Epoxy Resin Calculator
Calculate how much epoxy resin to buy for a river table, countertop, floor or mould, with part A and B amounts.
About the Epoxy Resin Calculator
Resin volume is length × width × depth of the space it fills; 1 litre fills 1,000 cm³ (61 in³). Add 5–10% for spills, the tray and seal coats. Most coating epoxies mix 1:1 by volume and deep-pour casting resins often 2:1 or 3:1; always follow the manufacturer's ratio and maximum pour depth, as thick pours can overheat.
The formula
Volume = L × W × D × fill %; part A = V × r ÷ (r + 1)
Worked example
Example: Mixed resin needed = 18.68 L (4.93 US gal)
- Inputs: Units: Feet / inches; Length: 79; Width: 13; Depth: 1; Share of the area filled with resin: 100%; Mix ratio (resin : hardener): 1 : 1; Extra: 11%.
- Formula: Volume = L × W × D × fill %; part A = V × r ÷ (r + 1)
- Result: Mixed resin needed = 18.68 L (4.93 US gal)
Questions people ask
How much for a seal coat?
About 1 L per 1–1.5 m² for a thin coat, depending on the product.
Measure by volume or weight?
Whichever the label states; ratios by volume and by weight differ.