Epoxy Resin Calculator
Epoxy for a pour — slab, river channel, round or known volume — with pieces, waste, part A and B at the maker’s ratio by volume or weight, and kits to buy.
The mixed resin in litres, US gallons and fluid ounces, how much of part A and part B to measure at the product’s ratio, the weight at its density, and how many kits of the size you buy.
Example: A 48 × 12 in river channel 1.5 in deep with 10 % waste needs 15.6 L of mixed epoxy — 7.8 L each of part A and B at 1 : 1 — or four 4 L kits.
Volume first,
then the ratio.
How the pour volume is found, how waste and partial fills enter, how the mix is split by volume or weight, and what the product sheet still decides.
The pour
Resin fills a volume: length × width × depth for a slab or a river channel, π·r²·depth for a round, or a volume you already know. Several identical pieces multiply it; a share filled below 100 % covers a river table where wood takes part of the footprint. Inches are converted at 16.39 ml per cubic inch.
Waste and kits
Resin left in the cup, on the stirrer and in seal coats is real; the waste percentage is yours and is added to the pour. Kits are the mixed volume one kit makes, rounded up.
Mixing ratio
Epoxies are mixed at the maker’s ratio — 1 : 1, 2 : 1 — by volume or by weight, and the two are not the same because the parts have different densities. By volume the mixed volume is split directly; by weight the page needs the mixed density from the product sheet and splits the weight.
What the number does not settle
Maximum pour depth, working time, cure temperature and whether the wood needs sealing first are the product’s instructions; a deep pour in a fast resin can overheat and crack. Inputs stay in your browser; the same anonymous usage counts as the rest of the site apply.