Epoxy Volume Calculator
Compare what a mould or cavity holds against the pour you are planning, and see the shortfall or the surplus before you mix.
At a glance
- What you enter
- Mould shape, Mould length, Mould width, Mould diameter, Mould depth, Height of the cylinder, Depth you plan to fill to, Volume you plan to mix, Resin density
- What you get
- Mould capacity, Mould capacity by weight, Shortfall against the fill line, Surplus above the fill line, Pour as a share of capacity, Pour fills the whole mould
- Formula shown
- Yes, every step, right below your results.
- Cost and privacy
- Free, no account needed, and nothing you type is stored.
See worked examples ↓ Read the FAQ ↓ Share this calculator ↓
Results are estimates for general information only, always verify with a professional or official source before acting on them.
How to use the Epoxy Volume Calculator
- 1 Enter Mould shape
- 2 Enter Mould length (cm), Rectangular moulds only.
- 3 Enter Mould width (cm), Rectangular moulds only.
- 4 Enter Mould diameter (cm), Circular and cylindrical moulds.
- 5 Enter Mould depth (mm)
- 6 Enter Height of the cylinder (cm), Cylindrical moulds only.
- 7 Enter Depth you plan to fill to (mm), Usually a little less than the mould depth, or the depth of one layer.
- 8 Enter Volume you plan to mix (ml)
- 9 Enter Resin density (g/ml), About 1.05 to 1.2 grams per millilitre for most epoxy products.
- 10 Press Calculate. You get Mould capacity, Mould capacity by weight, Shortfall against the fill line, Surplus above the fill line, Pour as a share of capacity, Pour fills the whole mould, and every intermediate step stays visible under "How is this calculated?"
- 11 Change one number at a time to see what moves the result, that is usually the most useful thing a calculator can tell you.
Worked examples
Real numbers run through this calculator. Open any example to load it into the form above and change it.
Square mould with a little to spare
A 12 cm by 12 cm mould, 30 mm deep, filled to 20 mm, with 300 ml mixed.
You enter
- Mould shape
- 1
- Mould length
- 12 cm
- Mould width
- 12 cm
- Mould diameter
- 12 cm
- Mould depth
- 30 mm
- Height of the cylinder
- 12 cm
- Depth you plan to fill to
- 20 mm
- Volume you plan to mix
- 300 ml
- Resin density
- 1.10 g/ml
You get
- Mould capacity
- 432.00 ml
- Mould capacity by weight
- 475.20 g
- Shortfall against the fill line
- 0.00 ml
- Surplus above the fill line
- 12.00 ml
- Pour as a share of capacity
- 69.44 %
- Pour fills the whole mould
- 0
The mould holds 432 millilitres, the fill line takes 288, so 300 millilitres covers it with 12 to spare.
Round mould that falls short
A 12 cm round mould filled to 20 mm, with only 200 ml mixed.
You enter
- Mould shape
- 2
- Mould length
- 12 cm
- Mould width
- 12 cm
- Mould diameter
- 12 cm
- Mould depth
- 30 mm
- Height of the cylinder
- 12 cm
- Depth you plan to fill to
- 20 mm
- Volume you plan to mix
- 200 ml
- Resin density
- 1.10 g/ml
You get
- Mould capacity
- 339.29 ml
- Mould capacity by weight
- 373.22 g
- Shortfall against the fill line
- 26.19 ml
- Surplus above the fill line
- 0.00 ml
- Pour as a share of capacity
- 58.95 %
- Pour fills the whole mould
- 0
The fill line takes about 226 millilitres, so 200 millilitres is about 26 short. Mix a little more before you start pouring.
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Frequently asked questions
How do I know if I have mixed enough resin?
Should I fill a mould right to the top?
Does resin shrink when it cures?
How many layers should a deep pour be split into?
Terms used here
Short, plain-language definitions of the words this calculator uses.