The quick answer is – a single gallon of epoxy covers approximately 13 square feet at a pour thickness of ⅛ inch.
This estimate includes up to 2 percent “extra” epoxy than is necessary to cover the suggested area because there tends to be a bit of runoff over surface edges.
Another way to look at it is that a gallon of epoxy converts to roughly 230 cubic inches of volume.
Read on to learn more about how much epoxy you should use…
How Can I Estimate How Much Epoxy I Need?
The quickest, easiest, and most common way to estimate how much epoxy you need for a job is by multiplying the length, width, and depth of the surface to be poured into/covered.
If you’re building something like a river table with various width measurements, measure each one individually and then figure out the average overall width (and use it to multiply with the length and depth).
Keep in mind that some epoxy products may come with different instructions for estimating how much to use, in these cases be sure to always follow the manufacturer’s official instructions rather than the easy estimating method.
How Much Do 2 Gallons of Epoxy Cover?
Two gallons of standard epoxy covers an area of roughly 26 square feet and ⅛ inch deep.
For most small to medium-sized epoxy products, 2 gallons of epoxy is an adequate amount (in fact, a single gallon may be more than enough).
If you plan on making a river table, 2 gallons of epoxy won’t be enough for the river unless it is a short and thin one.
How Much Do 5 Gallons of Epoxy Cover?
Five gallons of epoxy is enough for medium to large epoxy projects. This many gallons of epoxy covers an estimated area of up to 65 square feet with a ⅛ inch depth.
That said, unless you are doing multiple epoxy projects, like building river tables or doing epoxies, or using epoxy to seal and finish floors or countertops, five gallons is probably far more than you need for your small epoxy projects.
For building river tables, at least 5 or 10 gallons are needed. The largest river tables take upwards of 15 to 20 gallons of epoxy.
Do Deep Pour and Table Top Epoxy Cover the Same Square Feet?
Generally speaking, there is typically little to no difference in square feet per gallon coverage between deep pour epoxy or table top epoxy.
A gallon of deep pour should cover around 13 square feet, with a thin pour, and so should most table top epoxy products.
Just keep in mind that deep pour and table top epoxies shouldn’t be mixed together (other than to use a single layer of table top epoxy as a finish on the very top once your deep pour dries).