Epoxy Resin Calculator

Complete Guide to Calculating Epoxy Resin Pours

Whether you are crafting custom river tables, coating counter tops, filling silicone molds for jewelry, or making decorative tumblers, getting your epoxy resin calculations right is the difference between a glass-smooth finish and a sticky, ruined piece.

Calculating Pour Volumes by Project Shape

1. Rectangular Pours (River Tables, Trays, Boards)

$$\text{Volume } (\text{cm}^3 \text{ or ml}) = \text{Length } (\text{cm}) \times \text{Width } (\text{cm}) \times \text{Depth } (\text{cm})$$ If working in inches: $$\text{Volume } (\text{in}^3) = \text{Length } (\text{in}) \times \text{Width } (\text{in}) \times \text{Depth } (\text{in})$$ Multiply cubic inches by $16.387$ to convert into milliliters ($\text{ml}$), or divide by $1.805$ to convert into fluid ounces ($\text{fl oz}$).

2. Circular Projects (Round Tables, Coasters, Lazy Susans)

$$\text{Volume } (\text{ml}) = \pi \times r^2 \times \text{Depth} \approx 3.1416 \times (\text{Radius})^2 \times \text{Depth}$$

Splitting Part A (Resin) and Part B (Hardener)

Once total volume ($V_{\text{total}}$) is calculated, divide according to your kit’s volumetric ratio:

• 1:1 Ratio Kits (Table top & Art Resin): $$\text{Part A} = \frac{V_{\text{total}}}{2} \quad | \quad \text{Part B} = \frac{V_{\text{total}}}{2}$$
• 2:1 Ratio Kits (Casting & Deep Pour): $$\text{Part A} = V_{\text{total}} \times \frac{2}{3} \quad | \quad \text{Part B} = V_{\text{total}} \times \frac{1}{3}$$
• 3:1 Ratio Kits: $$\text{Part A} = V_{\text{total}} \times \frac{3}{4} \quad | \quad \text{Part B} = V_{\text{total}} \times \frac{1}{4}$$