Epoxy Resin Volume Calculator
Calculate exact Part A & Part B resin amounts for coasters, dominoes, and molds.
Total Volume (with Buffer)
Total Volume in Ounces
Part A (Resin) Needed
Part B (Hardener) Needed
Resin Mix Ratio Split
Volume Measurement Breakdown
* Calculations account for 5% buffer. 1 cubic inch = 16.387 ml. © Toolriz.com.
Epoxy Resin Volume Calculator: Perfect Pours for Coasters & Dominoes
The epoxy resin crafting industry has exploded across the USA, with thousands of independent makers creating stunning custom coasters, dominoes, and charcuterie boards to sell on Etsy and at local craft fairs. However, resin is an unforgiving medium. Measure too little, and you run out mid-pour, ruining the batch. Measure too much, and you are pouring expensive, leftover liquid down the drain. Worse, getting the mix ratio wrong results in a sticky, uncured mess that wastes hours of labor. The Epoxy Resin Volume Calculator by Toolriz.com is an ultra-advanced crafting tool designed to instantly calculate the exact volume of resin needed for your silicone molds. It converts your measurements into milliliters (ml) and US fluid ounces (oz), factors in a waste buffer, and splits the exact amounts of Part A (Resin) and Part B (Hardener) for both 1:1 and 2:1 mix ratios.
Whether you are pouring a set of 4 standard coasters or a full set of 28 dominoes, this guide and calculator will ensure your pours are mathematically flawless, saving you money and preventing curing failures.
How to Use the Epoxy Resin Calculator
Using our calculator takes less than a minute. Follow these steps to map out your next resin pour:
- Select a Preset (Optional): Use the quick buttons for standard coasters (4" x 4" x 0.5") or standard dominoes (2" x 1" x 0.4").
- Enter Dimensions: Input the Length, Width, and Depth (thickness) of your silicone mold in inches. These are USA standard measurements.
- Enter Quantity: Input how many pieces you are pouring in this batch.
- Select Mix Ratio: Check your resin bottle and select either 1:1 (equal parts) or 2:1 (two parts resin, one part hardener).
- Review Your Dashboard: Instantly view the Total Volume needed (in ml and oz), and the exact Part A and Part B amounts to pour into your mixing cup.
The Math of Resin: Cubic Inches to Milliliters
Most USA silicone molds are sold with dimensions listed in inches, but resin mixing cups are printed with milliliters (ml) and fluid ounces (oz). This unit mismatch is the #1 cause of measurement errors. To find your resin volume, you must calculate the volume in cubic inches (Length × Width × Depth) and then convert it.
One cubic inch is equal to exactly 16.387 milliliters. If you are pouring a 4x4 inch coaster that is 0.5 inches thick, the volume is 8 cubic inches (4 × 4 × 0.5). Multiply 8 by 16.387, and you need exactly 131.1 ml of total resin for one coaster. The Toolriz calculator handles this complex conversion instantly, allowing you to work in inches but measure in milliliters.
The 5% Waste Buffer: Why You Always Need Extra
Never calculate your resin volume down to the exact drop. Resin is a viscous liquid that clings to mixing cups, stirring sticks, and the edges of your mold. If you calculate exactly 100 ml, by the time you pour it into the mold, you will only have 95 ml left, leaving your coasters slightly short and requiring a messy second top-off pour.
Our calculator automatically applies a 5% waste buffer (which you can adjust up to 10% or 20% for deep pours). This ensures you have enough resin to fill the mold completely, account for stickiness in the cup, and still have a tiny drop left over to test the cure time. It is always cheaper to waste 5% of a batch than to ruin a 4-hour project by running out.
1:1 vs. 2:1 Mix Ratios: Understanding the Chemistry
Epoxy resin consists of two parts: the Resin (Part A) and the Hardener (Part B). When these two chemicals combine, an exothermic reaction occurs, turning the liquid into a solid plastic. Getting this ratio mathematically perfect is non-negotiable.
1:1 Ratio (Equal Parts)
The vast majority of USA craft resins (like ArtResin or Alumilite Amazing Clear Cast) use a 1:1 ratio. This means for every unit of Part A, you need an identical unit of Part B. If your total volume needed is 200 ml, you pour 100 ml of Part A and 100 ml of Part B. 1:1 resins are incredibly forgiving and perfect for beginner coaster makers.
