Epoxy Calculator
Your project
Mixed epoxy to buy
0.69 gal
- Fluid ounces
- 87.8 fl oz
- Liters
- 2.6 L
- Resin (1:1)
- 0.34 gal
- Hardener
- 0.34 gal
- Volume before extra
- 144 cu in
Theoretical volume. Follow the product label for mix ratio, maximum pour depth and pot life.
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Prices as of Oct 2, 2026, 4:36 AM UTC. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Epoxy for common pours
| Project | Size | Mixed epoxy | Fl oz |
|---|---|---|---|
| Coaster set (4) | 4 in round × 1/4 in | 0.05 gal | 7 |
| Serving board | 18 × 10 in × 1/8 in | 0.1 gal | 12.5 |
| Round side table | 24 in round × 1/8 in | 0.24 gal | 31.3 |
| Table top flood coat | 48 × 24 in × 1/8 in | 0.62 gal | 79.8 |
| Bar top | 96 × 24 in × 1/8 in | 1.25 gal | 159.6 |
| River table river | 72 × 6 in × 1.5 in | 2.81 gal | 359.1 |
Net volumes, before the extra for mixing cups and spills. Pours deeper than the product's rated maximum must go in layers — check the label.
Coating coverage by film thickness
| Wet film | Sq ft per gallon | Gallons per coat, 400 sq ft garage |
|---|---|---|
| 4 mils | 401 | 1 |
| 6 mils | 267 | 1.5 |
| 8 mils | 201 | 1.99 |
| 10 mils | 160 | 2.49 |
| 12 mils | 134 | 2.99 |
| 16 mils | 100 | 3.99 |
| 20 mils | 80 | 4.99 |
Theoretical coverage assumes a smooth, sealed surface. Bare, porous concrete drinks the first coat, so most floor systems start with a thin primer; the product sheet gives the film thickness it expects for each coat. Tiling the floor instead? Compare with the floor tile calculator, level a rough slab first with the self-leveling calculator, and note that epoxy grout is a different product — the epoxy grout calculator sizes it by the joint.
Do this math on the job site — in the free app
Smart Tile Calculator for Android: offline, in your pocket, free.
How this calculator works
Pour. Volume = length × width × depth (or π × diameter² ÷ 4 × depth for a round top), all in inches, times the number of pieces. A US gallon is exactly 231 cubic inches and 128 fluid ounces (NIST Handbook 44); a cubic inch is 16.387 mL.
Coating. Volume per coat = area (sq ft) × 144 × wet film thickness in mils ÷ 1,000. One gallon spread 1 mil thick covers 1,604 sq ft, so at 10 mils it covers about 160.4 sq ft. The dry film is the wet film × the product's volume solids — 100% solids epoxy dries as thick as it goes on.
Mix ratio. The label gives resin : hardener by volume (often 1:1 or 2:1). The mixed total is split in that proportion. If your kit gives a ratio by weight, follow the label and weigh it instead.
Worked example. A 48 × 24 in table top with a 1/8 in flood coat is 48 × 24 × 0.125 = 144 cu in = 0.62 gal (79.8 fl oz, 2.36 L); with 10% extra, 0.69 gal — a 1 gal kit at 1:1 is 0.34 gal of each part.
Frequently asked questions
How do I calculate how much epoxy I need?
Multiply length × width × depth in inches for cubic inches, then divide by 231 for US gallons (× 128 for fluid ounces). A 48 × 24 in table top poured 1/8 in deep is 144 cu in = 0.62 gal, or 79.8 fl oz. Add about 10% for what stays in the cup.
How much epoxy do I need for a river table?
Work out the river's volume, not the whole table's: a river 72 in long, 6 in wide on average and 1.5 in deep is 648 cu in = 2.81 gal. Deep pours usually have to go in several layers, so check the resin's maximum pour depth.
How much epoxy do I need for a garage floor?
Area × wet film thickness. 400 sq ft at 10 mils is 400 × 144 × 0.010 = 576 cu in, about 2.5 gal per coat (one gallon covers about 160 sq ft at 10 mils). Two coats is about 5 gal before waste; the product sheet gives the thickness each coat should be.
How many square feet does a gallon of epoxy cover?
1,604 sq ft at 1 mil, so divide 1,604 by the wet film thickness in mils: 160 sq ft at 10 mils, 100 sq ft at 16 mils. At 1/8 in (125 mils) a gallon covers just under 13 sq ft.
How do I split epoxy by mix ratio?
Divide the total by the parts. At 2:1 by volume, 3 gal of mixed epoxy is 2 gal of resin and 1 gal of hardener; at 1:1 it is half and half. Mix only what you can use within the product's pot life.
Related calculators
- Floor Tile CalculatorTiles and boxes for any floor, by room dimensions and tile size.
- Self-Leveling Compound CalculatorBags of leveler by area and depth of the low spots.
- Epoxy Grout CalculatorPounds and kits of epoxy grout by tile size, joint width and thickness.
- Pool & Patio Tile CalculatorWaterline bands, pool decks, patios and garage floor tile.
Guides worth reading next
- How to Measure a Room for Tile (Step by Step)Measure any room for floor or wall tile: handle closets and alcoves, convert inches to decimals, subtract fixtures, and add the right waste percentage.
- Choosing the Right Tile Size for Your RoomHow tile size changes a room: when 12×24 beats 4×4, why small rooms can take large tile, grout line math, and the flatness rule for big formats.
- Sanded vs Unsanded vs Epoxy Grout: Which One Do You Need?Grout types explained by joint width and location: when sand scratches tile, why epoxy wins in showers, and how much of each type a bag actually covers.