Resin Calculator
Enter the shape, size and pour depth, pick the mix ratio, and get the mixed resin in fluid ounces, millilitres and grams, split into Part A and Part B, with waste allowed and the smallest kit that covers it.
1/8 in flood coat; 1/4 to 2 in casting; check the resin's max depth
mixing cup loss and edge run-off
Mixed resin
65.8 fl oz
1947 ml · 2141 g · 1.95 L
Part A
32.9 fl oz
973 ml
Part B
32.9 fl oz
973 ml
Smallest kit
1 gallon kit
864 sq in × 0.125 in = 108 cu in
Volume = area × depth; 1 cu in = 16.39 ml = 0.554 fl oz. Weight assumes 1.1 g per ml, typical for epoxy. Part A and B are split by volume for the ratio you chose; if your resin is mixed by weight, use the gram figure and the ratio on the label.
Flood coat and casting volumes for common pieces
Mixed resin with 10% waste, 1:1 ratio. A flood coat is 1/8 inch; the casting column is a 1/2-inch pour.
| Piece | Sq in | Flood 1/8 in | Each part | Cast 1/2 in |
|---|---|---|---|---|
| Coaster, 4 in round | 13 | 1 fl oz | 0.5 fl oz | 4 fl oz |
| Charcuterie board 10 × 18 | 180 | 13.7 fl oz | 6.9 fl oz | 55 fl oz |
| Serving tray 12 × 18 | 216 | 16.5 fl oz | 8.2 fl oz | 66 fl oz |
| Side table 20 × 20 | 400 | 30.5 fl oz | 15.2 fl oz | 122 fl oz |
| Coffee table 24 × 48 | 1152 | 87.8 fl oz | 43.9 fl oz | 351 fl oz |
| Bar top 24 × 96 | 2304 | 175.5 fl oz | 87.8 fl oz | 702 fl oz |
| Dining table 40 × 72 | 2880 | 219.4 fl oz | 109.7 fl oz | 878 fl oz |
Depth, heat and layers
Epoxy cures by an exothermic reaction, and a thick mass holds its own heat: pour a tabletop resin two inches deep and it can yellow, crack or boil. Tabletop and art resins are rated for 1/8 to 1/4 inch per layer; deep-pour resins for 1 to 2 inches, sometimes more, because they cure slowly. The calculator gives the total volume; divide it into layers of the depth your resin allows, and let each reach a tacky set before the next. Warm the bottles to about 75°F before mixing so the parts flow and measure evenly, mix for three minutes scraping the sides, then pour.
Frequently Asked Questions
How much resin do I need for a flood coat?
Area in square inches times 0.125 inches, times 16.39 to get millilitres, or times 0.554 to get fluid ounces. A 24 × 36 inch tabletop is 864 square inches, so a 1/8-inch flood coat is 108 cubic inches, about 60 fluid ounces of mixed resin, or 66 with 10% for waste. That is a 1:1 kit of 33 oz of each part; buy the gallon kit or two 32 oz kits.
How do I calculate resin for a river table or a mold?
The same way, with the real depth: length × width of the channel × depth. A 4 × 40 inch river 1.5 inches deep is 240 cubic inches, about 133 fl oz. Deep pours need a deep-pour resin that cures slowly enough to shed heat; most tabletop resins are limited to 1/4 inch per layer, so check the label and pour in layers if needed.
How much does resin weigh?
About 1.1 grams per millilitre, a little heavier than water, so 1 litre of mixed resin is roughly 1.1 kg and 32 fl oz is about 1,040 g. The calculator gives grams for resins that are mixed by weight; use the ratio printed on the label, since a 1:1 by volume system is not 1:1 by weight.
Why add extra?
Resin clings to the mixing cup and stir stick, and a flood coat runs over the edges. Ten percent covers a normal pour; use 15% for a first attempt or a piece with many edges, and 5% for a mold with a lid. Running out mid-pour means a visible seam.
What is a seal coat?
A thin first layer, about 1/16 inch, brushed on porous surfaces like wood so the flood coat does not bubble as air escapes. The calculator's 1/16 option sizes it; let it tack up before the flood coat.
These tools use the standard craft-room rules (resin volume by area and depth, quilt overhang and width-of-fabric piecing, yards per square inch by yarn weight, wax weight per fluid ounce, gauge ratios), all stated on each page. Materials vary by brand: check your resin's mix ratio, your wax's fragrance limit and your own swatch, and buy a little over.