2:1 Ratio (Resin to Hardener)
Deep pour resins (like TotalBoat High Performance) often use a 2:1 ratio to prevent the mixture from getting too hot and cracking in deep molds. This means you need two parts Resin (Part A) for every one part Hardener (Part B). If your total volume is 300 ml, you need 200 ml of Part A and 100 ml of Part B. Getting this math wrong will result in a permanently tacky, uncured mess. The calculator’s built-in ratio logic handles this split flawlessly.
| Project Type | Total Volume Needed | Part A (1:1 Ratio) | Part B (1:1 Ratio) |
|---|---|---|---|
| 4 Standard Coasters (4x4x0.5) | ~550 ml | 275 ml | 275 ml |
| 10 Standard Dominoes (2x1x0.4) | ~135 ml | 67.5 ml | 67.5 ml |
| 1 Large Tray (10x8x0.5) | ~680 ml | 340 ml | 340 ml |
USA Crafting Economics: Pricing Your Resin Coasters (Geo-Optimization)
If you are selling resin coasters on Etsy or at USA craft fairs, knowing your exact volume is critical for pricing your products. A standard 32 oz kit of ArtResin costs roughly $50 USD. That means your resin costs about $1.56 per fluid ounce, or $0.05 per milliliter.
If a coaster requires 130 ml of resin, your raw material cost for the resin alone is $6.50. Add in the cost of the silicone mold lifespan, alcohol inks, glitter, and PPE (nitrile gloves and respirator cartridges), and your cost per coaster rises to about $8.00. If you sell that coaster for $15, you are making a healthy 46% profit margin. But if you guess your pour and waste 50% of your resin, your costs double, and you are losing money. Tracking your exact milliliters using this calculator is the key to running a profitable USA craft business.
Safety and Exothermic Reactions in the USA
Epoxy resin is a chemical compound, and USA safety regulations (OSHA) require proper handling. When Part A and Part B mix, they generate heat (an exothermic reaction). If you mix a batch that is too large, the heat can cause the plastic cup to melt, boil the resin, and release toxic VOCs (Volatile Organic Compounds). Always mix batches under 32 ounces (1 liter) at a time, and work in a well-ventilated space wearing a NIOSH-approved respirator if using non-food-safe resin. Never pour resin deeper than the manufacturer's recommended maximum depth (usually 1/4 inch to 1/2 inch per layer for fast-curing resin).
Frequently Asked Questions (AEO Section)
How much resin do I need for 4 coasters?
For 4 standard round or square coasters (measuring 4 inches wide and 0.5 inches thick), you need approximately 550 milliliters (18.5 fluid ounces) of total mixed resin. This includes a 5% waste buffer to account for residue left in the mixing cup.
How do you calculate resin volume for a mold?
To calculate resin volume, multiply the Length by the Width by the Depth of the mold in inches to get cubic inches. Multiply the cubic inches by 16.387 to convert to milliliters. Add 5% for waste, then split the total by your mix ratio (1:1 or 2:1) to find Part A and Part B.
What happens if I put too much hardener in resin?
If you add too much hardener (Part B), the resin will cure too fast, resulting in an extreme exothermic reaction. The resin may turn yellow, bubble excessively, crack, or even melt the plastic mixing cup. Always measure your parts precisely using a graduated silicone cup or a digital scale.
Can I measure resin by weight instead of volume?
Yes, and it is often more accurate. Most 1:1 resins have a similar density, meaning 100ml of Part A weighs roughly the same as 100ml of Part B. However, 2:1 resins have different densities. Check your manufacturer's technical data sheet (TDS) for weight ratios (e.g., 100 grams Part A to 45 grams Part B) if you prefer using a digital jewelry scale.
Conclusion: Pour with Confidence
Resin crafting is a beautiful blend of art and chemistry. By eliminating the guesswork in your volume calculations, you guarantee consistent, bubble-free, fully cured coasters and dominoes every single time. Use the Toolriz Epoxy Resin Volume Calculator to map out your pours, protect your profit margins, and elevate your crafting business to a professional standard.
Disclaimer: Toolriz.com is not affiliated with ArtResin, Alumilite, or TotalBoat. Always refer to the specific manufacturer’s Technical Data Sheet (TDS) for exact mix ratios and safety guidelines before pouring epoxy.