Resin Mixing Ratio Calculator
Get perfect resin mixing ratios every time with our professional calculator. Eliminate curing failures, soft spots, and waste with precise measurements tailored to any epoxy resin brand and project size.
Common Mixing Ratios Quick Reference
2:1
Most Popular
2 parts resin : 1 part hardener
66.7% resin, 33.3% hardener
1:1
Table Top Epoxy
Equal parts
50% resin, 50% hardener
3:1
Casting Resin
3 parts resin : 1 part hardener
75% resin, 25% hardener
5:1
Marine Epoxy
5 parts resin : 1 part hardener
83.3% resin, 16.7% hardener
Always verify: Check your specific product label - ratios vary by manufacturer
Precise Mixing Calculations by Project Size
Small Pendant (50g total)
Ratio: 2:1
Perfect for jewelry and small crafts
Coaster Set (200g total)
Ratio: 1:1
Table top epoxy for functional items
Art Panel (500g total)
Ratio: 3:1
Casting resin for artistic projects
River Table (2000g total)
Ratio: 2:1
Large pour with standard ratio
Keychain Batch (100g total)
Ratio: 3:1
Multiple small items
Cutting Board (1000g total)
Ratio: 1:1
Food-safe epoxy application
Professional Mixing Process
Calculate Your Ratios
Determine exact amounts based on your project needs
Key Actions:
- Use our calculator to determine total resin needed
- Check manufacturer specifications for your brand
- Calculate resin and hardener amounts separately
- Add 10% extra for mixing losses and waste
Pro Tip:
Weight is more accurate than volume - always use a digital scale
Prepare Workspace & Materials
Set up for safe and accurate mixing
Key Actions:
- Work in 70-75°F temperature (21-24°C)
- Ensure good ventilation and wear safety gear
- Have digital scale, mixing cups, stirring stick ready
- Lay out drop cloths and have cleanup materials nearby
Pro Tip:
Temperature affects cure time - too cold prevents proper curing
Measure Components by Weight
Precise measurement is critical for proper cure
Key Actions:
- Zero (tare) your scale with empty container
- Add resin first to calculated weight
- Zero scale again, then add hardener
- Double-check measurements before mixing
Pro Tip:
Even 5% deviation in ratio can cause cure problems
Mix Thoroughly
Complete mixing ensures proper chemical reaction
Key Actions:
- Mix for minimum 3-5 minutes (longer for large batches)
- Use figure-8 or folding motion, not circular stirring
- Scrape sides and bottom frequently during mixing
- Look for uniform color and consistency
Pro Tip:
Under-mixing causes soft spots and incomplete cure
Apply Within Pot Time
Work quickly before mixture begins to cure
Key Actions:
- Check pot time on product specs (usually 20-45 minutes)
- Pour immediately after mixing is complete
- Work in thin layers for thick applications
- Remove bubbles with heat gun or torch if needed
Pro Tip:
Larger batches have shorter pot times due to heat buildup
Popular Brand Mixing Ratios & Specifications
| Brand/Product | Ratio | By Weight (100g total) | Pot Time | Work Temp |
|---|---|---|---|---|
| EpoxyPlus Table Top | 1:1 | 50g : 50g | 30 min | 70-80°F |
| West System 105/205 | 5:1 | 83.3g : 16.7g | 20 min | 60-80°F |
| EnviroTex Lite | 1:1 | 50g : 50g | 25 min | 70-85°F |
| ArtResin | 1:1 | 50g : 50g | 45 min | 72-75°F |
| TotalBoat 5:1 | 5:1 | 83.3g : 16.7g | 22 min | 70-80°F |
| Pro Marine Supplies | 1:1 | 50g : 50g | 40 min | 70-85°F |
| Entropy Resins CLR | 2:1 | 66.7g : 33.3g | 30 min | 70-78°F |
| System Three | 2:1 | 66.7g : 33.3g | 25 min | 70-85°F |
| Fiberglass Coatings | 3:1 | 75g : 25g | 35 min | 70-80°F |
| Smooth-Cast 325 | 1:1 | 50g : 50g | 7 min | 73-75°F |
* Always verify ratios with current product documentation - specifications may vary by batch or formulation
Avoid These Critical Mixing Ratio Mistakes
Measurement Errors
- • Using volume measurements instead of weight
- • Eyeballing ratios instead of precise measuring
- • Not accounting for container weight (tare function)
- • Assuming all brands use the same ratio
- • Using old or contaminated measuring tools
Application Errors
- • Working in wrong temperatures (too hot/cold)
- • Exceeding pot time before application
- • Under-mixing the components
- • Not accounting for batch size heat buildup
- • Ignoring humidity effects on curing
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