Epoxy Resin Coverage Calculator
Coating a surface with epoxy is a volume problem: the resin needed equals the surface area times the coat thickness. Pick a rectangular or round surface, enter its dimensions, the coat thickness and a waste allowance, and this tool returns the resin volume in cubic inches, US fluid ounces and millilitres.
Epoxy coverage formula
Rectangular area = length * width
Round area = pi * (diameter / 2) ^ 2
Resin (cu in) = area * thickness * (1 + waste / 100)
US fl oz = cu in / 1.804688; ml = cu in * 16.387064
The conversions use exact factors: one US fluid ounce is 1.804688 cubic inches and one cubic inch is 16.387064 millilitres.
Worked example
A 36 by 24 inch tabletop has an area of 864 square inches. At 0.125 inch thickness that is 108 cubic inches, and with a 10 percent waste allowance, 118.80 cubic inches. That is 118.80 / 1.804688 = 65.83 US fluid ounces, or about 1,946.79 millilitres.
Epoxy coverage: frequently asked questions
How much epoxy do I need to coat a surface?
Epoxy volume equals the surface area times the coat thickness. Work in consistent units: area in square inches times thickness in inches gives cubic inches, which you can convert to fluid ounces or millilitres. Add a waste allowance for spread, drips and mixing losses.
What coat thickness should I use?
A typical flood coat for art or tabletops is often around 1/8 inch (about 3 mm), while seal coats are much thinner. Follow your product's recommended pour depth per layer; pouring too thick can trap heat and cure poorly. The thickness here is editable.
How do I convert cubic inches to fluid ounces?
One US fluid ounce is 1.804688 cubic inches, so divide cubic inches by 1.804688 for US fluid ounces. One cubic inch is also 16.387064 millilitres. This calculator reports cubic inches, US fluid ounces and millilitres.
Does the calculator handle round surfaces?
Yes. Choose rectangular and enter length and width, or choose round and enter the diameter. Area for a circle is pi times radius squared, where radius is half the diameter.
Sources and notes
- The calculation is geometry: volume equals area times thickness. The volume-unit factors (1 US fl oz = 1.804688 cu in; 1 cu in = 16.387064 ml) are exact.
- Recommended pour depth and coverage come from your epoxy product's data sheet; this tool assumes no fixed product.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.