PourMath

Epoxy cost estimator

Published October 3, 2026

Quick answer

Divide the mixed resin you need by the mixed volume of one package and round up; multiply by the package price and add other supplies. The calculator never assumes a price: you enter what you were quoted.

Cost estimator
Units
gal

From the river table, mold or flood coat calculator.

gal

The mixed volume one kit makes, as printed on the label.

price

Enter the price you were quoted. This site stores no prices.

How you buy
price
Estimated totalEnter a price2 packages
Resin cost–
Left over after the pour0 fl oz
Effective price of resin used–

How the estimate works

Resin is sold in kits: a Part A container and a Part B container sized so that the two together make a stated amount of mixed epoxy. For most projects the question is how many kits to buy, and what the leftover resin costs you. The estimator answers both.

Prices change often and differ by country and seller, so the site does not store any. Type the price you were quoted for one package. Everything else is arithmetic.

Formula and assumptions

Whole packages (the usual case):

packages = ⌈ Vneeded ÷ Vpackage ⌉    cost = packages × price + other costs

Paying only for what you use (bulk buying, shared drums, or pricing a job for a client):

cost = (Vneeded ÷ Vpackage) × price + other costs

  • Vneeded is the mixed volume from another calculator, including your mixing-loss allowance.
  • Vpackage is the combined mixed volume of one kit. For example, 1 gal of Part A plus 0.5 gal of Part B makes 1.5 gal of mixed resin. Check the label: a kit’s name does not always state its mixed volume.
  • Leftover is what remains after the pour when you buy whole packages. Whether you can use it later depends on the product’s shelf life, which many data sheets state.
  • Effective price divides the money spent on resin by the resin you actually use. It makes kits of different sizes comparable.

Volume conversions use exact definitions (1 US gal = 3.785411784 L, NIST), so switching between US and metric does not change the answer.

Worked example

A river table needs 5.3 gal of mixed resin. The product is sold in 1.5 gal kits. You enter the price you were quoted, written here as P.

  1. Packages: 5.3 ÷ 1.5 = 3.53, rounded up to 4 kits (6 gal of mixed resin).
  2. Resin cost: 4 × P.
  3. Leftover: 6 − 5.3 = 0.7 gal.
  4. Effective price: 4P ÷ 5.3 = 0.75 × P per gallon used, compared with 0.67 × P per gallon if nothing were left over.

If the same product also came in a 3 gal kit at a lower price per gallon, compare the two by entering each kit’s size and price in turn; the effective price row makes the comparison direct.

What the estimate leaves out

  • Seal coat. If you seal the wood with a different product, price it separately or add it to “other costs”.
  • Consumables. Tape, mold release, mixing buckets, stir sticks, gloves and respirator cartridges add up. Put them in “other costs”.
  • Shipping and tax, which depend on where you buy.

Sources

  1. NIST. Handbook 44 (2026), Appendix C: General Tables of Units of Measurement. Accessed September 30, 2026.