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Deep Pour Epoxy Calculator
Plan thick castings and river pours. Enter the total depth and the maximum depth your epoxy allows per pour; the calculator shows total volume, number of layers and the amount to mix for each layer.
Formula
V (in³) = length × width × depth (or π × r² × depth)
Layers = ceil(total depth ÷ max depth per layer)
Per-layer volume = V_total ÷ layersWhy maximum pour depth matters
Epoxy cures through an exothermic reaction — it generates heat. In a thick mass that heat can't escape fast enough, which can speed up the reaction further. Exceeding a product's rated depth can lead to cracking, yellowing, warping, smoke or a soft cure. Deep pour formulations are designed to cure slowly to limit this, but every product has its own limit, so always use the number on your label or technical data sheet, and consider room temperature (warmer rooms generally mean faster, hotter cures).
Timing between layers
Manufacturers usually give a recoat window. Pouring the next layer within it typically gives a chemical bond; waiting longer may require sanding the surface first. This calculator splits the depth evenly; you can also pour thinner layers than the maximum.
Unit conversions used
- 1 US gallon = 231 in³ = 128 US fl oz
- 1 US fl oz = 1.8047 in³ = 29.5735 ml
- 1 in³ = 16.387 ml; 1 ft³ = 1,728 in³ ≈ 7.48 gal
- Weight = volume (cm³) × density. Many mixed epoxies are roughly 1.05–1.2 g/cm³; the default 1.1 is an approximation — check your product's technical data sheet and edit the field.
Frequently asked questions
How many layers do I need for a deep pour?
Divide your total depth by the maximum pour depth on your product label and round up. A 4 inch pour with a 2 inch per-layer limit needs 2 layers.
What happens if I pour epoxy too thick?
Excess heat can build up during curing, which may cause cracks, bubbles, yellowing, warping or an incomplete cure. Stay within the manufacturer's maximum depth.
How long should I wait between deep pour layers?
Follow the recoat window on your product data sheet. Deep pour epoxies are slow curing, and the window can vary widely between products and temperatures.
Does this calculator work in centimeters?
Yes. Choose centimeters for dimensions, and set the max depth per layer unit separately to inches or cm.