How this calculator works
A pour of epoxy is a thin slab of liquid, so the amount is its volume: the area of the surface times the depth of the pour. A US gallon is 231 cubic inches and a fluid ounce is 1.8047 cubic inches, so you can convert straight to the units the resin is sold in. Then add a margin, and split the total at the mix ratio.
Worked example: a 48 × 24 in tabletop flooded 1/8 in deep: 48 × 24 × 0.125 = 144 in³. With 10% extra that is 158.4 in³, or 87.8 fl oz (0.69 gal). At a 1:1 ratio, that is 43.9 fl oz of resin and 43.9 fl oz of hardener.
Epoxy for a flood coat, in fluid ounces, 10% extra
Rectangular surfaces. Double the depth to double the amount.
| Surface | 1/16 in coat | 1/8 in coat | 1/4 in pour |
|---|---|---|---|
| 12 × 12 in | 5.5 fl oz | 11.0 fl oz | 21.9 fl oz |
| 24 × 24 in | 21.9 fl oz | 43.9 fl oz | 87.8 fl oz |
| 48 × 24 in | 43.9 fl oz | 87.8 fl oz | 175.5 fl oz |
| 60 × 30 in | 68.6 fl oz | 137.1 fl oz | 274.3 fl oz |
| 72 × 36 in | 98.7 fl oz | 197.5 fl oz | 395.0 fl oz |
Tips before you buy
- Pour in layers within the maximum depth on the label. Thick pours generate heat as they cure, and a pour that is too deep can crack, yellow or cook. Tabletop epoxy is meant for thin coats, and deep-pour resin for 1 to 2 in at a time.
- Mix exactly as the label says, for as long as it says, scraping the sides and bottom of the cup. Wrong ratios or poor mixing give soft, sticky spots that never cure.
- Seal wood, concrete or any porous surface first with a thin coat. It stops air from bubbling out of the material into the pour.
- Epoxy needs a level surface and a warm room (around 70 to 75°F). Cold epoxy is thick and traps bubbles, and cures slowly.
- Make a little extra rather than too little. A pour cannot be paused to mix more, and a seam where two batches meet can show.
- Wear nitrile gloves and a respirator rated for organic vapors in a ventilated space. Uncured epoxy is a skin sensitizer.
Tools & materials for this project
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Frequently asked questions
How much epoxy do I need for a 4x2 foot table?
About 88 fl oz (0.69 US gallon) for a 1/8 in flood coat with 10% extra, which is 44 fl oz of resin and 44 fl oz of hardener at 1:1.
How do I calculate epoxy resin volume?
Multiply the length by the width by the depth in inches to get cubic inches. Divide by 231 for US gallons, or by 1.8047 for fluid ounces.
How deep can I pour epoxy at one time?
It depends on the product. Tabletop and coating resins are designed for about 1/8 to 1/4 in per pour, and deep-pour resins for 1 to 2 in. Follow the label, because a thick pour of thin-pour resin overheats.
Is epoxy mixed by volume or weight?
Some products are 1:1 by volume, and others are ratios by weight or by volume (such as 2:1). The label says which, and measuring the wrong way gives a wrong mix.
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Related calculators & guides
Estimates only. Results assume standard materials and simple shapes. Supplier products vary, and the final call on quantity, structure and safety is yours. Check your local code and your supplier's guidance before ordering.