft): Depth of hull below the waterline.
Number of coats: Coats of bottom paint. Typically 2 for maintenance, 3+ for bare hull.
Paint Type: Type of bottom paint.
Professional application (0=DIY, 1=pro): Whether a boatyard applies the paint (includes labor cost).

Total estimated cost: All-in cost including paint, labor, haulout, and supplies.
Wetted surface area (sq ft): Estimated underwater hull area to be painted.
Paint needed (gallons): Total gallons of bottom paint required for all coats.
Paint material cost: Cost of the antifouling paint alone.
Labor cost: Professional application labor (zero if DIY).
Haulout & launch cost: Cost to haul the boat out and relaunch after painting.

Identify Input Parameters
4 parameters
Boat length / LOA (ft) = 30, Beam / width (ft) = 10, Draft (ft) = 3, Number of coats = 2 = 6 input(s) provided
Calculate Total estimated cost
Total estimated cost = paintCost + suppliesCost + laborRate + hauloutCost
2788.35 = $2,788.35
Calculate Wetted surface area
Wetted surface area = boatLength * (beam + draft) * 0.85
332 = 332
Calculate Paint needed
Paint needed = gallonsPerCoat * numCoats
1.7 = 1.7