Epoxy Calculator
How much epoxy do I need? This free epoxy resin calculator answers it from your project dimensions — an epoxy volume calculator for table tops, river tables, molds, and castings. It also works as an epoxy mix ratio calculator (how much hardener for epoxy resin at 1:1, 2:1, 3:1, 4:1), a deep pour epoxy pour planner, and an epoxy cost estimator. Volume math uses the industry formula: cubic inches ÷ 231 = gallons, matching manufacturer data from TotalBoat, WiseBond, and Stone Coat.
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Epoxy Volume Calculator
Enter your project size in inches. Wondering how much epoxy resin do i need for a flood coat? A table top epoxy calculator example: a 36×24 in top at 1/8 in thick needs about half a gallon. Use the river option as a river table epoxy calculator — measure the channel at several points and use the average width.
River channel: use the average channel width (measure at several points). This is a planning estimate for irregular live edges.
Epoxy resin coverage per gallon (computed from 231 in³/gal)
| Pour depth | Coverage per gallon | Manufacturer anchor |
|---|---|---|
| 1/16 in | 25.7 sq ft | TotalBoat High Performance: 25.6 |
| 1/8 in | 12.8 sq ft | TotalBoat Table Top: 12.8; WiseBond flood coat: 12 |
| 1/4 in | 6.4 sq ft | TotalBoat: 6.4; FGCI: 6 |
| 1/2 in | 3.2 sq ft | TotalBoat ThickSet: 3.2 |
| 1 in | 1.6 sq ft | computed (no label claim) |
| 2 in | 0.8 sq ft | computed (no label claim) |
This epoxy coverage calculator table is pure volume math — it reproduces every anchored manufacturer row within 0.1 sq ft. Full sources in the FAQ.
Epoxy Mix Ratio Calculator
How much hardener for epoxy resin? Pick your label's ratio and the total mixed volume. This epoxy resin mix ratio chart solver splits it into resin (Part A) and hardener (Part B) by volume.
Deep Pour Epoxy Planner — How Many Pours?
How thick can i pour epoxy? It depends on the formula. Pick your epoxy class for its max pour depth per layer (guidance from manufacturer labels), and this deep pour epoxy calculator plans the layers. How deep can you pour epoxy resin in one go? Tabletop epoxy: 1/8 in. Deep pour for river tables: up to 2 in.
Epoxy Cost Estimator
How much does epoxy cost per gallon? Tabletop kits run roughly $60–$90/gal and deep pour kits $90–$130/gal in 2026 retail (estimate). Enter your price for a project total.
Epoxy Calculator FAQs
How much epoxy do I need for a table top?
For a 36×24 in table top with a 1/8 in flood coat, the volume is 36 × 24 × 0.125 = 108 cubic inches. Divide by 231 (cubic inches per gallon): 108 ÷ 231 ≈ 0.47 gallons, and with the standard 10% waste factor this epoxy calculator plans 0.51 gallons (65.8 fl oz / 1.95 L) — buy 1 gallon. That is the whole “how much epoxy for a table top” answer: area × depth ÷ 231 × 1.10. The same math works as a countertop epoxy calculator at any size.
How much epoxy for a river table?
Measure the river channel (not the wood): length × average channel width × depth. Example: a 60 in long channel, 8 in average width, 1.5 in deep = 60 × 8 × 1.5 = 720 cubic inches. 720 ÷ 231 ≈ 3.12 gallons, and with 10% waste this river table epoxy calculator estimates 3.43 gallons (438.9 fl oz, 12.98 L) — buy 4 gallons. So “how much resin for a river table” this size is about 3.43 gallons mixed, poured in a single layer since 1.5 in is under the 2 in deep-pour limit.
How do I convert cubic inches to gallons of epoxy?
The industry formula (TotalBoat publishes the same): volume in cubic inches ÷ 231 = gallons. In fluid ounces: ÷ 1.805 = fl oz, then ÷ 128 = gallons. Example: a 24×12×2 in mold holds 24 × 12 × 2 = 576 cubic inches → 576 ÷ 231 ≈ 2.49 gallons (319.2 fl oz — TotalBoat’s fl-oz path gives 576 ÷ 1.805 ≈ 319.1 fl oz, the same answer). Use the Volume tab as an epoxy mold calculator and it does both conversions.
