Resin Calculator
Calculate exact resin amounts for any mold or project.
Featured calculator below, plus 15 specialized tools for jewelry, coasters, tumblers, and
more.
No sign-ups. No stored data. Instant results.
Mold Volume → Resin Amount
Enter your mold dimensions to calculate exact resin needed (in ml and grams)
💡 For detailed calculations, use our full Mold Volume Calculator or browse specialized tools below.
👉 New to resin crafting?
Try the quick calculator above to see how much resin you need, then use the Small Batch Mixing Calculator for exact Part A & Part B measurements.
How much resin do I need? Quick reference
Common resin amounts by project type. All amounts include a 10% waste buffer and assume 1:1 mix ratio.
| Project | Resin needed | Calculator |
|---|---|---|
| Single earring (25mm round) | ~5 ml (5.5g) | Jewelry calc |
| Pendant (30×40mm oval) | ~10 ml (11g) | Jewelry calc |
| Bookmark (150×50×3mm) | ~25 ml (28g) | Bookmark calc |
| Single coaster (90mm round, 8mm deep) | ~56 ml (62g) | Coaster calc |
| Keychain (50×30×5mm) | ~8 ml (9g) | Keychain calc |
| Phone case (back layer) | ~15 ml (17g) | Phone case calc |
| Tumbler (single coat, 20oz) | ~60 ml (66g) | Tumbler calc |
| River table (6ft, 2" deep) | ~4-6 gallons | Large pour calc |
Amounts are estimates for typical dimensions. Use the linked calculators for exact measurements based on your specific mold size.
Popular resin brand mixing ratios
Different epoxy resin brands use different mixing ratios. Use our Small Batch Mixing Calculator with the correct ratio for your brand.
| Brand | Ratio (A:B) | Type |
|---|---|---|
| ArtResin | 1:1 by volume | Casting & coating |
| MAS Epoxies | 2:1 by volume | Table top & deep pour |
| Promise Epoxy | 2:1 by volume | Table top |
| SuperClear Epoxy | 2:1 by volume | Table top & casting |
| WiseBond | 2:1 by volume | Deep pour & table top |
| Alumilite Amazing Clear Cast | 1:1 by volume | Casting |
| Teexpert | 1:1 by volume | Casting & coating |
| Dr Crafty | 1:1 by volume | Craft & coating |
Always verify the ratio on your specific product label. Ratios may differ between the same brand's casting vs table top formulas. Use our mixing calculator for exact Part A and Part B amounts.
Essential Calculators
Start here for most resin projects
Small Batch Mixing Calculator
Perfect Part A & Part B measurements for any resin brand ratio
Start hereResin Jewelry Calculator
How much resin for earrings, pendants, and rings
Resin Mold Volume Calculator
Calculate volume for any mold shape — sphere, cube, cylinder, custom
Resin Color Mixing Calculator
Exact pigment and mica powder amounts for perfect colors
Project-Specific Tools
Calculators for popular resin projects
Resin Coaster Calculator
Calculate resin for single coasters or full sets
Resin Keychain Calculator
Batch production calculator for keychains
Tumbler Resin Calculator
Multiple coat calculations for perfect tumbler coverage
Resin Bookmark Calculator
Calculate resin for bookmark production runs
Phone Case Resin Calculator
Custom phone case resin calculations
Large Pour Calculator
River tables, countertops, and art pieces
Advanced Planning Tools
For experienced resin crafters
Resin Cost Calculator
Calculate total project costs and suggested retail prices
Resin Waste/Buffer Calculator
How much extra resin to mix to avoid running short
Multi-Layer Pour Calculator
Calculate sequential pours for layered effects
Temperature Adjustment Calculator
Adjust curing times based on room temperature
Resin Shelf Life Tracker
Track expiration dates and storage conditions
🛒 Need Resin Supplies?
Now that you know what you need to calculate, check out our recommended supplies:
Epoxy Resin Kits • Silicone Molds • Mica Powder Pigments • Digital Scale • Mixing Cups • Heat Gun
How to use resin calculators effectively
Step 1: Measure your mold accurately
Use a ruler or digital caliper to measure your mold dimensions in millimeters (mm) for best accuracy. For rectangular molds, measure length, width, and depth. For round molds, measure diameter and depth. Take measurements at the widest points and double-check — being off by 5mm can mean wasting resin or running short.
