Epoxy Resin Calculator: Tabletops, River Tables & Floors

Use this epoxy calculator to find how much epoxy resin you need for a tabletop, a river table, a round piece of resin art or a garage floor. Enter the size and depth of the pour, or the floor area and coats. You get the total, the amounts of resin and hardener, and the kits to buy.

Length

Width

Diameter

Depth

Share filled with resin

For a river table, enter the share of the area that is river.

Mix ratio (resin : hardener)

Floor area

sq ft

Coats

Thickness per coat

mils

Solids content

Kit size, extra and cost

Kit size (both parts)

gal

Extra for mixing cups and drips

Price per kit

–

–kits

–estimated cost

Check the most each layer can be poured. Coating resins are usually poured about ⅛ in at a time, and deep pour resins up to 1 or 2 in.

How the epoxy calculator works

Resin volume = area × depth, in cubic inches. For a river table, it is multiplied by the share of the area that is river.
Gallons = cubic inches ÷ 231, plus 10% for mixing cups and drips. 1 gallon = 128 fl oz = 3.785 liters.
Resin and hardener are split by the mix ratio, such as 1:1 or 2:1 by volume
Floor coatings: gallons per coat = area × mils ÷ (1,604 × solids content). One gallon of 100% solids epoxy covers 1,604 sq ft at 1 mil thick.
Kits = total gallons ÷ kit size, rounded up

This calculator is for resin pours and coatings. For epoxy anchor adhesive in concrete, use the anchor maker’s own guide.

Worked example

A 48 × 24 in tabletop with a ⅛ in flood coat of 1:1 epoxy:

Area: 48 × 24 = 1,152 sq in
Volume: 1,152 × 0.125 = 144 cu in, plus 10% = 158.4 cu in
Gallons: 158.4 ÷ 231 = 0.69 gallons, which is 87.8 fl oz
Mix: 43.9 fl oz of resin and 43.9 fl oz of hardener, so 1 kit of 1 gallon

A river table of the same size, 2 in deep, where the river is 30% of the top, takes 691 cu in plus 10%, or 3.29 gallons. That is 4 one-gallon kits, poured in layers. A 2-car garage floor of 400 sq ft with 2 coats at 10 mils of 100% solids epoxy takes 2.49 gallons per coat, or 5.49 gallons with 10% extra.

Epoxy for common pours

Project	Depth	Epoxy, with 10% extra
24 in round art piece	⅛ in	About 34.5 fl oz
48 × 24 in tabletop	⅛ in	About 87.8 fl oz (0.69 gal)
48 × 24 in tabletop	¼ in	About 1.37 gal
48 × 24 in river table, 30% river	2 in	About 3.29 gal

Floor coating coverage

Thickness per coat	Sq ft per gallon at 100% solids	Sq ft per gallon at 50% solids
6 mils	About 267	About 134
8 mils	About 200	About 100
10 mils	About 160	About 80
16 mils	About 100	About 50

Tips for epoxy projects

Check the deepest pour your resin allows. Coating resins are usually poured about ⅛ in at a time. Deep pour resins can go 1 to 2 in, and a thicker pour can overheat and crack.
Seal wood with a thin coat first, so air in the grain doesn’t rise as bubbles in the main pour.
Measure resin and hardener carefully by the ratio on the label, and mix for as long as it says, scraping the sides of the cup.
For a garage floor, the concrete must be clean, dry and roughened, usually by grinding or etching, or the coating can peel. New concrete needs to cure first. The concrete calculator covers a new slab.
Work in a warm room, often 70 to 80°F, with good airflow, gloves and eye protection.
For a tiled floor instead, the tile calculator works out tiles and boxes.

Frequently asked questions

How much epoxy resin do I need?

Multiply the length by the width by the depth in inches to get cubic inches, then divide by 231 for gallons. Add about 10% for what stays in the cups. A 48 × 24 in tabletop with a ⅛ in coat needs about 0.69 gallons.

How much epoxy do I need for a river table?

Work out the area of the river only, then multiply by the depth of the slab. If the river is 30% of a 48 × 24 in table that is 2 in thick, it takes about 3.3 gallons with extra, poured in layers as deep as the resin allows.

How many square feet does a gallon of epoxy cover?

For floors, one gallon of 100% solids epoxy covers about 160 sq ft at 10 mils thick. For a ⅛ in flood coat on a tabletop, one gallon covers only about 12.8 sq ft, because that coat is much thicker.

How much epoxy do I need for a garage floor?

For a 2-car garage of about 400 sq ft, two coats at 10 mils of 100% solids epoxy take about 5 gallons, or 5.5 with extra. Water-based kits have lower solids and cover differently, so follow the kit’s coverage.

What does a 1:1 or 2:1 mix ratio mean?

It is the amount of resin to hardener by volume. With 1:1, a 32 fl oz batch is 16 fl oz of each. With 2:1, it is about 21.3 fl oz of resin and 10.7 fl oz of hardener. Always use the ratio on your product.

Results are estimates for planning. Pour depths, mix ratios and coverage vary by product, so follow the label. See How We Calculate for the formulas we use.