How to use (3 steps)
- Choose Metric or US units, then set resin density and waste allowance.
- Pick a mode: surface (area × thickness), rectangular, cylinder, or known volume. Enter the dimensions.
- Hit Calculate, review volume & weight, and copy the URL to share the same setup.
A practical sample is loaded so results appear immediately.
Settings
Optional. Many epoxies are around 1.05–1.20 g/mL.
0–30%. Adds a margin for mixing loss and left-over material.
Optional. Limit volume per pour to plan multiple mixes.
Use wet film thickness; dry film will be thinner.
0–100%. Subtract wood/objects occupying the mold.
0–100%. Subtract wood/objects occupying the mold.
Use this if the cavity volume is already measured.
Results
Values auto-update as you edit.
Keep batches small to control heat; scrape cup walls when mixing.
What to open next
- If total resin volume is known and you need the exact Part A / Part B split, open Epoxy Mix Ratio.
- If the job spec is driven by coating thickness instead of pour depth, open DFT/WFT Calculator.
- If you are estimating a whole room, wall, deck, or fence purchase, switch to Paint Coverage Calculator after you confirm the surface area.
Related calculators
Epoxy planning: optimize for controlled batches, not just total volume
Total resin demand is only the first decision. Real-world epoxy work is constrained by pot life, ambient temperature, cup geometry, and mixing consistency. A correct total volume can still fail if single-batch size is too large and heat rises quickly. Use this calculator to separate project total from safe batch execution. Plan the number of batches first, then allocate time windows and tools per batch. This reduces waste, improves cure quality, and lowers the chance of rushed pours.
Recommended workflow
- Calculate total required volume with realistic waste and substrate assumptions.
- Apply product density only after confirming supplier data-sheet values.
- Set max per batch using conservative thermal and pot-life limits.
- Prepare a batch sequence plan (mix, pour, scrape, next cup) before starting.
Common mistakes
- Using a default density when product-specific density is published.
- Ignoring filler/pigment contribution to effective volume and mass.
- Rounding down to kit size and losing margin for spills or edge pooling.
Mini pour example
A project needs 3.2 L total with 10% waste, but safe cup size is 0.8 L. Instead of one large mix, split into four controlled batches and stage tools for each pour cycle. This keeps exotherm manageable and preserves working time. The small extra prep usually prevents expensive rework from partial cure defects.
See also
- Epoxy mix ratio calculator for Part A/B split by weight or volume.
- DFT/WFT calculator for coating-thickness conversion.
- Fence paint coverage calculator for area-driven material planning.
- Deck and terrace paint calculator for similar procurement logic.
FAQ
How much waste margin should I add?
5–15% is common. Rough surfaces, fillers, or colored pours may need closer to 20–30% while flat coatings can use less.
What density should I use?
Check the product data sheet. If you do not know it, try 1.10 g/mL. Set density to 0 to skip weight outputs.
Should I split into multiple batches?
Large batches can overheat. Keep each mix below your safe cup size or pot life. Use the max per batch field to split the total.
Does this include fillers or pigments?
Not automatically. If additives materially change mass or volume, include them in your waste or adjustment assumptions.
Should I round up to full kit sizes?
Usually yes. Round up to the next available kit and keep a small contingency for cup loss, edge sealing, and touch-up work.