Epoxy Resin Calculator (How Much Resin for a Pour)
Millilitres of mixed epoxy, split into resin and hardener, for a table, tray, coaster or mould of a given size and depth, with a margin for waste.
Results
Total mixed resin to prepare
792
mL
Resin (part A)
396
mL
Hardener (part B)
396
mL
Weight of the mixed resin
871
g
The dashed line marks the value you entered.
What this tool does
The amount is simply area times depth: a 60 × 40 cm board poured 3 mm deep needs 720 mL, since one millilitre fills one square centimetre ten millimetres deep. Then comes the mix ratio, which for most coating and casting resins is given by volume, often 1:1 or 2:1; a few are specified by weight, so read the data sheet. Add 5 to 15 % for what stays in the cup and runs off the edges, and pour deep casts in layers to limit the heat the reaction gives off.
Formula
V = area × depth · total = V × (1 + extra) · A = total × a ÷ (a + b) · mass = total × density
Variables
| Symbol | Meaning | Unit |
|---|---|---|
sp | Shape of the pour | — |
l | Length (or diameter if round) | cm |
w | Width (ignored if round) | cm |
dp | Depth of the pour | mm |
ra | Mix ratio: parts of resin | — |
rb | Mix ratio: parts of hardener | — |
de | Density of the mixed resin | g/mL |
ex | Extra for spills and the cup | % |
V | Total mixed resin to prepare | mL |
A | Resin (part A) | mL |
B | Hardener (part B) | mL |
M | Weight of the mixed resin | g |
Worked example
- Shape of the pour1
- Length (or diameter if round)60 cm
- Width (ignored if round)40 cm
- Depth of the pour3 mm
- Mix ratio: parts of resin1
- Mix ratio: parts of hardener1
- Density of the mixed resin1.1 g/mL
- Extra for spills and the cup10 %
- Total mixed resin to prepare792 mL
- Resin (part A)396 mL
- Hardener (part B)396 mL
- Weight of the mixed resin871 g
Limitations
- Always order a little more material than the calculated quantity. Cuts, breakage and pattern matching create waste that depends on the shape of the job.
- Density changes with temperature, moisture and composition. Use a value from the supplier's data sheet whenever precision matters.