This free epoxy resin calculator tells you how much mixed epoxy a woodworking pour needs, in gallons, quarts, liters, and fluid ounces, from your project's shape, size, and depth. It also splits the total into Part A and Part B, counts the layers a deep pour needs, and estimates the cost.
Mix 1.54 gal (197 fl oz) of epoxy for this rectangular pour: 0.77 gal Part A and 0.77 gal Part B at 1:1, poured in 1 layer, for about $138.86.
Gallons = length × width × depth × (1 + waste ÷ 100) ÷ 231
Pours = ceil(depth ÷ max pour depth)
Mix 1.54 gal (197 fl oz) of epoxy for this rectangular pour: 0.77 gal Part A and 0.77 gal Part B at 1:1, poured in 1 layer, for about $138.86.
Estimate from kingtutwoodshop.com/tools/epoxy-resin-calculator. Buy kits that add up to at least the total above, and follow your resin label for ratio, depth, and cure times.
Start from a cutting board seal coat, tabletop, round top, river table, or mold preset, or choose rectangle, circle, or river channel yourself.
Enter length and width for a rectangle, diameter for a circle, or length and average width for a river channel, then the pour depth.
Add a waste allowance for drips, mixing cups, and wood absorption, then choose the 1:1 or 2:1 volume ratio printed on your resin kit.
Enter the maximum depth per pour from the resin label and the price per gallon of mixed kit to see the pour count and cost.
Review the Part A and Part B amounts, layer plan, and assumptions, then print the shopping list before you buy.
Multiply the pour area by the depth in inches to get cubic inches, add a waste allowance, then divide by 231 to convert to US gallons. For a circle, the area is π times the radius squared. For a river table, use the channel length times its average width.
A 72 inch river with an 8 inch average width poured 1.5 inches deep holds about 3.7 gallons before waste. Add 10% to 15% for leaks, wood absorption, and mixing loss, and use a deep pour resin rated for the depth.
The ratio is resin (Part A) to hardener (Part B) by volume. A 1:1 kit uses equal amounts of each, which is common for tabletop and seal coats. A 2:1 kit uses two parts resin to one part hardener, which is common for thicker and deep pour epoxies. Always follow your label.
Epoxy releases heat as it cures. Pouring deeper than the label's maximum depth can overheat, crack, yellow, or trap bubbles. Split the total depth into layers no thicker than the limit and pour each one within the recoat window.
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