Epoxy Resin Calculator
Calculate the exact amounts of resin (Part A) and hardener (Part B) needed for river tables, art projects, coasters, and deep-pour castings without waste or shortages.
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Formula
Volume = Length × Width × Depth | Total Weight = Volume (ml) × 1.1 g/ml (Epoxy Density) Esempio pratico
A rectangular river table measuring 60 cm × 30 cm with a depth of 2.5 cm requires 4,500 ml (approx. 4.95 kg) of mixed epoxy. With a 2:1 ratio by volume, you need 3,000 ml of Part A (Resin) and 1,500 ml of Part B (Hardener).
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: $$\text{Part A} = V_{\text{total}} \times \frac{3}{4} \quad | \quad \text{Part B} = V_{\text{total}} \times \frac{1}{4}$$
Domande frequenti
What is the typical density of uncured epoxy resin?
Standard uncured epoxy resin systems have an average density of approximately 1.10 g/ml to 1.15 g/ml. This means 1,000 ml (1 liter) of mixed liquid resin weighs approximately 1,100 grams (1.1 kg or 38.8 oz).
What is the difference between mixing by volume versus mixing by weight?
Many resin brands formulate Part A and Part B with different liquid densities. A kit labeled '2:1 by volume' might actually require '100:45 by weight' on a digital scale. Always check the manufacturer's technical data sheet (TDS) before mixing on a scale.
How much extra resin should I mix to account for cup cling and waste?
It is standard practice among resin crafters and woodworkers to add 5% to 10% extra to your calculated total to account for residue left on mixing stick containers, leveling overflow, and surface tension meniscus.
What happens if the ratio of Part A to Part B is incorrect?
An incorrect mix ratio prevents complete polymer cross-linking, causing sticky surfaces, soft curing, cloudiness, or excessive exothermic heat buildup (thermal runaway) in deep castings.