Epoxy Resin Calculator: How Much Resin Do You Need?
Enter the size of the pour, the extra you want to allow and the mix ratio of your kit. The tool shows the total volume and how much of part A and part B to measure
Your Pour
Optional margin for mix that stays in cups, on stir sticks and in the mold. It starts at 10% only as a placeholder: choose your own.
Mix ratio by volume
Use the ratio printed on your kit, for example 1 and 1, or 2 and 1. Check whether the kit gives it by volume or by weight.
Optional
Use the maximum pour depth in your product instructions. The tool then shows how many layers the depth needs.
Only needed to show weights in grams. Take each density from the product data sheet, not from a guess.
Always follow the mixing ratio, working time, layer depth and safety instructions of your own product. This tool only does the volume math.
Volumes assume the ratio is by volume and that 1 cm³ equals 1 ml. Check the instructions of your product before you mix.
How to use this tool
- Choose the shape, the unit and the size of the pour, or enter a volume you already know.
- Set the extra you want to mix and the A and B parts of your kit’s ratio. Add a density or a maximum layer depth only if you need weights or layers.
- Read the total and the amount of part A and part B to measure, then press Copy Result.
Worked example
A 30 × 20 cm tray poured 0.5 cm deep holds 300.0 ml. With 10% extra the total is 330.0 ml, which is 11.2 US fl oz. At 1 to 1 that is 165.0 ml of part A and 165.0 ml of part B. At 2 to 1 it would be 220.0 ml of part A and 110.0 ml of part B.
Methodology
The volume of a pour is its area times its depth. A rectangle uses length × width × depth, a circle uses π × (diameter ÷ 2)² × depth, and you can type a volume directly for an irregular mold. Everything is converted to milliliters, because 1 cubic centimeter is exactly 1 milliliter. The tool then multiplies by the number of pieces, adds your extra percentage and splits the total into part A and part B by the ratio you enter. Nothing is uploaded or stored.
Volume of common pours
The same formula applied to a few typical pieces, with 10% extra mix added.
| Piece | Volume (ml) | With 10% extra (ml) | With 10% extra (US fl oz) |
|---|---|---|---|
| Round coaster, 10 cm across, 0.5 cm deep | 39.3 | 43.2 | 1.5 |
| Tray, 30 × 20 cm, 0.5 cm deep | 300.0 | 330.0 | 11.2 |
| Board coating, 40 × 30 cm, 0.3 cm deep | 360.0 | 396.0 | 13.4 |
| Table top coating, 120 × 60 cm, 0.3 cm deep | 2,160.0 | 2,376.0 | 80.3 |
These sizes only illustrate the formula. The depth you pour depends on your project and your product’s instructions, so enter your own numbers above.
Gear for Measuring and Mixing
A resin kit, measuring cups and disposable gloves for the workbench
Epoxy Resin Kit 16oz, Bubble Free Crystal Clear Resin, Anti-Yellowing Self Leveling Easy Mix 1:1
Epoxy resin kit of 16 oz with an easy-mix 1:1 ratio, listed as crystal clear, bubble free, anti-yellowing and self leveling, for coating and casting. Always follow the instructions that come with your kit.
Palksky Silicone Cups, 4PCS Silicone Measuring Cups with 250 & 350ml Capacity, Reusable
Set of four reusable silicone measuring cups with 250 and 350 ml capacities, as listed. The listing is for melting chocolate and baking, so check that a cup suits the product you plan to mix before using it.
Medical Soft Max Nitrile Exam Gloves, Powder-Free, Disposable, 100 Count, Blue
Box of 100 powder-free, latex-free disposable nitrile exam gloves in blue, as listed. The listing mentions examination, cooking, cleaning and food prep, so check what protection your resin’s instructions ask for.
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Frequently asked questions
How do I calculate how much epoxy resin I need? ▼
Multiply the length, the width and the depth of the pour to get its volume, and read the result in milliliters (1 cm³ is 1 ml). Add a margin for the mix that stays in the cup and on the stir stick, then split the total into part A and part B by your kit’s ratio. The calculator does all of this and also handles round pieces.
How much extra resin should I mix? ▼
It depends on your mold, your cups and how careful you are. The calculator starts at 10% only as a placeholder, so change it to the margin that suits you. A mold with an irregular shape is best measured by filling it with water first.
Is the ratio by volume or by weight? ▼
The ratio in this tool is by volume. Some kits give it by weight, and because the two parts can have different densities, a weight ratio is not the same as a volume ratio. Follow your product’s instructions and, if it says weight, measure with a scale.
What is the maximum depth I can pour at once? ▼
It depends on the product, so the tool does not assume one. Enter the maximum pour depth from your product’s instructions, and the tool shows how many layers your depth needs and roughly how much to mix for each.
Is my data uploaded anywhere? ▼
No. The calculation runs in your browser, so the numbers you type stay on your device and nothing is saved. If you reload or close the page, the fields return to their defaults.