Free epoxy volume calculator: enter length, width, and depth in inches or cm to see how much resin to pour in ounces, gallons, or liters, with waste and cost.
Void Fill Epoxy Calculator
For small, irregular fills where ounces and milliliters matter: cracks, knots, bark inclusions, and other localized voids.
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
A cavity estimate is not its bounding box
A rectangular 6 × 2.5 × 1 in cavity contains 15 in³ = 245.8 mL. With the example 15% waste and 8% sanding overfill it becomes 302.3 mL. A natural crack can be much smaller than the surrounding rectangular box. For a measured mold or an irregular cavity with known mixed capacity, use the mold calculator. Verify any measuring or leak-test method is compatible with the wood, resin and preparation instructions.
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
- Small-volume planning for cracks, knots, and localized voids.
- Strong emphasis on ounces, liters, and waste buffer.
- Useful when the job is too small for gallon-oriented planning.
- Pairs the raw cavity amount with a sand-back buffer so tiny fills are not under-ordered.
How to measure or set the inputs
- Choose inside geometry for a regular shape, or use a known cavity capacity where that mode is available.
- Set the number of identical pieces; the main quantity is the total batch, with a separate loss allowance.
- Check the raw quantity against a hand calculation or a product's published mixed capacity.
- Enter product ratio, limits and total kit mixed yield only when confirmed; purchase quantity is not a batch-mixing instruction.
Common mistakes that cost money
- Using a gallon-oriented planning mindset on a tiny fill.
- Forgetting to account for resin that will be sanded away.
- Ignoring the irregular profile of bark pockets and cracks.
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
Should I add extra resin if I plan to sand flush later?
Yes. Overfilling and sanding back is common, so your practical usage is usually higher than the cavity-only number.
Related Pages
Related calculators and guides
Convert cubic inches, gallons, liters, quarts, fluid ounces, and milliliters for epoxy planning, kit comparison, and resin quantity checks.
Learn how much extra epoxy to buy for waste, seepage, edge soak-in, mixing loss, and irregular project geometry.
Estimate epoxy project cost from planned resin quantity, waste, and price input for river tables, deep pours, coatings, and other resin projects.
Learn how to measure a river table for epoxy using segment widths, average depth, waste allowance, and practical accuracy tips.
Reviewed · Calculation notes and corrections