Resin Calc

Epoxy Coverage Calculator

For coatings rather than castings. Enter the area you are covering and how thick each coat is, and get the volume in gallons as well as the Part A and Part B split.

Coverage Calculator

Surface
ft
ft
in

Most table top epoxies are poured at 1/8 in per coat. Check your data sheet for the maximum.

A seal coat plus a flood coat counts as two.

Common thicknesses
Floor coatings

Coverage results

Total Epoxy Needed

702.2fl oz

Buy at least

5.486gal

Per coat

351.1fl oz

APart A (Resin)

351.1fl oz

BPart B (Hardener)

351.1fl oz

Surface area
32 sq ft
Coverage rate
12.83 sq ft per gal

At the thickness you set, one gal of mixed epoxy covers this much.

Recommended for this pour

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Table Top / Coating Epoxy

Self-levelling, glass-clear and cures hard in 24 hours. Best for pours under 1 inch, bar tops and coatings. Usually sold as a 1:1 mix, but check your product.

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Essential mixing tools

How to Work Out Epoxy Coverage Per Square Foot

Coverage is the same volume calculation as a casting, just expressed differently. Instead of a cavity you have an area, and instead of a depth you have a film thickness. Multiply them and you get volume. For a cavity rather than a surface, use the epoxy volume calculator instead.

  1. 1

    Measure the area, not the perimeter

    Multiply length by width for a rectangular surface. For an irregular top, break it into rectangles, work each one out and add them together. Include any edges you intend to coat, since a dripped edge on a thick slab can use a surprising amount.

  2. 2

    Pick a realistic film thickness

    One eighth of an inch is the usual figure for a self levelling table top coat. Thinner coats at around one sixteenth are common for sealing and for art panels. Going much thicker in a single coat risks the same overheating problems as a deep pour.

  3. 3

    Count every coat

    Most finished surfaces are at least two applications: a thin seal coat that closes the pores, then a flood coat that levels out. Each coat uses its own volume, so a two coat job at an eighth of an inch needs roughly twice the material of a single coat.

  4. 4

    Convert to what you actually buy

    Epoxy is sold in gallons, quarts and litres, not fluid ounces. This calculator gives you both, so you can see straight away whether a project needs a quart kit or a two gallon kit. Round up, because kits do not come in half sizes, and the epoxy cost calculator will show which size works out cheapest.

How Far Does a Gallon of Epoxy Go?

A US gallon is 231 cubic inches. Divide that by your film thickness and you get the area it covers. The commonly quoted figure of 12 square feet per gallon comes from pouring at one eighth of an inch, with a little allowance for waste.

ThicknessCoverage per US gallon
1/32 inabout 51 sq ft
1/16 inabout 26 sq ft
1/8 inabout 13 sq ft
1/4 inabout 6.4 sq ft

These are exact geometric figures before waste. In practice you will lose some to mixing cups and to the wood absorbing the first coat, which is why the calculator adds an allowance.

Epoxy Coverage Questions

How much epoxy do I need for a 4x8 foot table?

A 4 by 8 foot surface is 32 square feet. At one eighth of an inch you need roughly 320 fl oz, or about 2.5 gallons of mixed epoxy per coat before waste. Two coats roughly doubles it. Enter your own figures above for an exact answer.

How thick should a table top epoxy coat be?

Around one eighth of an inch per coat is standard for a self levelling coating epoxy. Thicker single coats generate more heat as they cure and are more likely to trap bubbles or discolour. Build depth with multiple coats instead.

Does coverage change with the mix ratio?

No. Coverage depends on the total mixed volume, which is what the calculator works out first. The ratio only decides how that total is split between Part A and Part B when you measure it out.

Should I include the edges of my table?

Yes, if you plan to coat them. Epoxy runs down the sides of a slab and a fair amount can end up on the floor. Add the edge area to your total, or increase the waste allowance if you would rather keep the maths simple.

How many coats of epoxy do I need?

Two is typical for bare wood: a thin seal coat to stop bubbles, then a flood coat to level. Porous or open grain timber sometimes needs a third. Each coat is a separate volume, so set the coat count rather than simply pouring thicker.

How much epoxy do I need per square metre of floor?

It depends on the system. A rolled floor coat or sealer goes on at about 0.2 to 0.4 mm, which manufacturers quote as roughly 0.3 to 0.5 kg per square metre per coat, or about 1 to 1.6 oz per square foot. A self-levelling floor is poured at 1.5 to 3 mm and, because it is filled with mineral, weighs about 1.6 to 1.7 kg per square metre for every millimetre. Pick a floor preset above, then match the thickness and density to your product's data sheet. Pricing a garage floor? The epoxy garage floor cost calculator compares doing it yourself with hiring a pro.

Why does a floor coating need more kilograms than casting resin?

Floor coatings are filled with pigment and mineral, so a litre weighs more: about 1.2 to 1.4 kg for a rolled coat and 1.6 to 1.7 kg for a self-levelling floor, against about 1.05 kg for clear casting resin. Porous concrete also soaks up the first coat, so allow 10 to 15 percent extra, or prime it first.