Epoxy Resin Calculator
Estimate how much epoxy resin and hardener you need for river tables, deep pours, art pieces, bar tops, and clear coatings. Supports US and metric units, multiple project types, and custom mix ratios.
Epoxy Resin Volume & Mix Ratio Calculator
Results
Total mixed epoxy required
- Volume (mL)
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- Volume (L)
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- Volume (fl oz, US)
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- Volume (US gal)
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- Approx. coverage at 1/8" (3 mm)
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Mix breakdown (by volume)
- Resin (mL)
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- Hardener (mL)
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- Resin (fl oz)
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- Hardener (fl oz)
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- Suggested number of layers
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How this epoxy resin calculator works
Epoxy projects fail most often because people mix too little or too much resin, or they pour too thick in a single layer. This calculator helps you:
- Convert your project dimensions into total mixed epoxy volume.
- Split that volume into resin and hardener based on your mix ratio.
- Add a realistic waste margin for sealing coats, drips, and absorption.
- Estimate how many layers you should pour for deep castings.
1. Volume calculation
The core formula is simply volume of a rectangular prism:
Rectangle / slab:
\( V = L \times W \times T \)
where:
- \( L \) = length
- \( W \) = width
- \( T \) = pour thickness
River table (approximate):
\( V = L \times W_{\text{river}} \times T \)
using the average river width \( W_{\text{river}} \).
Internally, the calculator converts your chosen units (inches or centimeters) to cubic centimeters (cm³), then to milliliters (1 cm³ = 1 mL). From there it converts to liters, fluid ounces, and US gallons.
2. Waste margin
Real‑world epoxy usage is always higher than the pure geometric volume. You lose material in mixing cups, on stir sticks, in drips, and in sealing coats. To account for this, the calculator multiplies the ideal volume by:
\( V_{\text{total}} = V_{\text{ideal}} \times (1 + w) \)
where \( w \) is the waste margin as a decimal (e.g. 10% → 0.10).
3. Resin vs hardener split
Epoxy systems are specified by a mix ratio such as 2:1 or 1:1 by volume. If the resin part is \( R \) and the hardener part is \( H \), the calculator computes:
\( \text{Total parts} = R + H \)
\( V_{\text{resin}} = V_{\text{total}} \times \dfrac{R}{R + H} \)
\( V_{\text{hardener}} = V_{\text{total}} \times \dfrac{H}{R + H} \)
This gives you separate resin and hardener volumes in mL and fl oz so you can mark mixing cups or use graduated containers.
4. Suggested number of layers
Every epoxy product has a maximum safe pour depth per layer. If your total thickness is \( T_{\text{total}} \) and your product’s maximum layer depth is \( T_{\text{max}} \), the minimum number of layers is:
\( N_{\text{layers}} = \left\lceil \dfrac{T_{\text{total}}}{T_{\text{max}}} \right\rceil \)
The calculator uses this to suggest how many pours you should plan for deep river tables or castings. Always verify against the manufacturer’s technical data sheet.
Practical epoxy coverage rules of thumb
- Flood coat / clear coat: about 16 fl oz (0.47 L) per square foot at 1/8" (3 mm).
- Thin seal coat: 3–5 fl oz (90–150 mL) per square foot, depending on wood porosity.
- Deep castings: volume scales linearly with thickness; double the thickness → double the epoxy.
The calculator’s “Approx. coverage at 1/8"” line helps you sanity‑check your numbers against these rules of thumb.
Tips for successful epoxy resin projects
Choose the right epoxy type
- Tabletops & bar tops: use a coating or tabletop epoxy with good UV resistance.
- River tables & deep pours: use a deep‑pour or casting epoxy formulated for thick layers.
- Art & jewelry: use a low‑viscosity art resin that self‑levels and releases bubbles easily.
Control bubbles and defects
- Seal porous wood with a thin epoxy coat before the main pour.
- Warm resin and hardener slightly (per manufacturer guidance) to reduce viscosity.
- Use a heat gun or torch lightly to pop surface bubbles after pouring.
- Avoid pouring in very humid or very cold environments.
Safety and handling
- Wear nitrile gloves, eye protection, and work in a well‑ventilated area.
- Avoid skin contact; uncured epoxy can cause irritation or sensitization.
- Follow the manufacturer’s safety data sheet (SDS) for your specific product.
Epoxy resin FAQ
How much epoxy resin do I need per square foot?
For a typical flood coat at 1/8" (3 mm) thickness, you need about 16 fl oz (0.47 L) of mixed epoxy per square foot. Thinner seal coats use less, and deep pours use more in direct proportion to thickness. The calculator converts your exact area and thickness into total volume automatically.
Can I reuse leftover mixed epoxy?
No. Once resin and hardener are mixed, the chemical reaction starts and cannot be stopped. You can pour leftovers into small molds or test pieces, but you cannot store and reuse them later. Only unmixed resin and hardener can be stored.
Why did my epoxy overheat or crack?
Overheating usually happens when you pour too thick in one layer or mix too large a batch in a single container. The reaction is exothermic and can build heat quickly. Use the “Max pour depth per layer” field to plan multiple thinner pours and always follow the manufacturer’s maximum recommended layer thickness.
Does this calculator work for all epoxy brands?
Yes, as long as you enter the correct mix ratio by volume and respect the product’s maximum pour depth. The geometry and volume math are the same across brands, but cure time, UV resistance, and safe layer thickness vary and must be checked on the product datasheet.