Resin Calc

Epoxy Cost Calculator

Epoxy is sold in fixed kit sizes, so you always buy more than you need. This compares the sizes you can actually buy and shows which one costs less once the leftover is counted.

Cost Calculator

gal

Take this from one of the other calculators, or enter your own figure.

Volume in
Kit options

Enter the sizes and prices you can actually buy. Leave a row blank to ignore it.

Option 1
gal
$
Option 2
gal
$
Option 3
gal
$

Cheapest way to buy

Cheapest total

$170.00

This is the cheapest option, so raising the price of a dearer one leaves it unchanged. Every option has its own total in the table below.

Best value

1 x 2 gal

Left over: 0 gal

Saves $50.00 against the priciest option

Shelf price

$65.00per gal

Effective cost

$65.00per gal

Shelf price is what the kit costs per gal. Effective cost spreads the whole purchase over the amount you actually use, so leftover shows up as a higher number.

All options

4 x 0.5 gal$220.00
2 x 1 gal$190.00
1 x 2 gal$170.00

Why the Cheapest Epoxy Is Often the Most Expensive

Comparing epoxy on price per gallon looks sensible and quietly misleads you, because you cannot buy a fraction of a kit. What you spend depends on how the kit sizes divide into what you need, and the answer changes with every project.

  1. 1

    Work out what you need first

    Use the epoxy volume calculator, the river table epoxy calculator or the epoxy coverage calculator to get a real figure, including a waste allowance. Guessing here makes everything downstream wrong, and rounding up at this stage is much cheaper than running out mid pour.

  2. 2

    List the sizes you can actually buy

    Enter the kit sizes your supplier stocks, not theoretical ones. A quart, a gallon and a two gallon kit will usually have three different prices per unit, and the largest is not always available in the resin you want.

  3. 3

    Compare total cost, not unit price

    If you need 1.1 gallons, a one gallon kit means buying two and wasting nearly a full gallon. A two gallon kit at a higher shelf price can easily come out cheaper overall. The calculator does this arithmetic for every option.

  4. 4

    Decide what leftover is worth to you

    Leftover is not always waste. Unopened epoxy keeps for a year or more in a stable, warm place, so if you pour regularly the extra has value. If this is a one off project, treat leftover as money spent and let the total cost decide.

What Drives Epoxy Project Cost

Resin is the biggest line item on most builds, but it is rarely the only one.

Depth, more than area

Cost scales directly with volume, and volume scales with depth. Doubling the depth of a river channel doubles the resin bill, while adding a few inches of table length barely moves it. If a budget is tight, the channel depth is the lever.

Deep pour costs more than coating

Low exotherm casting resins are usually more expensive per unit than table top epoxy, and a river table needs a lot of it. Pricing the deep pour and the coating separately, as the river table epoxy calculator does, gives a far more accurate budget.

Waste and failed pours

A ten percent allowance covers cups and stir sticks. It does not cover a pour that cracks from overheating or cures soft because the ratio was off. Those are the expensive mistakes, and they are why the pour depth and mix ratio warnings matter.

Supplies add up

Mixing cups, stir sticks, gloves, tape, a mixing paddle and pigment are individually cheap and collectively not. Putting a figure in the supplies box keeps the comparison honest, since it applies equally to every kit option.

Epoxy Cost Questions

How much does it cost to make a river table?

The resin is usually the largest cost and depends almost entirely on channel volume. A 60 by 30 inch table with an 8 inch channel at 1.75 inches deep needs roughly 4 gallons of deep pour resin plus coating epoxy, which at typical prices lands in the low hundreds before wood and supplies. Price your own kits above for a real figure.

Is it cheaper to buy epoxy in bulk?

Usually per unit, yes, but only if you use it. A larger kit at a lower unit price still wastes money if half of it cures in the tin. The comparison above accounts for that by pricing whole kits against what your project actually needs.

Does epoxy expire?

It has a shelf life rather than a hard expiry, commonly around a year unopened and stored somewhere warm and dry. Hardener tends to yellow with age before the resin degrades. If you pour often, leftover from a large kit is worth keeping; if not, budget it as spent.

Why is deep pour epoxy more expensive?

It is formulated to cure slowly and release heat gradually, which is a harder chemistry problem than a fast surface coating. You are paying for the ability to pour thick without cracking, and there is no cheaper substitute for a deep channel.

Should I include pigment in the cost?

Yes, in the supplies field. Mica powder and dyes are not expensive per gram, but a large pour at two percent loading uses more than people expect. The epoxy pigment calculator will tell you the dose so you can price it properly.