Epoxy Resin Calculator

This calculator turns a mould, a river table channel or a poured table top into the amount of epoxy it will drink, then splits that amount into resin and hardener. Enter the dimensions and the pour depth in inches or millimetres, add a waste allowance, and set the mix ratio along with whether it is quoted by volume or by weight. It returns the total mixed volume and weight, each component in millilitres, fluid ounces, grams and pounds, the same ratio converted to the other measuring basis, and the coverage per gallon for a flood coat. Because a mix ratio by volume is not the same number by weight, the component densities are editable so you can match your own data sheet. The result also flags when the depth you entered is past what a coating epoxy can cure without overheating.

Calculator Type
Units You Are Entering

A rectangular or round cavity filled to a depth. A river table channel is the rectangular case: enter the length of the river, the width of the gap and how deep it runs.

For a round mould this is ignored; the diameter below is used instead.
How deep the epoxy sits, not how tall the mould is.
Epoxy left clinging to the mixing cup and the stick, plus the bit you would rather have over than run short of. Ten percent is normal, more for a small pour where the cup holds a larger share.
For a 2:1 epoxy enter 2 here and 1 below. For 100:45 enter 100 and 45.
From the technical data sheet, in g/cm3, which is the only unit a resin data sheet prints, so there is nothing to choose here whichever units you are measuring the mould in. Casting and coating resins usually sit between 1.05 and 1.20.
From the same data sheet and in the same g/cm3. Amine hardeners are usually a little lighter than the resin, around 0.94 to 1.00.
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Units You Are Entering

A flat surface poured to a thickness, one or more coats. The coverage line is the one to check against the back of the tin.

A flood coat is normally about 1/8 inch, which is 0.125 in or 3.2 mm.
Epoxy left clinging to the mixing cup and the stick, plus the bit you would rather have over than run short of. Ten percent is normal, more for a small pour where the cup holds a larger share.
For a 2:1 epoxy enter 2 here and 1 below. For 100:45 enter 100 and 45.
From the technical data sheet, in g/cm3, which is the only unit a resin data sheet prints, so there is nothing to choose here whichever units you are measuring the mould in. Casting and coating resins usually sit between 1.05 and 1.20.
From the same data sheet and in the same g/cm3. Amine hardeners are usually a little lighter than the resin, around 0.94 to 1.00.
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Measured In

You already know how much you need, or how much resin you have left. Enter the amount and which part it is, and the rest follows from the ratio.

For a 2:1 epoxy enter 2 here and 1 below. For 100:45 enter 100 and 45.
From the technical data sheet, in g/cm3, which is the only unit a resin data sheet prints, so there is nothing to choose here whichever units you are measuring the mould in. Casting and coating resins usually sit between 1.05 and 1.20.
From the same data sheet and in the same g/cm3. Amine hardeners are usually a little lighter than the resin, around 0.94 to 1.00.
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