Deep Pour Epoxy Calculator

Deep pours have to be split into layers so the epoxy does not overheat. Enter your mold size, the total depth and the limits from your epoxy label to plan each layer and the full timeline.

1. Your pour
2. From your epoxy label

Pour in

– layers

Each layer–
Layer depth–
Total epoxy–
Last pour starts–
Ready to use–

    Next steps

    River table with an uneven channelAdjust wait times for your room temperatureSplit each layer into resin and hardener

    How to use this calculator

    1. Enter the inside length and width of the mold and the total depth you want to fill.
    2. Copy the maximum pour depth, the time between pours and the full cure time from your epoxy label.
    3. Pour the layers as planned. Mix each layer fresh rather than mixing everything at once.

    How the calculation works

    • Layers = total depth ÷ max depth per pour, rounded up
    • Layer depth = total depth ÷ layers (equal layers are easier to plan)
    • Epoxy per layer = length × width × layer depth, plus waste
    • Ready time = (layers − 1) × hours between pours + full cure time

    Tips for deep pours

    • Seal the mold seams with tape or hot glue and do a test fill with water before pouring epoxy.
    • Keep the room steady at about 70–75 °F (21–24 °C). Too warm and thick layers can overheat.
    • Pour each layer slowly from one corner and let it flow, to avoid trapping air.
    • Lightly sand a layer that has fully hardened before the next pour, unless your label says to pour while tacky.

    Frequently asked questions

    How thick can I pour deep pour epoxy?

    Each product lists its own maximum, often somewhere between 1 and 4 inches per pour. Pouring deeper than the label allows can overheat the resin and cause cracks, bubbles or yellowing, so split thick projects into layers.

    How long should I wait between deep pour layers?

    Follow your label. Many deep pour epoxies are poured again once the previous layer has set firm but is still slightly tacky, often 24 to 72 hours depending on the product and room temperature.

    How much epoxy can I pour at once?

    Limits are about depth and mass. A large batch in a cup heats up faster than the same amount spread out, so mix only what you can pour within the working time, and keep each layer under the maximum depth.

    Do I need deep pour epoxy for a 1 inch pour?

    Usually yes. Table top and art resins are made for thin coats of about 1/8 to 1/4 inch. Anything thicker should use a casting or deep pour epoxy rated for that depth.