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Use this Resin Mixing Calculator to quickly work out exactly how much resin and hardener you need to measure for any epoxy project, based on your total mixed amount and product mix ratio. It supports mixing by weight or by volume and works with common ratios like 1:1, 2:1, 3:1, as well as fully custom resin‑to‑hardener ratios.
Instead of doing ratio math by hand, just enter how much mixed epoxy you need and your preferred measurement type; the calculator instantly splits it into the correct parts A and B so you can mix with confidence and minimize waste.
How to use the Resin Mixing Calculator
- Enter total mixed amount needed
- Type in how much epoxy you want to mix in one batch (for example, 300 g, 500 mL, 10 fl oz). This value usually comes from a volume or coverage calculator, or your project plan.
- Choose your measurement type
- Select whether you are measuring by:
- Grams (g) or kilograms (kg) – weight
- Ounces (oz, lb) – weight
- Milliliters (mL) or liters (L) – volume
- Fluid ounces (fl oz, cups) – volume
- Select the product mix ratio (Resin : Hardener)
- Pick the ratio specified on your epoxy label, such as:
- 1 : 1
- 2 : 1
- 3 : 1
- Or use the Custom fields to enter any other ratio.
- Calculate resin and hardener amounts
- Click Calculate to see:
- How much Resin (Part A) to measure
- How much Hardener (Part B) to measure
- A short summary like “For 300 g of mixed epoxy at 2:1, use 200 g resin + 100 g hardener.”
You can adjust the total mixed amount or ratio and recalculate as many times as you like until the numbers are convenient for your scale, cups, or syringes.
Formulas used for mixing ratios
To build trust, you can show the simple math behind the calculator.
If your epoxy has a mix ratio of Resin : Hardener = a : b and you want a total mixed amount TT (in any unit: g, mL, fl oz, etc.), then the calculator uses:
Resin amount=T×aa+bResin amount=T×a+ba
Hardener amount=T×ba+bHardener amount=T×a+bb
Examples:
- 1:1 ratio, total 400 g:
- Resin = 400 × 1/2 = 200 g
- Hardener = 400 × 1/2 = 200 g
- 2:1 ratio, total 300 mL:
- Resin = 300 × 2/3 = 200 mL
- Hardener = 300 × 1/3 = 100 mL
If you mix by weight but your manufacturer specifies the ratio by volume, you can optionally factor in resin and hardener densities (in g/mL) to convert volumes to weights. For most art epoxies, assuming 1 g ≈ 1 mL is a reasonable approximation, but the most accurate approach is to follow the datasheet.
Practical tips for accurate mixing
- Always double‑check the mix ratio printed on your resin and hardener containers; some deep‑pour or fast‑cure systems use unusual ratios.
- Use a scale that can measure at least to 1 g (or 0.1 g for small jewelry pours) when mixing by weight.
- When mixing by volume, use clear graduated cups or syringes to hit your marks precisely.
- Mix slowly and scrape the sides and bottom of the cup as recommended by the manufacturer to avoid soft spots or incomplete curing.