Epoxy Resin Calculator
Calculate exactly how much epoxy resin you need for your art, table, or floor project. Enter your dimensions below to instantly find total volume and precise Part A/B mixing ratios.
Whether you are coating a canvas in art resin, casting a deep-pour river table, or sealing a garage floor, accurately calculating your epoxy resin volume is critical. Mixing too little ruins your working time (pot life) as you rush to mix a second batch, while mixing too much wastes an expensive product.
The interactive resin calculator above determines exactly how much total volume you need based on your specific mold or surface dimensions. It also breaks down the exact amounts of Part A (Resin) and Part B (Hardener) you need to measure out, ensuring a perfect chemical cure every time.
How to Calculate How Much Resin You Need
To find the total volume of resin required, you must find the cubic volume of the space you are filling. You do this by measuring the inside dimensions of your mold or the surface area of your project.
For Rectangular Projects (Tables, Canvases, Floors):
Volume = Length × Width × Depth (Thickness)
Example: A 24″ x 12″ serving tray poured to a depth of 0.25″ requires 72 cubic inches of resin.
For Circular Projects (Coasters, Round Tables):
Volume = π × (Radius)² × Depth
*Note: The radius is exactly half of the total diameter across the circle.
Once you have the cubic volume in inches (cu in) or centimeters (cm³), you must convert it into a liquid measure. Our calculator does this automatically using the following precise conversion factors:
- 1 Cubic Inch = 0.554113 Fluid Ounces (fl oz)
- 1 Cubic Inch = 16.387 Milliliters (ml)
- 1 Cubic Centimeter (cm³) = 1 Milliliter (ml)
Understanding Epoxy Resin Mixing Ratios
Epoxy resin comes in two parts: Part A (the resin) and Part B (the hardener). They must be mixed in a very specific ratio to trigger the chemical reaction that hardens the plastic. Never guess or “eyeball” the ratio. If the ratio is off, the epoxy will remain tacky, soft, or cloudy.
Common mixing ratios by volume include:
- 1:1 Ratio: The most common ratio for art resin, tabletop epoxy, and doming resins. You mix exactly equal parts of A and B.
- 2:1 Ratio: Standard for “Deep Pour” or casting resins. You use twice as much Part A as Part B. This slows down the curing process, preventing the resin from overheating when poured in thick layers (up to 2 inches).
- 3:1 or 4:1 Ratio: Commonly found in marine epoxies, structural fiberglass layups, and specific industrial floor coatings.
Most commercial epoxies are formulated to be measured by Volume (using measuring cups). Unless the manufacturer’s instructions specifically state to measure by weight, do not use a digital scale. Part A and Part B have different densities; measuring a 1:1 volume epoxy by weight will result in an improper cure.
Standard Resin Coverage Chart (Square Footage)
If you are coating a floor, sealing a countertop, or doing a thin seal coat on wood, manufacturers often list their product in terms of “gallons” and “square footage coverage.”
The table below shows the approximate coverage of exactly 1 mixed gallon of epoxy resin based on the poured thickness.
| Poured Thickness | Application Type | Coverage (Per 1 Gallon) |
|---|---|---|
| 10 mils (0.010″) | Thin Floor Roll-on Coating | ~160 Square Feet |
| 1/16 Inch (0.0625″) | Standard Seal Coat / Art Coat | ~25 Square Feet |
| 1/8 Inch (0.125″) | Standard Bar Top / Table Top Pour | ~12 Square Feet |
| 1/4 Inch (0.25″) | Thick Protective Coating | ~6 Square Feet |
| 1 Inch (1.0″) | Deep Pour Casting | 1.6 Square Feet |
Why You Need a Resin Loss Allowance
By default, our resin calculator adds a 10% Loss Allowance to your total requirement. We highly recommend leaving this checked.
Mathematical volume is perfect on paper, but in the real world, resin is sticky and viscous. You will inevitably lose product to:
- Resin clinging to the sides and bottom of your mixing cups.
- Resin dripping off the mixing sticks.
- Over-spillage when coating edges (like a table top).
- Slight, unnoticed leaks in silicone or taped molds.
Running out of mixed resin with only 5% of your project left is a stressful nightmare. Mixing a 10% safety buffer guarantees you have enough working material.
Frequently Asked Questions
To calculate how much resin you need for a rectangular project, measure the inside dimensions of your mold (Length × Width) and multiply by the desired Depth (thickness). This gives you the cubic volume. You can then convert cubic inches or cubic centimeters into fluid ounces (fl oz) or milliliters (ml) to know exactly how much to mix.
While there are standalone apps in the app stores, this web-based resin calculator functions exactly like a native app. It runs instantly in your browser on mobile or desktop without requiring a download, allowing you to calculate resin volumes and mixing ratios on the fly.
For a standard floor coating at a thickness of 10 to 12 mils (about 1/16 inch), one gallon of epoxy covers roughly 130 to 160 square feet. Therefore, to cover 400 square feet, you will need approximately 2.5 to 3 gallons of mixed epoxy resin.
Assuming a standard roll-on floor coating application (10-12 mils thick), you will need roughly 6 to 8 gallons of mixed epoxy to cover 1000 square feet. If you are doing a metallic epoxy floor or a thicker self-leveling pour, you may need 15 to 20 gallons.
A 5-gallon bucket of mixed epoxy applied as a standard thin floor coating (around 10 mils thick) will cover approximately 750 to 800 square feet. If poured thicker (like a 1/8-inch bar top coat), it will only cover about 60 to 70 square feet.
Yes, but you must use a specific ‘Deep Pour’ or casting epoxy. Standard tabletop epoxies cure too quickly; pouring them 2 inches thick will cause a dangerous exothermic reaction (overheating, smoking, and cracking). Deep pour epoxies cure slowly over 48-72 hours to dissipate heat safely.
Usually, yes. The ideal time to pour a second layer is during the ‘B-stage’ of curing, which is typically between 8 to 24 hours when the first layer is tacky like tape but firm enough that a fingernail doesn’t leave a deep dent. This allows for a strong chemical bond without needing to sand.
White vinegar is highly effective at breaking down uncured epoxy resin. It is an excellent, non-toxic solvent for cleaning your hands, tools, and accidental spills before the resin has hardened. It will not dissolve fully cured epoxy.
Epoxy will not adhere to silicone, polyethylene plastics (like HDPE cutting boards or plastic sheeting), wax paper, or surfaces treated with a mold release agent. Tape (like Tyvek or standard packaging tape) is also commonly used to create non-stick barriers for resin molds.
Reference: https://en.wikipedia.org/wiki/Resin