Epoxy Resin Calculator
Work out how much epoxy resin you need for a table top, river table, countertop or art pour, with exact Part A and Part B amounts for your mix ratio.
How it works
Enter the length and width of the surface in inches and the depth of your pour. A typical flood coat on a table top is 1/8 inch, written as 0.125. River tables and deep pours can be one or two inches, but always stay within the maximum pour depth printed on your product, or pour in several layers.
Add a waste allowance. Resin drips over edges, sticks to mixing cups and soaks into raw wood, so 10% to 15% extra is common. Porous wood such as walnut or live edge slabs may need a thin seal coat first, which you can calculate separately with a smaller depth.
Finally, enter the mix ratio from the label. Many coating epoxies mix 1:1 by volume, while deep pour resins are often 2:1 or 3:1. The calculator converts cubic inches into US gallons, fluid ounces and liters, then splits the total into resin and hardener so you can measure each part accurately.
Formula
volume (in³)
Where:
- 231
- = Cubic inches in one US gallon
- A, B
- = Resin and hardener parts in the mix ratio
- waste
- = Extra percentage for drips and cup residue
Worked example
A 48 by 24 inch table top with a 1/8 inch flood coat holds 48 × 24 × 0.125 = 144 cubic inches. Adding 10% waste gives 158.4 cubic inches.
That is 158.4 ÷ 231 = 0.686 gallons, or about 87.8 fluid ounces. With a 1:1 ratio you would measure roughly 43.9 fluid ounces of resin and 43.9 fluid ounces of hardener.
Tips for a successful epoxy pour
Work in a room between 70 and 80 degrees Fahrenheit and warm both bottles before mixing so bubbles rise out easily. Mix for the full time on the label, scraping the sides and bottom of the cup, then pour into a second clean cup and mix again to avoid soft, sticky spots. Seal porous wood with a thin coat first so air does not escape into the main pour.
Deep pour resins cure slowly to control heat, so only pour the depth your product allows per layer. Tape the underside edges of a table to catch drips, and use a torch or heat gun lightly to pop surface bubbles. Wear gloves and a respirator rated for organic vapors, and keep the area ventilated.
Frequently asked questions
Multiply length by width by depth in inches, add 10% for waste and divide by 231 to get gallons. A 4 by 2 foot table with a 1/8 inch coat needs about 0.7 gallons.
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For informational purposes only. This calculator does not provide professional engineering advice. Consult a qualified professional before making decisions based on these results.