EEpoxyCalc
Quick calculators
Epoxy casting & mold calculator

Calculate how much epoxy resin your mold needs.

Enter the mold's internal length, width and resin depth to calculate volume, add a waste allowance and compare verified casting epoxy systems by pour limits and available kit sizes.

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Mold / casting calculator

Calculate quantity first. Product matching only uses verified manufacturer data.

Recommended purchase quantity21.78 L5.75 US gal
Calculated volume19.80 L
Waste allowance10%
Resin classDeep-pour / casting epoxy
Pour depth50 mm / 1.97 in
Next step · based on your calculation

Craft Resin Deep Pour Epoxy

Check 1 × 6 gal kit for your estimated 21.78 L requirement.

Verify current price, stock, shipping and suitability on the merchant site. Checking the merchant does not place an order. Some links may earn a commission.
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Verified product matches

What can you actually buy?

Best Match uses technical fit first. Best Value and Lowest Waste are awarded only when the full current kit-price set has been verified.

Manufacturer data only

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1 pour
Max layer for this project51 mm / 2.0 in
Mix ratio2:1 by volume
TemperatureWithin guidance
Suggested purchase planCheck 1 × 6 gal kit →$299.99
Verified-size estimate$299.99
Purchased22.71 L
Left over0.93 L

Price data is older than 30 days or incomplete. This cost is not used for Best Value or Lowest Waste until pricing is refreshed.

Technical source ↗Data last verified 2026-09-13
1 pour
Max layer for this project51 mm / 2.0 in
Mix ratio2:1 by volume
TemperatureWithin guidance
Suggested purchase planCheck 1 × 6 gal kit →$319.95
Verified-size estimate$319.95
Purchased22.71 L
Left over0.93 L

Price data is older than 30 days or incomplete. This cost is not used for Best Value or Lowest Waste until pricing is refreshed.

Technical source ↗Data last verified 2026-09-13
1 pour
Max layer for this project102 mm / 4.0 in
Mix ratio2:1 by volume
TemperatureWithin guidance
Suggested purchase planCheck 1 × 6 gal kit →$319.95
Verified-size estimate$319.95
Purchased22.71 L
Left over0.93 L

Price data is older than 30 days or incomplete. This cost is not used for Best Value or Lowest Waste until pricing is refreshed.

Technical source ↗Data last verified 2026-09-13
Showing the top 3 matches for this project.Browse the full verified product database →

How to calculate epoxy for a mold

For a rectangular mold, resin volume is length × width × depth. EpoxyCalc converts the result into litres and US gallons, then keeps your selected waste allowance separate from the raw geometric volume.

Measure the inside of the mold

Use internal dimensions, not the outside dimensions of the mold box. If the casting contains a large insert or object that displaces resin, subtract that displaced volume when you can measure it reliably.

Deep castings need the right resin

Required volume alone does not determine product suitability. Casting epoxies have different maximum pour depths, working times and temperature guidance. EpoxyCalc compares those manufacturer-published limits separately from the volume calculation.

Allow for practical losses

Mixing containers, tools, small leaks and irregular mold surfaces can all increase real consumption. Use the waste allowance control rather than assuming the geometric result is exactly what you should buy.

For thick rectangular pours outside a mold, use the deep pour epoxy calculator. For live-edge tables, use the river table epoxy calculator.