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