Small Batch Mixing Calculator
Calculate exact Part A and Part B measurements for any resin brand ratio.
Perfect for small batches, jewelry, coasters, and craft projects.
No sign-ups. Instant results.
💡 Tip: Always use a digital scale for measuring by weight. It's more accurate than volume measurements.
Example calculation
Let's calculate measurements for a small jewelry project using ArtResin (1:1 ratio):
| Parameter | Value |
|---|---|
| Total resin needed | 100 grams |
| Resin ratio | 1:1 (equal parts) |
| Add 10% buffer | Yes |
| Part A (Resin) | 55 grams |
| Part B (Hardener) | 55 grams |
| Total mixed | 110 grams (with buffer) |
The 10% buffer (10 grams extra) accounts for waste and ensures you don't run short mid-pour.
Common resin brand ratios
| Resin Brand | Ratio (A:B) | Type |
|---|---|---|
| ArtResin | 1:1 | Craft/Art |
| Let's Resin | 1:1 | Craft/Jewelry |
| Dr Crafty | 1:1 | Craft/Art |
| Stone Coat | 1:1 | Table Top |
| TotalBoat ThickSet | 2:1 | Deep Pour |
| Famowood Glaze Coat | 1:1 | Table Top |
⚠️ Always check your specific product label. Ratios can vary even within the same brand's product line.
Accurate resin mixing tips
⚖️ Use a digital scale
Measure by weight, not volume. Get a scale that measures to 0.1g accuracy for small batches under 100g.
🧪 Mix thoroughly
Stir for 3-5 minutes, scraping sides and bottom. Unmixed resin will have soft spots that never cure.
🕐 Work within pot time
Most resins have 30-45 minute pot time. Mix small batches if you need more working time.
🌡️ Room temperature matters
Resin works best at 70-75°F (21-24°C). Cold resin is thick and hard to mix. Warm it in warm water first.
💡 Need supplies? Shop: Resin Kits • Digital Scales • Mixing Cups
Small batch mixing FAQs
What is the mixing ratio for most resin brands?
Most craft resins use a 1:1 ratio by volume or weight (equal parts A and B). However, some brands use 2:1, 3:1, or 4:1 ratios. Always check your specific resin brand's instructions. Popular brands like ArtResin use 1:1, while some deep pour resins use 2:1.
Should I measure resin by weight or volume?
Always measure by weight using a digital scale for accuracy. Volume measurements can be off by 10-15% due to air bubbles and density variations. Weight is the most reliable method and what professional resin crafters use.
How much extra resin should I mix?
Mix 10-15% more than your calculated amount. This accounts for waste in mixing cups, popping air bubbles, and resin that sticks to stirring tools. Use the buffer option in this calculator to automatically add 10% extra.
What happens if I get the ratio wrong?
Incorrect ratios result in resin that never fully cures or stays tacky forever. The chemical reaction between Part A and Part B requires precise ratios. Even being off by 5-10% can ruin your project. Always use a digital scale and follow your brand's exact ratio.
Can I mix different amounts of Part A and Part B if I run out?
No, never alter the ratio specified by your resin brand. If you run out of Part A or B, you must purchase more of that specific component. Changing the ratio will cause the resin to fail. Unopened resin components typically last 1-2 years when stored properly.
Can I mix resin in any container?
Use clean, disposable plastic or silicone mixing cups with smooth interiors. Avoid paper cups (resin can soak through), foam cups (resin melts them), or cups with ridges that make thorough mixing difficult. Graduated measuring cups help you see your amounts clearly.
How long do I need to stir resin?
Stir thoroughly for at least 3 minutes, scraping the sides and bottom of your cup. Inadequate mixing is one of the most common causes of resin failure. Set a timer—most people don't stir long enough. For larger batches (over 200g), stir for 5 minutes.