Table Top Epoxy Calculator

Enter a tabletop's size, coat thickness and number of coats and get the gallons of epoxy to mix, with edges, an allowance for drips and the resin/hardener split.

Construction & DIYWorldwideSource: Volume arithmetic (231 in³/gal, NIST HB 44); cross-checked to TotalBoat's 12.8 sq ft/gal at 1/8 inFree, no sign-up

Table shape

Units for size

Length

Width

Thickness of each coat

Number of coats

Extra for absorption, cups and drips (%)

Mix ratio by volume (resin : hardener)

Coat the edges too

The answer updates as you type; nothing is sent anywhere.

18 sq ft × 1 coat

1.54 gallons of mixed epoxy

6.2 quarts · 197 fl oz · 5.84 litres. At 1:1 by volume: 0.77 gal resin + 0.77 gal hardener.

The arithmetic

Area 2,592 sq in top × coat thickness × coats = 356 cubic inches ÷ 231 cubic inches per gallon = 1.543 gal.

What this page cannot tell you

Porous or open-grain wood soaks up resin in the first coat, and some runs off the edges; neither has a published figure, so use the extra allowance. Follow your product’s own mix ratio, pour depth and temperature limits.

How to work out epoxy for a tabletop

Enter the top's size. Pick rectangle or round and enter the length and width, or the diameter, in inches, feet or centimetres.
Set the coats. Choose the thickness of each coat (1/8 inch is the usual self-levelling flood coat) and how many coats you plan.
Add edges and an allowance. Tick edges if the resin will run down the sides, and add a percentage for what soaks in, stays in the cup and drips off.
Read the quantity. The result is the mixed volume in gallons, quarts, ounces and litres, split into resin and hardener at your product's ratio.

10 situations where a table top epoxy calculation helps

Buying the right kit size for a dining table

A 72 × 36 inch top at 1/8 inch needs about 1.4 gallons per coat, so a 1-gallon kit falls short and a second trip to the store mid-pour is avoided.

Coating a bar top

Long, narrow bar tops have a lot of edge; including edges shows how much more resin runs down the sides.

Planning a seal coat plus flood coats

Entering the number of coats gives the total for the whole job, not just one pour.

Sealing a round café table

The round option uses the diameter so the area isn't overestimated as a square.

Pricing a commission

A woodworker can turn the gallons into a materials cost before quoting a client.

Working in metric

Enter centimetres and read litres for products sold by the litre.

Checking a 2:1 product

Products with other ratios get the right split of resin and hardener.

Avoiding too-thick pours

The tool flags coats thicker than the 1/4-inch maximum TotalBoat gives for a flood coat.

Coating a countertop or desk

Any flat rectangular surface works the same way as a table.

Comparing one thick coat with two thin ones

Changing coat thickness and count shows the volume difference straight away.

How the quantity is worked out

Volume = coated area × coat thickness × number of coats. The area is length × width for a rectangle or π × diameter² ÷ 4 for a round top, plus perimeter × edge height if you coat the edges. One U.S. gallon is 231 cubic inches (NIST Handbook 44, Appendix C).

This reproduces a manufacturer's published figure: TotalBoat lists its 1-gallon TableTop Epoxy kit as covering 12.8 square feet at 1/8 inch thick, and 231 ÷ (144 × 0.125) = 12.83 square feet. TotalBoat's guide also says each flood coat should be no thicker than 1/4 inch to prevent overheating or distortion, which is why thicker coats are flagged.

Mix ratios vary between products; TotalBoat's is 1:1 by volume, which is the default. Change it to match your product's label. Everything is calculated in your browser and nothing is stored.

Limits: raw or open-grain wood absorbs resin, some resin stays in the mixing cup and some runs off — none of these has a published figure, so the extra allowance is yours to set. This is not a substitute for your product's instructions on depth, temperature and cure.

Sources

TotalBoat TableTop Epoxy — product page — 12.8 sq ft per gallon at 1/8 in; 1:1 by volume; up to 1/4 in for surface coatings
TotalBoat — How to epoxy a table top — Seal coat plus flood coats; each flood coat no thicker than 1/4 in
NIST Handbook 44, Appendix C — 1 gallon = 231 cubic inches

Frequently asked questions

How much epoxy do I need for a table top?

Multiply the area in square inches by the coat thickness in inches and the number of coats, then divide by 231 to get gallons. A 6 × 3 ft table at 1/8 inch takes about 1.4 gallons per coat.

How many square feet does a gallon of epoxy cover?

At 1/8 inch thick, one gallon covers 231 ÷ 18 = about 12.8 square feet, which matches TotalBoat's published figure.

How thick should a table top epoxy coat be?

Self-levelling table top epoxy is typically poured as a 1/8-inch flood coat. TotalBoat's guide says each flood coat should be no thicker than 1/4 inch.

Do I need a seal coat?

TotalBoat's guide recommends a seal coat plus one or two flood coats, the seal coat blocking air from the wood that would otherwise cause bubbles. Add it as an extra coat in the calculator.

How much extra epoxy should I mix?

There is no single published figure. Open-grain wood, edges and cup residue all use extra, so set the allowance to suit your job.

How do I split the resin and hardener?

Use your product's ratio by volume. The calculator divides the total by the ratio you enter; 1:1 is the default.

Can I use this for a river table?

Not for the river itself — that is a deep pour, measured as a volume, and needs a deep-pour product. This page is for surface coats.