Wasted resin is money lost. Limited amount of resin would leave your project half-finished; excessive amount would leave you with sticky residue which could not be used again. It is a matter of saving money, time, and frustration, whether you are sprucing up a piece of counter, casting art objects, or pouring a river table, resin quantities must be calculated correctly.
This guide demonstrates how to find the volumes of resin using simple equations, how to scale a batch and provides you best knowledge so that, you will never guess again.
If you’re unsure about the calculations, our easy-to-use epoxy resin calculator can help you measure the perfect amount every time.
With the right calculations, you can order confidently, scale batches safely, and get the perfect finish.
Epoxy resin volume is usually measured in litres (L) or millilitres (ml). The simplest calculation is:
Volume (ml) = Length (cm) * Width (cm) * Depth (cm)
Because 1 ml = 1 cm³, this formula works directly.
Calculation: 30 * 20 * 0.5 = 300 ml
So you will need about 300 ml total (resin + hardener combined).
Tip: Always add 10% extra to your calculation to allow for resin clinging to cups, sticks, and surfaces.
Most epoxy systems are mixed at:
Check your kit instructions; never assume.
Use a digital scale or graduated cups for accuracy.
Here is where many makers run into problems. Epoxy cures by a chemical reaction that produces heat. Mix too much at once in one cup, and it can:
Shallow pours (thin coatings): Larger mixes are generally safe, as the resin spreads out and dissipates heat.
Deep pours: Mix in smaller batches (500-1000 ml max), pour into the mould, and allow to level. For very large tables, mix multiple batches and pour successively.
Volume = π * radius² * depth
Example: 10 cm diameter, 1 cm depth → 3.14 * 5² * 1 = 78.5 ml
Tip: For irregular shapes, fill the void with rice or water in a measuring container, then transfer to a jug to estimate volume.
By teaching customers to calculate precisely, you reduce waste and increase kit sales:
| Surface Area (m²) | Resin Thickness | Volume Needed |
|---|---|---|
| 0.25 (50×50 cm) | 1 mm | 250 ml |
| 0.5 (100×50 cm) | 2 mm | 1,000 ml (1 L) |
| 1 (100×100 cm) | 3 mm | 3,000 ml (3 L) |
| 2 (200×100 cm) | 5 mm | 10,000 ml (10 L) |
Q: Can I pour leftover resin into another project?
Not if it has already started curing. Once resin warms up in the cup, use it immediately.
Q: How precise do I need to be?
Within 1-2% is usually fine. Too much hardener will not “speed up” curing, it will cause sticky, uncured resin.
Q: How do I avoid bubbles when mixing multiple batches?
Warm the bottles slightly before mixing, stir slowly, and use a heat gun or torch on the surface.
Calculating resin quantities doesn't have to be guesswork. With the formulas above, you can order exactly what you need, reduce waste, and avoid sticky disasters.
Whether you’re making coasters or casting a 3-metre river table, accurate calculations = smoother projects, lower costs, and professional results.
Jenny
This article really helped me understand how to calculate epoxy resin volume for my projects. The tips for measuring and mixing made everything so much easier
Jan 19, 2026