Epoxy Calculator

Epoxy estimation depends on the geometry of your project surface. For rectangular areas, the calculator multiplies length, width, and your desired coating thickness. The core formula is rectangle_volume = length * width * coating. For circular surfaces or cylindrical forms, the calculation utilizes the radius derived from the diameter squared, multiplied by pi and the coating thickness: circle_volume = pi * (diameter / 2)^2 * coating. Always convert all your measurements into the same unit—such as inches or feet—before computing to maintain accurate volume results.

Imagine you are building a custom square coffee table measuring 24 inches by 24 inches, and you want to pour a clear epoxy coating that is 0.25 inches thick. First, convert your dimensions into feet or keep them in inches. Using inches, multiply length (24) by width (24) to get a surface area of 576 square inches. Next, multiply that area by your coating thickness (0.25 inches), yielding a total volume of 144 cubic inches. Since one gallon of liquid contains approximately 231 cubic inches, dividing 144 by 231 tells you that you need roughly 0.62 gallons, or about 80 fluid ounces of mixed two-part epoxy for the pour.

Always mix your two-part epoxy resin and hardener according to the manufacturer's exact weight or volume ratio, as minor deviations can prevent proper curing. Factor in a 5% to 10% safety margin for accidental spills, uneven subfloors, or wood absorption. Finally, pour epoxy in a temperature-controlled environment to avoid trapped air bubbles and surface blushing.