Enter total depth and your resin's max layer depth to plan the number of pours.
Epoxy Volume Calculator
Estimate the mixed resin volume from inside dimensions, add allowances and plan whole kits. Enter your product's ratio and limits when known.
Enter your measurements
Example inputs
Default dimensions, allowances and prices are example inputs. Replace them with your measurements and product label. Leave unknown product limits blank.
Recommended order
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Start with the inputs to generate an order-ready estimate.
- Raw volume
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- Conservative
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- Projected cost
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- Part A / Part B
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- Layer guidance
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- Kits to buy
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- Standard
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- Product fit
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Why This Estimate Changed
What moved the number
- Enter the form values to see raw volume, buffer, and recommendation.
Next Step
Match the result to the right resin class
Use the estimate to narrow the resin class first. Then confirm product limits, cure behavior, and measurement assumptions before you make a buying decision.
Measurement diagram
How much epoxy do I need?
Multiply length × width × depth in inches, then divide by 231 for gallons or by 1.805 for fluid ounces. A 2 × 4 ft tabletop at 1/8 in needs about 0.62 gal (2.4 L); a 6 ft river channel 6 in wide and 1.5 in deep needs about 2.81 gal (10.6 L). The calculator adds 8% for waste by default.
| Project | Size | Resin needed | With 8% waste |
|---|---|---|---|
| Round coaster | 4 in diameter × 1/4 in | 1.7 fl oz (51 ml) | 1.9 fl oz (56 ml) |
| Serving tray | 12 × 18 in × 1/8 in | 15 fl oz (442 ml) | 16.2 fl oz (478 ml) |
| Tabletop flood coat | 2 × 4 ft × 1/8 in | 0.62 gal (2.4 L) | 0.67 gal (2.5 L) |
| Bar top flood coat | 2 × 8 ft × 1/8 in | 1.25 gal (4.7 L) | 1.35 gal (5.1 L) |
| River table channel | 6 ft × 6 in wide × 1.5 in deep | 2.81 gal (10.6 L) | 3.03 gal (11.5 L) |
| Slab or cavity fill | 48 × 18 in × 1.25 in | 4.68 gal (17.7 L) | 5.05 gal (19.1 L) |
Mixed resin (Part A + Part B together). Flood coats are the top surface only; add the edges if they get coated.
Worked example: a 48 × 18 in slab poured 1.25 in deep
- Volume: 48 × 18 × 1.25 = 1,080 cubic inches.
- Gallons: 1,080 ÷ 231 = 4.68 gal (17.7 L) of mixed resin.
- Waste: × 1.08 = 5.05 gal to order.
- Mix split: at 2:1 that is 3.37 gal of Part A and 1.68 gal of Part B; at 1:1, half of each.
- Depth check: 1.25 in is far beyond a tabletop epoxy's 1/8 – 1/4 in per coat, so this job needs a deep-pour or casting resin, poured in as many layers as its data sheet requires.
How deep can you pour epoxy in one layer?
The limit comes from heat: thicker pours cure hotter. Use the number on your product's data sheet; these are typical published limits.
| Resin type | Typical max per pour | Published examples |
|---|---|---|
| Tabletop / bar top (flood coat) | 1/8 in, some up to 1/4 in | TotalBoat TableTop: 1/8 – 1/4 in per coat; Primaloc Bar & Table Top: 1/8 in layers |
| Deep pour / casting | 1/2 – 1 in | MAS Deep Pour: 1/2 in for slabs and river tables, up to 1 in in small molds |
| Extra-slow deep pour | 2 – 3 in | MAS Deep Pour X: 2 – 3 in per pour |
Large pours run hotter than small ones, so a big river table may need thinner layers than a small mold of the same depth.
- TotalBoat TableTop Epoxy technical data sheet
- Primaloc: maximum thickness for a single layer
- MAS Epoxies: Deep Pour
- MAS Epoxies: Deep Pour X
Rectangle measurements and a checkable order
Measure the finished inside length L, width W and filled depth d. A 48 × 18 × 1.25 in cavity is 1,080 in³, or 4.6753 US gal. An 8% allowance gives 5.0494 gal. Switching to metric converts the same geometry to 121.92 × 45.72 × 3.175 cm; it does not change the physical quantity. Part A/B and lift limits stay unconfirmed until you enter the exact product information.
Product data before mixing
Use the exact product documentation for mixing basis, maximum layer depth, mixed batch volume and cure or recoat conditions. A dimensional estimate and a purchase allowance do not supply those material limits.
What this calculator covers
- Rectangles and circles, measured in inches or centimeters.
- Mixed resin in fluid ounces, gallons, and liters, plus the Part A / Part B split.
- A waste buffer and cost per gallon, so the order is not just raw geometry.
- Layer guidance when the depth is too much for a single pour.
How to measure or set the inputs
- Pick rectangle or round to match the area you are filling or coating.
- Enter finished inside dimensions, not the rough board size or the outside of the mold.
- Use round mode for circular tables, trays, and molds.
- Switch the unit toggle before entering values if your notes are in metric.
- Raise the waste buffer for porous wood, many edges, runoff, or uncertain measurements.
Common mistakes that cost money
- Using the general calculator for river tables or garage floors, which have their own seepage and coverage rules.
- Ordering the raw volume with no allowance for cup loss, edges, and soak-in.
- Pouring a tabletop epoxy deeper than its 1/8 – 1/4 in per-coat limit.
Project checklist before you buy
- Confirm the mold or surface is sealed before mixing resin.
- Measure depth twice at the deepest point of the project.
- Add extra material for waste, seepage, and edge soak-in.
- Confirm the resin type matches the intended pour depth.
- Prepare cups, stir sticks, gloves, and a level work surface.
FAQ
Questions people ask before buying epoxy
How many ounces of epoxy do I need per square foot?
At the common 1/8 in flood-coat thickness, about 10 fl oz per square foot (one gallon covers about 12.8 sq ft). At 1/16 in it is about 5 fl oz per square foot. Add the edges and 5–10% for waste.
How do I split resin and hardener?
Divide the total by the ratio on your product. At 1:1, half is Part A and half is Part B. At 2:1, two thirds is Part A and one third is Part B. Check whether the ratio is by volume or by weight; weight ratios need a scale.
When should I use a different calculator?
Use the river table calculator for live-edge channels with seepage, the coverage calculator for thin coats measured in square feet, and the floor cost calculator for garage and basement floors.
Why does the calculator show more resin than the raw math?
Because some resin always stays in cups, on edges, and in the wood. The recommendation adds a waste buffer so you do not run short mid-pour.
Related Pages
Related calculators and guides
Learn how to calculate epoxy needs by volume, coverage, thickness, and waste, then use the right calculator for your project.
Estimate epoxy for river tables with quick mode, segment mode, seepage, seal-coat buffer, cost planning, and deep-pour recommendations.
Enter square feet (or m²) and coat thickness to see how many gallons of epoxy you need, with edge runoff, waste, and cost for tabletops, bar tops, and countertops.
Calculate deep pour epoxy volume, staged lift count, waste, and cost for thick casting projects and resin pours that cannot be treated like a surface coat.
How to split epoxy resin and hardener at 1:1, 2:1, and 3:1 in ounces and milliliters, when to measure by weight, and what happens if the ratio is off.
Convert cubic inches, gallons, liters, quarts, fluid ounces, and milliliters for epoxy planning, kit comparison, and resin quantity checks.
Reviewed · Calculation notes and corrections