How much epoxy do I need?
It depends on the job. Floor coatings are thin, so you work from coverage per gallon. Table tops and river tables are pours, so you work from volume. One US gallon is 231 cubic inches.
Floor: gallons = sq ft × coats ÷ coverage per gallon
Pour: gallons = length (in) × width (in) × depth (in) ÷ 231
A 20 × 20 ft garage is 400 sq ft. Two coats of 100% solids epoxy at 160 sq ft per gallon take 400 × 2 ÷ 160 = 5 gallons. A 6 × 3 ft table top at 1/8 in is 72 × 36 × 0.125 = 324 cu in, or 1.40 gallons. With 10% for drips and soak-in that's 1.54 gallons, so two 1 gallon kits.
| Pour depth | Sq ft per gallon |
|---|---|
| 1/16 in | 25.7 |
| 1/8 in | 12.8 |
| 1/4 in | 6.4 |
| 1/2 in | 3.2 |
| 1 in | 1.6 |
| 2 in | 0.8 |
These are exact volumes with nothing added for waste. Kit sizes are the combined resin and hardener.
Garage floor epoxy
Coverage depends on solids content and film thickness. One gallon spread 1 mil thick covers 1,604 sq ft, so 100% solids epoxy at 10 mils covers about 160 sq ft per gallon. Water-based epoxy goes on thinner and typically covers around 250 sq ft per gallon per coat: 400 × 2 ÷ 250 = 3.2 gallons, or 4 one-gallon kits. Use the coverage on your product's label.
Bare concrete soaks up more on the first coat. Grind or etch the slab as the maker specifies, and check for moisture before you coat.
Table top epoxy calculator
Table top or bar top epoxy is poured as a flood coat about 1/8 in thick, which is roughly how deep it self-levels. Add 10–15% for what runs off the edges. For a round table, pick the circle shape and enter the diameter: a 4 ft round top at 1/8 in takes 1.08 gallons with 10% extra.
Deep pour epoxy calculator
For a river table, measure the river's length and its average width, and use the slab thickness as the depth. A river 6 ft long, 12 in wide on average and 2 in deep is 72 × 12 × 2 = 1,728 cu in, or 7.48 gallons. With 10% extra that's 8.23 gallons, or 6 kits of 1.5 gallons.
Every deep pour resin lists a maximum depth per pour. Pouring thicker can overheat and crack. Enter the label's number and the calculator shows how many pours you need. Seal the wood with a thin coat first so it doesn't release bubbles into the pour.
Pricing an epoxy floor job
Floor coating contractors usually price per square foot, covering grinding, crack repair, the base coat, any flakes and the topcoat. Use contractor mode to add labor and markup, then send it with the estimate template.
Questions
How much area does a gallon of epoxy cover?
As a floor coating, about 160 sq ft per gallon for 100% solids epoxy at 10 mils. As a pour, about 12.8 sq ft at 1/8 in deep and 1.6 sq ft at 1 in deep.
How much epoxy do I need for a garage floor?
A 400 sq ft garage takes about 5 gallons for two coats of 100% solids epoxy at 160 sq ft per gallon. Use the coverage on your product's label.
How many ounces of epoxy do I need?
Multiply gallons by 128. A 6 × 3 ft table top at 1/8 in takes about 1.54 gallons with 10% extra, or about 197 fl oz.
How deep can I pour epoxy in one layer?
It depends on the product. Table top epoxy is usually poured about 1/8 in per coat, and deep pour resins list a maximum depth per pour. Follow the label to avoid overheating.