Crafts & Making
Epoxy Resin Calculator
Split a resin pour into parts A and B in the ratio's declared basis.
Enter your measurements
Results update as you type.
About this calculator
Start from a known mixed volume, a known mixed mass, or the pour dimensions less any displacement. Enter your manufacturer's A:B ratio and say whether that ratio is by volume or by mass. A mixed density bridges the two bases only when you supply it — a volume ratio is never applied to mass.
How to measure
- Measure rectangular length/width/depth or circular diameter/depth, or enter a known mixed quantity.
- Subtract the volume displaced by inclusions before applying an allowance.
- Enter both parts of the manufacturer ratio and its mass/volume basis. A mixed density is required only when bridging those bases.
How to use this calculator
- Choose whether you know the mixed volume, mixed mass or the pour dimensions.
- Enter the manufacturer's A:B ratio and its basis.
- Supply a mixed density only if you need the other basis.
- Add an allowance if your pour needs one.
- Calculate for the total and parts A and B.
Formula
Pour volume = geometry − displacement (geometry mode)
Target = known quantity × (1 + extra ÷ 100)
Volume basis: A = target × a ÷ (a + b); B = target − A
Mass basis: A = target × a ÷ (a + b); B = target − A
Mass ↔ volume only with the supplied mixed density
Assumptions
- The ratio is the manufacturer's product ratio, not a recommendation.
- A mass ratio is never applied to a volume or the reverse without density.
- Displacement is subtracted before the allowance is applied.
Common mistakes
- Swapping a volume ratio for a mass ratio.
- Using cured-resin density as uncured mixed density.
- Assuming mixed density determines both component densities.
Worked example
Try it: press “Load example” above the form.
900 mL at a 2:1 volume ratio splits into 600 mL of A and 300 mL of B.
Limitations
Quantity arithmetic only. No safe pour depth, cure schedule, PPE, compatibility or ratio recommendation.
Frequently asked questions
Can I swap a volume ratio for a weight ratio?
No. A:B by volume and A:B by mass are different instructions. Use the manufacturer’s stated basis; a mixed density cannot tell you the separate component densities.
When do I need mixed density?
Only when converting a total mixture mass to volume or volume to mass. Use the uncured mixed product data or a measured value. Cured resin density is not automatically the same.
What does the worked example show?
900 mL at a 2:1 volume ratio splits into 600 mL of A and 300 mL of B.
Which assumptions should I check before using the result?
Quantity arithmetic only. No safe pour depth, cure schedule, PPE, compatibility or ratio recommendation.
Sources
Sources explain the methods and any named product presets. Check your product label where coverage, yield or density differs.
- ArtResin: volume calculator
Rectangle/circle quantity context only. Component ratio and ratio basis must match your product instructions.
Calculation documentation · Updated 2026-11-08 · Version 1.6.4. Estimates are planning aids. Confirm quantities, coverage and prices with your supplier before purchasing. Found an error? Report it.
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