🧪 Epoxy Resin Calculator
How much resin for your tabletop, mould or river table? Get the volume, the weight and the exact amounts of resin and hardener.
⚠️ Indicative estimate: always follow the manufacturer’s instructions (exact ratio, maximum thickness per pour, working temperature, usually 20 to 25 °C) and wear gloves and safety glasses.
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About the Epoxy Resin Calculator
Running out of resin halfway through a pour is a disaster; buying far too much is expensive. This calculator estimates how much epoxy resin you need for a tabletop, a floor coating, a mould or a river table, then splits it into resin (part A) and hardener (part B) using your product’s mix ratio.
How to Use the Calculator
- Pick the pour type: a coat over a surface, a mould (box or cylinder) or a river table.
- Enter the dimensions in cm or m, and the thickness in mm.
- Deduct any wood or inserts embedded in the resin (in litres), if needed.
- Enter your resin’s ratio (1:1, 2:1, 100:45…), by volume or by weight, as stated on the label.
- Optional: kit size and price to get the number of kits and the budget, then copy the result.
Formulas Used
- Coating: area (m²) × thickness (mm) = volume in litres. Example: 1 m² at 1 mm = 1 L.
- Mould: length × width × height, or π × radius² × height for a cylinder (1,000 cm³ = 1 L).
- River table: length × average river width × slab thickness.
- Weight: volume × density (1.1 kg/L by default, a typical value for mixed epoxy).
- Resin and hardener: for an A:B ratio, resin is A ÷ (A + B) of the total and hardener B ÷ (A + B). With 2:1 by volume and 3 L, that is 2 L of resin and 1 L of hardener.
- Waste margin: 10% by default, for what stays in the cup, on the sticks and what drips off the edges.
Tips
- Respect the ratio basis: a ratio by weight is measured on a scale, a ratio by volume with graduated cups. Never mix the two.
- Deep pours: curing releases heat. A coating resin is poured a few millimetres thick; for a river table, use a deep-pour resin and respect its maximum thickness per pour.
- Temperature: work in a warm room (often 20 to 25 °C), with resin and workpiece at the same temperature.
- Apply a seal coat on wood first to close the pores and reduce bubbles.
Common Mistakes and Limits
- Forgetting edges and leaks: a poorly sealed mould can lose a lot of resin; check it before pouring.
- Overestimated river width: measure it at several points, a river is rarely straight.
- Porous wood: dry wood soaks up some resin; keep the waste margin.
- Estimate only: resin and hardener values shown with ≈ are converted with the mixed density. The manufacturer’s instructions always come first.
Privacy & Security
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- Works offline once the page has loaded.