Step 2: Choose the right calculator
Use the quick calculator above for basic volume calculations, or choose a specialized calculator for your specific project:
- Jewelry Calculator — Pre-set dimensions for common jewelry molds
- Coaster Calculator — Batch calculations for coaster sets
- Tumbler Calculator — Multiple coat calculations
- Mixing Calculator — Exact Part A & Part B amounts
Step 3: Mix by weight, not volume
Once you have your resin amount (in ml or grams), use a digital scale to measure Part A and Part B. For most resins with 1:1 ratio, divide your total amount in half. For example, if you need 100g total resin, measure 50g Part A + 50g Part B. Our Small Batch Mixing Calculator handles any ratio (1:1, 2:1, 4:1).
Step 4: Add colors and additives
After mixing Part A and Part B, add mica powder or liquid dyes. For opaque colors, use 6-10% pigment by weight. For transparent tints, use 2-4%. Our Color Mixing Calculator gives exact amounts based on desired intensity.
Step 5: Always mix extra (10% buffer)
Mix 10-15% more resin than calculated. This accounts for waste stuck in mixing cups, resin lost to popping bubbles, and resin coating your stir sticks. Better to have small leftovers (pour into spare molds) than to run short mid-project. Use our Waste/Buffer Calculator for precise recommendations.
Resin crafting quick tips
⚖️ Always measure by weight
Use a digital scale for accuracy. Volume measurements can be off by 10-15%.
📏 Measure molds carefully
Take your time measuring mold dimensions. Being off by 5mm can mean wasting resin or coming up short.
➕ Mix 10% extra
Always mix slightly more than calculated. It's better to have leftovers than to run short mid-pour.
🌡️ Room temperature matters
Resin cures best at 70-75°F (21-24°C). Use our Temperature Calculator to adjust timing.
Common resin calculation questions
How do I calculate how much resin I need?
Measure your mold's dimensions (length, width, depth for rectangular molds, or diameter and depth for round molds). Use our Resin Mold Volume Calculator to convert measurements into exact resin amounts needed.
What's the mixing ratio for most resin brands?
Most craft resins use a 1:1 ratio (equal parts A and B), but some brands use 2:1 or 4:1 ratios. Always check your specific resin brand. Our Small Batch Mixing Calculator works with any ratio.
How much pigment should I add to resin?
For opaque colors, use 6-10% pigment by weight. For transparent tints, use 2-4%. Use our Color Mixing Calculator for exact amounts based on your desired intensity.
Should I measure resin by volume or weight?
Always measure by weight using a digital scale. Volume measurements using cups can be inaccurate due to air bubbles and resin density variations. Weight is the most reliable method.
How much extra resin should I mix?
Mix 10-15% more than your calculated amount. This accounts for waste in mixing cups, air bubbles you'll pop, and the resin that sticks to stirring tools. Use our Waste/Buffer Calculator for precise recommendations.
How do I convert resin from grams to ml?
For most epoxy resins, 1 ml weighs approximately 1.1 grams (density ~1.1 g/ml). To convert grams to ml, divide by 1.1. To convert ml to grams, multiply by 1.1. For example, 100 ml of resin weighs about 110 grams. Always check your specific brand's data sheet for exact density, as some specialty resins may differ slightly.
Can I mix different resin brands together?
No, never mix different resin brands or formulas together. Each brand has specific chemical ratios. Mixing brands can result in tacky resin that never fully cures. Stick to one brand per project.
How do I calculate resin for multiple items?
Calculate resin for one item, then multiply by the number of items you're making. Add 10% extra for waste. For batch production, use our project-specific calculators like the Keychain Calculator or Coaster Calculator.
Which resin calculator should I use first?
Start with the quick calculator at the top of this page to get a rough estimate of how much resin you need. Then use our Mold Volume Calculator for precise measurements, or choose a project-specific calculator like Jewelry, Coasters, or Bookmarks for pre-set dimensions and batch calculations.