Epoxy Calculator

Estimate the epoxy volume to coat a surface at a given thickness.

How the Math Works

The Epoxy Calculator uses the formula volume = area × thickness to determine the amount of epoxy needed for a coating project. This straightforward equation multiplies the surface area you want to coat by the desired thickness of the epoxy layer. To ensure accuracy, both measurements must be in consistent units—such as square feet for area and inches converted to feet for thickness—resulting in volume in cubic feet. For practical use, you can convert cubic feet to gallons by multiplying by 0.75 (1 cubic foot ≈ 0.75 gallons).

Practical Applications

To apply this calculation, first measure the total surface area to be coated, such as a garage floor or tabletop. Next, decide on the desired epoxy thickness—typically 1/8 inch (0.0104 feet) for a thin sealant or 1/4 inch (0.0208 feet) for a glossy finish. Convert thickness to feet, then multiply by the area. For example, a 500 sq ft floor with 0.1 ft thickness requires 50 cubic feet (or ~37.5 gallons) of epoxy. Always round up to account for spillage or uneven surfaces.

Day-to-Day Use

This calculation helps avoid costly mistakes in DIY projects by ensuring you purchase the exact amount of epoxy needed. Whether coating a kitchen countertop, sealing a concrete patio, or finishing a wood project, knowing the required volume prevents mid-project shortages or excess waste. It also aids in budgeting, planning delivery schedules, and choosing the right container size (e.g., 1-gallon vs. 5-gallon kits). By optimizing material use, you save time, money, and reduce environmental impact from leftover products.

Worked example

50 ft² at 2 mm → ~1.0 gal.

FAQ