Epoxy Calculator: Gallons for Floors, Tables and Pours
Work out how much epoxy a floor, countertop, table or river pour needs from the area and thickness, in gallons, liters, kits and cost. Pick a floor coating, a countertop or tabletop flood coat, or a river table or deep pour, enter the size and the thickness, and get the gallons with waste, liters and fluid ounces, the resin and hardener split, the pours, kits and cost.
Your numbers
Type the square feet to use them instead of length × width.
1 mil is 1/1,000 in. 12 mils is only a starting point: use the thickness on the product's data sheet.
100% for most solvent-free epoxy. A water-based coating with 50% solids needs twice the wet volume for the same dry film.
For drips over the edges, what stays in the bucket and the roller. 10% is a starting point; use your own figure.
By volume, as printed on the kit: 1 and 1 for 1:1, 2 and 1 for 2:1.
Gallons of mixed epoxy in one kit (resin + hardener), to count the kits.
Epoxy to buy
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- In liters
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- In fluid ounces
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- Before waste
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- Per coat, before waste
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- Coverage per coat
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- Resin (A) + hardener (B)
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- Epoxy cost
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Coverage, solids, pour depth and mix ratio differ between products: the data sheet of the product you buy decides. Porous concrete and bare wood soak up more on the first coat.
The calculation runs in your browser and ParrotNotes does not store your numbers. They sit in the page address so you can bookmark or share the result.
How to use the epoxy calculator
Pick the job: a floor coating, a countertop or tabletop flood coat, or a river table or deep pour. Enter the length and width in feet (for a floor you can type the square feet instead), then the thickness, the waste allowance and the mix ratio from the kit. Add the kit size and price to count the kits and the cost.
Worked example: a 6 × 2 ft river table, 1.5 in deep, where the river is 40% of the top. 72 × 24 × 1.5 × 0.4 = 1,036.8 cubic inches, which is 4.49 gallons; with 10% waste, 4.94 gallons. If the resin allows 1/2 in a pour, that is 3 pours of 1.65 gallons. At 2:1 it is 3.29 gallons of resin and 1.65 of hardener, so 4 kits of 1.5 gallons.
Floor coatings: mils, solids and coverage
Floor epoxy is specified by film thickness in mils. Because a gallon is 231 cubic inches, one gallon covers 1,604 sq ft at 1 mil, 160 sq ft at 10 mils and 80 sq ft at 20 mils, if the coating is 100% solids. A coating with less than 100% solids loses its solvent or water as it dries, so it takes more wet material for the same dry film: enter the volume solids from the data sheet.
Data sheets often give the coverage instead. Benjamin Moore lists 100 to 150 sq ft per gallon for its 100% solids floor epoxy, which works out to about 10.7 to 16 mils a coat. Switch to coverage, type the figure for one coat and the number of coats, and the calculator does the rest. Bare, porous concrete drinks more on the first coat, so plan the waste with that in mind.
Tabletops, countertops and river tables
A flood coat is a volume: length × width × thickness. In inches, divide the cubic inches by 231 for gallons; 1 gallon is 128 fluid ounces and 3.785 liters. The waste allowance covers what runs over the edges and what stays in the bucket; seal the wood first, or the first coat soaks in.
For a river table, measure the whole top and enter the share that is resin, or measure the river alone and leave it at 100%. A deep pour has to go in layers no thicker than the product allows, so enter the data sheet's maximum and the calculator gives the number of pours and the gallons for each.
Mix ratio and kits
Kits are sold as resin and hardener in a fixed ratio, commonly 1:1 or 2:1 by volume. Enter the two numbers from the label and the calculator splits the total. For the kit size, enter the total of both parts in gallons (check whether the label gives the total or each part) to count the kits, and price per kit or per gallon.
The rest of the job
The Square Footage Calculator adds up rooms and odd shapes for the floor area. For a floor that gets tile, vinyl or wood instead, the Flooring Calculator counts the boxes, and the Paint Calculator does walls and ceilings. If the slab is new, the Concrete Calculator works out the concrete first.
For floor coating and countertop contractors
The numbers in an epoxy quote come from the walk-through: the size of the garage, the cracks and oil stains to deal with, the flake or metallic finish the customer liked, and whether they want a topcoat. A forgotten detail means a second visit, or a kit short on the day.
Sources, each read on 2026-10-24. All results are estimates; the data sheet of your product decides:
- NIST Handbook 44, Appendix C: 1 US gallon = 231 cubic inches = 3.785411784 liters
- Benjamin Moore High Performance 100% Solids Epoxy: 100 to 150 sq ft per gallon
- SikaBiresin TD150 product data sheet (German): pour depth 35 mm at 23 °C to 80 mm at 17 °C; mix 100:45 by weight, 100:50 by volume
- WEICON Gießharz Plus 90 data sheet (German): up to 90 mm a pour; mixed density 1.1 g/cm³; mix 100:42 by weight, 100:50 by volume
More for flooring and home improvement pros: Flooring sales, Home improvement sales, Quote follow-up email.
The square footage is said on the walk-through
Floor size, the finish the customer wants, the cracks to fill and the second coat they ask about all get said out loud on site. Record the walk-through in ParrotNotes and get a transcript, a summary and the action items, so the quote matches what was agreed.
Get Started FreeRelated tools
- Square Footage CalculatorWork out square footage for rectangles, L-shaped rooms, triangles and circles, add rooms together, and convert to square yards, square meters and acres.Open the tool
- Flooring CalculatorWork out how much flooring a room needs in square feet and boxes, with waste for the layout, underlayment, trim and cost.Open the tool
- Paint CalculatorWork out how many gallons of paint a room needs from the walls, doors, windows and coats, and what it will cost.Open the tool
- Concrete CalculatorWork out the concrete for a slab, footing, column or steps in cubic yards, the number of 60 and 80 lb bags and the cost, with a waste allowance.Open the tool