River Table Epoxy Volume & Pigment Calculator
Exact resin + hardener + pigment for your river table — average multiple width measurements, account for seal coats, mixing loss and layer limits, and never run short mid-pour.
- No brand ties — the math works for any manufacturer's kit at any ratio.
- No account, no sign-up
- Inputs stay in this tab
Mold dimensions
What to buy
The math behind it
Volume uses the average of your width samples × length × depth, converted at 231 in³ per gallon. Seal coats wet the channel side walls (live edge): length × depth per side × 2 sides at ~1/32 in per coat. Mixing loss covers cups, sticks and the unmixed film every pour leaves behind — 10% is the standard planning allowance. The mix ratio splits the total into resin and hardener parts by volume; pigment is a percentage of the total mixed volume and is NOT counted toward the resin:hardener ratio.
Running out mid-pour is the #1 river-table failure: it leaves a visible cold joint. When in doubt round up to the next kit size — unopened kits store for a year, cold joints don't.
What people hate about the other tools
We read the reviews of the incumbents before writing this page. Every complaint below maps to a decision in the tool above.
Ran out of epoxy halfway through the pour — the cold joint is visible the length of the table
In this toolAveraged volume + 10% mixing loss + kit rounding so the pour finishes in one session.
One-line difference: Multi-point width averaging for tapering slabs, seal-coat volume, mixing loss and the 2-inch layer limit that prevents exotherm cracks — the four things single-box calculators miss.
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Free no signup, no card
- Volume from up to 4 width samples along a tapering channel
- Resin/hardener split for 1:1, 2:1, 3:1 and 100:45 kits
- Layer plan for deep pours and pigment by % of total mix
Why there is no paywall deliberate
This tool never touches a server, so it costs almost nothing to run. Ads are labelled, never interstitial, and never placed between you and a result.
Pricing benchmarked against what the incumbents charge. See the full monetization map →
The tool runs locally in your browser — nothing you type is uploaded. The ad slot on this page is served by Google. See all 27 tools · Privacy · How these are paid for