Resin Mix Ratio Calculator
Calculate exact Part A and Part B amounts for any epoxy resin mix ratio.
Mix Type
Quick Presets
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Weight vs. Volume Measurement
Many resins specify their ratio by volume, but measuring by weight on a digital scale is far more accurate — graduated cups have wide tolerances. However, you must use the manufacturer's weight ratio (not the volume ratio) when measuring by weight, as Part A and Part B often have different densities.
Always check your specific product's datasheet. A 2:1 volume ratio may be a different ratio by weight for the same product.
Pot Life Reference
| Resin Type | Typical Pot Life | Cure Time |
|---|---|---|
| Casting resin (thin pour) | 30–45 min | 12–24 hrs |
| Epoxy coating (table top) | 20–30 min | 24–72 hrs |
| UV resin | N/A (light activated) | 1–5 min UV |
| Polyurethane (fast) | 3–5 min | 30 min demold |
| Silicone | 10–20 min | 4–16 hrs |
Why Accuracy Matters
An off-ratio mix will not cure properly — it may remain sticky, soft, or never harden at all. Even a few percentage points off can result in a failed pour. Use a scale with 0.1g accuracy for small batches.