Epoxy mix ratio calculator: how much hardener do I mix in?
Read your label first — ratio is by volume unless stated otherwise. This epoxy resin mix ratio chart solver splits any total: for a 2:1 epoxy mix ratio with 1.5 gallons total, resin = 1.5 × 2/3 = 1.0 gal (128.0 fl oz) and hardener = 1.5 × 1/3 = 0.5 gal (64.0 fl oz). Common label ratios: 1:1 (Stone Coat, TotalBoat Table Top/ThickSet/Artist, WiseBond table top) and 2:1 (WiseBond Deep Pour, TotalBoat Fathom). That answers “how much hardener for epoxy resin” for any ratio — 3:1 and 4:1 work the same way.
How thick can I pour epoxy in one layer?
Follow your product’s label — max pour depth is a heat-management limit, not a suggestion. Label guidance behind this deep pour epoxy calculator: tabletop/flood-coat epoxy max 1/8 in per layer (Stone Coat technical doc; TotalBoat Table Top 1/8–1/4 in), art/craft casting epoxy max 1/4 in (TotalBoat Artist; Stone Coat Quick Coat), deep pour epoxy up to 2 in per layer for river tables (WiseBond Deep Pour; TotalBoat Fathom). So “how thick can i pour epoxy” = check which class you bought, then plan layers in the Pour Planner tab.
How many square feet does a gallon of epoxy cover?
It depends on pour depth — one gallon is 231 cubic inches, so coverage = 231 ÷ depth ÷ 144. This epoxy coverage calculator gives: 25.7 sq ft at 1/16 in, 12.8 sq ft at 1/8 in, 6.4 sq ft at 1/4 in, 3.2 sq ft at 1/2 in, 1.6 sq ft at 1 in, 0.8 sq ft at 2 in. Those rows reproduce manufacturer labels within 0.1 sq ft (TotalBoat: 12.8/25.6/6.4/3.2; WiseBond flood coat: 12; FGCI: 12/6/24). So “epoxy resin coverage per gallon” at the standard 1/8 in flood coat is about 12–13 sq ft.
How much epoxy do I need for a 12-inch round mold?
Cylinder volume: π × r² × depth. A 12 in diameter mold (r = 6) at 2 in deep holds π × 36 × 2 ≈ 226.2 cubic inches → 226.2 ÷ 231 ≈ 0.98 gallons, and with 10% waste this epoxy mold calculator plans 1.08 gallons (137.9 fl oz / 4.08 L) — buy 2 gallons. So “how much epoxy for a mold” this size is just over a gallon; deep-pour it in one 2 in layer or split per your label’s max.
Epoxy seal coat vs flood coat: how much for each?
They are different coats with different coverage. WiseBond’s manufacturer calculator plans 12 sq ft per gallon for a flood coat at 1/8 in thick, but 36 sq ft per gallon for a thin brushed seal coat. The seal coat is a thin brush-on layer that seals wood pores and stops bubbles in the flood coat — it is not a pour, so volume math does not apply to it directly. Budget them separately: seal coat first (thin), then the flood coat from the Volume tab. A 1/16 in thin pour covers about 25.7 sq ft/gal by volume math — between the two.
How much does epoxy cost per gallon?
In 2026 retail, tabletop kits run roughly $60–$90/gal and deep pour kits $90–$130/gal (estimate — prices move). Example: the 3.43-gallon river table above at $89.99/gal ≈ $308.67 in resin alone (this epoxy cost estimator: 3.43 × 89.99). Pigments, molds, and seal-coat epoxy are extra. Enter your local price in the Cost tab for your number.
How many pours for a river table 3 inches deep?
Divide total depth by your epoxy’s max pour depth per layer. A 3 in deep channel with deep-pour epoxy (2 in/layer max): ceil(3 ÷ 2) = 2 pours. Example: 60 × 8 × 3 in = 1,440 cubic inches → with 10% waste 6.86 gallons total (877.7 fl oz), so 3.43 gallons per layer (439.0 fl oz). That is how “how many pours for a river table” is answered — depth first, then split the volume evenly. Let each layer reach a firm tack before the next.
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