How Much Resin Do I Need? Easy Calculator and Chart
October 20264 min read
October 2026Share
Mix too little and you run out halfway through a pour. Mix too much and expensive resin cures in the cup. The fix is a two-minute calculation. Below is the simple formula, a ready-made chart for common Indian resin projects, and how to split the total into Part A and Part B.
Prefer not to do the maths? Use our free resin calculator — pick your project, enter the size and it tells you exactly how much to mix and which kit covers it.
The simple formula
- Measure in centimetres: length × width × depth (thickness). For round pieces use 3.14 × radius × radius × depth.
- That answer is millilitres (ml) of resin, because 1 cubic centimetre = 1 ml.
- Multiply by 1.1 to convert to grams — mixed epoxy weighs a little more than water.
- Add 10–15% extra for what sticks to the cup and the sides of the mould.
💡 Pro tip: Measure depth carefully — it changes the answer the most. A coat that's 6 mm thick needs double the resin of a 3 mm coat.
Worked example: a 30 × 20 cm tray, 3 mm coat
30 × 20 × 0.3 = 180 ml → 180 × 1.1 = 198 g → plus 10% ≈ 220 g of mixed resin.
Resin quantity chart for common projects
Approximate mixed resin needed, including a little extra. Sizes vary, so treat this as a starting point.
| Project | Typical size | Mixed resin | Best resin |
|---|---|---|---|
| Coaster (each) | 10 cm round, 3 mm | About 30 g | Vitro 2:1 |
| Set of 4 coasters | 10 cm round, 3 mm | About 115 g | Vitro 2:1 |
| Keychains (5–6 pieces) | Small moulds | About 30–50 g | Vitro 2:1 |
| Nameplate | 30 × 15 cm, 3 mm | About 165 g | Vitro 2:1 |
| Serving tray | 30 × 20 cm, 3 mm | About 220 g | Vitro 2:1 |
| Wall clock | 30 cm round, 3 mm | About 255 g | Vitro 2:1 |
| Flower block | 8 × 8 × 5 cm | About 385 g | Flex 3:1 |
| Varmala block | 15 × 15 × 4 cm | About 1.1 kg | Flex 3:1 |
Split the total into Part A and Part B
Fusion kits are mixed by weight:
- 2:1 resin: Part A = total × 2 ÷ 3, Part B = total ÷ 3. For 220 g → about 147 g + 73 g.
- 3:1 resin: Part A = total × 3 ÷ 4, Part B = total ÷ 4. For 400 g → 300 g + 100 g.
More on measuring and mixing in How to Mix Epoxy Resin Correctly.
Which kit size covers your project?
| Kit | Total resin | Roughly enough for |
|---|---|---|
| Vitro 2:1 – 300g | 300 g | 2 coaster sets, or one tray, or keychains and a nameplate |
| Vitro 2:1 – 750g | 750 g | Several trays and clocks |
| Vitro 2:1 – 1.5kg | 1.5 kg | Regular coating work and bigger batches |
| Flex 3:1 – 400g | 400 g | One small flower block |
| Flex 3:1 – 1.2kg | 1.2 kg | A varmala block or several deep moulds |
Tips for deep and large pours
- Thin coats: Vitro 2:1 is made for coats of 3–4 mm. For a thicker finish, add a second coat after the first cures.
- Deep pours: Flex 3:1 can go up to 2 inches per layer. For deeper pieces, pour in layers and let each one firm up first.
- Edges and drips: coating a board where resin runs over the sides uses more — add 20–25% extra instead of 10%.
- Measure the inside of the mould, not the outside.
Skip the maths.
Our resin calculator works out the grams, the Part A / Part B split and the kit that covers your project.
FAQs
How many grams of resin for one coaster?
A 10 cm round coaster at about 3 mm thick needs roughly 25–30 g of mixed resin.
How do I convert ml of resin to grams?
Multiply millilitres by about 1.1. For example, 200 ml of mixed epoxy weighs roughly 220 g.
Is it better to mix extra resin?
A small extra amount (10–15%) is smart. If you have leftover mixed resin, pour it into a spare keychain or coaster mould instead of wasting it.
Can I add a second coat if I didn't mix enough?
Yes. Let the first coat cure, lightly sand the surface if it's fully hard, wipe it clean and pour a second coat.