Epoxy Jewelry Calculator
Jewelry resin projects use tiny amounts — but getting the mix ratio right when working with 2–10 mL is actually harder than large pours. This guide gives you pre-calculated volumes for common jewelry molds and bezels, plus tips on mixing small batches accurately.
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Calculate Resin Amount →Pendant Bezel Volumes
Bezel volumes depend on the shape and depth of the setting. The table below shows common bezel sizes at 3mm depth (standard for most jewelry bezels).
| Bezel Shape & Size | Volume (mL) | Volume (fl oz) |
|---|---|---|
| Round 15mm dia | 0.5 mL | 0.02 fl oz |
| Round 20mm dia | 0.9 mL | 0.03 fl oz |
| Round 25mm dia | 1.5 mL | 0.05 fl oz |
| Oval 25 × 18mm | 1.1 mL | 0.04 fl oz |
| Oval 40 × 30mm | 2.8 mL | 0.09 fl oz |
| Square 20 × 20mm | 1.2 mL | 0.04 fl oz |
| Square 30 × 30mm | 2.7 mL | 0.09 fl oz |
| Rectangle 40 × 20mm | 2.4 mL | 0.08 fl oz |
| Large round 40mm dia | 3.8 mL | 0.13 fl oz |
All volumes at 3mm depth. Multiply by depth ratio for different depths (e.g., 4mm deep = × 1.33).
Ring Mold Volumes
| Ring Size (US) | Inner Diameter | Approx. Volume |
|---|---|---|
| Size 5 | 15.7mm | ~3–5 mL |
| Size 7 | 17.3mm | ~4–6 mL |
| Size 9 | 18.9mm | ~5–8 mL |
| Size 11 | 20.6mm | ~6–9 mL |
| Size 13 | 22.2mm | ~7–11 mL |
Ring mold volumes vary by band width (typically 6–12mm) and height. Add 20% extra for ring molds due to irregular shape.
Earring & Small Mold Volumes
| Mold Type | Size | Volume per Piece | Pair Total |
|---|---|---|---|
| Round stud | 12mm dia, 3mm deep | 0.34 mL | 0.7 mL |
| Round stud | 16mm dia, 4mm deep | 0.8 mL | 1.6 mL |
| Teardrop dangle | 15 × 20mm, 4mm deep | 0.9 mL | 1.8 mL |
| Hexagon | 25mm flat, 4mm deep | 2.2 mL | 4.4 mL |
| Large oval dangle | 20 × 35mm, 5mm deep | 2.7 mL | 5.4 mL |
| Triangle | 30mm sides, 4mm deep | 1.6 mL | 3.2 mL |
Pro tip: For the most accurate small-batch measurement, fill your mold with water, pour the water into a syringe or measuring cup, and read the exact volume. Then mix resin to that amount plus 10%.
Mixing Small Batches Accurately
- Use a jeweler's scale: For batches under 10 mL, measure by weight in grams rather than by volume. Check your resin's mix ratio by weight (often different from volume ratio).
- Minimum batch size: Most two-part resins need at least 5–10 mL total to cure properly. For smaller bezels, make a minimum batch and use leftover resin on backup pieces.
- Warm the resin first: Place the bottles in warm water for 5 minutes before mixing. Warm resin flows more easily into small bezels and produces fewer bubbles.
- Use a toothpick to fill: For tiny bezels, pour resin into a small cup and use a toothpick or fine-tipped applicator to drip resin into the bezel. Reduces spills and overfill.
- UV resin for small pieces: For single bezels under 2 mL, UV resin is often faster and easier — it cures in 1–5 minutes under a UV lamp and comes pre-mixed.
Frequently Asked Questions
How much resin do I need for a pendant bezel?
Most pendant bezels hold between 0.5 and 5 mL. A small oval bezel (25×18mm, 3mm deep) holds about 1.1 mL. A large round bezel (40mm diameter, 4mm deep) holds about 5 mL. Measure your specific bezel by filling it with water and reading the volume with a syringe.
What is the minimum amount of resin I can mix at once?
Most two-part epoxy resins require a minimum batch of 5–10 mL to mix properly. Below this, achieving an accurate ratio is difficult. For very small batches, weigh components on a jewelry scale in grams for accuracy.
Can I use any epoxy resin for jewelry?
No — use a jewelry-grade or casting resin that cures crystal clear with good UV resistance. Avoid tabletop or floor epoxies. UV resin is a popular alternative for thin bezels as it cures in minutes under a UV lamp.