Resin Ratio Calculator – Epoxy & Hardener Mix
Calculate exact Resin (Part A) and Hardener (Part B) amounts for your pour
- Select Mode: Choose whether to calculate by your mold’s Dimensions or by a Total Amount you want to mix.
- Enter Ratio: Select your manufacturer’s mix ratio (e.g., 1:1 for coating, 2:1 for deep pour).
- Calculate: The tool instantly provides the exact amounts of Part A and Part B you need in your mixing cup.
Crucial Mixing Tip:
- Most epoxy brands specify their ratio by Volume (ml).
- If you use an epoxy resin calculator in grams, check your bottle! Hardener is often less dense than resin. A 1:1 volume ratio might actually be 100g Resin to 83g Hardener by weight.
- Always follow the manufacturer’s exact weight conversions if using a digital scale.
Pour Recipe
| Calculation Breakdown | Value |
|---|---|
| Enter dimensions or total amount to generate recipe. | |
Calculations based on standard polymer chemistry practices. Always cross-reference with your specific manufacturer’s safety data sheet (SDS).
Mastering the Epoxy Resin Ratio Calculator
Whether you are coating a canvas, casting a thick river table, or making custom jewelry, getting your epoxy mix chemically exact is the most critical step of the process. Too much resin, and your piece will be permanently sticky; too much hardener, and it may flash-cure, smoke, and crack. Using an accurate epoxy resin ratio calculator removes the guesswork, ensuring a perfect, glass-like cure every single time.
- Most consumer resins are designed to be measured by volume (ml), not weight.
- 1 cubic centimeter (cm³) of volume equals exactly 1 milliliter (ml) of liquid.
- Altering the ratio will not make the resin cure faster; it will ruin the chemical bond.
Ratio Calculators to find a wide range of useful calculators for different needs.
Measuring: Volume vs. Weight
A major point of failure for beginners is confusing an epoxy resin calculator in ml (volume) with an epoxy resin calculator in grams (weight). They are not interchangeable!
Because the hardener (Part B) is usually less dense and lighter than the resin (Part A), a 1:1 volume ratio does not mean a 1:1 weight ratio. If your bottle says “1:1 by volume” but you want to use a digital scale, you must consult the manufacturer. Often, a 1:1 volume mix translates to something like 100g of Resin to 83g of Hardener by weight. If you use a scale without adjusting the ratio, your cure will fail.
How to Calculate by Mold Dimensions
If you have an empty silicone mold and don’t know how much total liquid you need, use the epoxy resin calculator cm mode. By measuring the inside length, width, and depth of your mold in centimeters, the calculator finds the total volume in cubic centimeters (cm³).
Common Mix Ratios Explained
Different projects require different heat thresholds and curing times. Manufacturers formulate specific ratios to control the “exothermic” (heat-generating) reaction of the cure:
| Mix Ratio | Best Used For | Characteristics |
|---|---|---|
| 1:1 Ratio | Canvas art, tumblers, thin top-coats. | Fast curing (12-24 hours), thicker consistency, cures very hard. Generates high heat. |
| 2:1 resin calculator | Shallow silicone casts, serving trays, charcuterie boards. | Medium viscosity, slightly longer work time, excellent bubble release. Lower heat generation. |
| 3:1 resin calculator | Deep pours (River tables, thick floral encapsulations). | Very thin (water-like viscosity), slow curing (often 48-72 hours) to prevent overheating and cracking in thick layers. |
The Resin Calculation Formula
If you want to do the math manually, the standard resin calculation formula is straightforward. You just need your total required volume and your manufacturer’s A:B ratio.
Step 1: Total Parts = Ratio A + Ratio BTotal Parts = 2 + 1 = 3 partsStep 2: Resin (Part A) = (Total Volume ÷ Total Parts) × Ratio AResin = (600 ÷ 3) × 2 = 400mlStep 3: Hardener (Part B) = (Total Volume ÷ Total Parts) × Ratio BHardener = (600 ÷ 3) × 1 = 200ml
Frequently Asked Questions (FAQs)
Can I use a resin ratio calculator to speed up curing?
No. Adding extra hardener does not make the resin dry faster. Epoxy relies on a precise stoichiometric chemical reaction. Altering the required ratio will ruin the molecular structure, leaving your project permanently tacky.
Does adding liquid color pigments affect the ratio?
Generally, no, as long as you follow the golden rule of resin art: never add more than 5% to 10% of total volume in liquid pigments (like alcohol inks or liquid dyes). Too much liquid dye will interfere with the hardener’s ability to cross-link with the resin.
