How Much Epoxy Do I Need?
There is no single fixed amount. The required epoxy depends on the volume of the space being filled.
To find the volume, use this formula: Length × Width × Thickness = volume.
Once you have the volume, you convert it into liquid measurements like gallons or liters, and finally adjust it for waste.
How to Calculate How Much Epoxy You Need
Calculating your epoxy requirements is a step-by-step mathematical process:
Calculation Example:
For a project that is 48 inches long, 24 inches wide, and 2 inches deep:
- 48 in × 24 in × 2 in = 2,304 cubic inches
- With a 10% waste allowance: 2,534.4 cubic inches
- Convert to gallons (1 US liquid gallon = 231 cubic inches)
- Result: approximately 10.97 gallons
Note: This is a mathematical example based on pure volume, not a specific product recommendation.
How Much Epoxy Resin Do I Need?
The total required mixed epoxy depends on the physical volume of your project and your waste allowance. However, the specific amounts of Part A (Resin) and Part B (Hardener) you need depend entirely on the manufacturer's specified mix ratio. A 1:1 ratio requires equal parts of both, while a 2:1 ratio requires twice as much resin as hardener for the same total volume.
How Much Resin Do I Need?
The calculator above determines exactly how much resin you need by calculating the total mixed volume from your dimensions, and then splitting that total according to the mix ratio you select.
How Much Epoxy Do I Need for Different Projects?
Because thickness and project geometry change the total volume, the amount of epoxy required varies wildly across project types:
- Tabletops & Bar Tops: Usually require a very thin flood coat (1/8" to 1/4") over the surface area.
- River Tables & Deep Pours: Often poured in thick sections (1" to 2" or more), requiring significantly more volume per square foot.
- Countertops: Typically involve multiple thin coats and heat-resistant topcoats.
- Floors & Coatings: Epoxy flooring typically covers large areas at extremely thin depths.
How Much Epoxy Covers One Square Foot?
There is no universal coverage rate because the required volume equals the surface area multiplied by the thickness (volume = area × thickness). A thin 1/8-inch seal coat will cover significantly more square footage per gallon than a 1-inch deep pour. Always refer to your specific product's instructions for recommended pour depths and coverage rates.
How Much Waste Should I Add?
Waste or spill allowance depends on your specific project and workflow. The calculator defaults to 10%, which covers typical scenarios like resin left behind on the sides of mixing buckets, edge drips, and minor measurement errors. You can adjust this percentage based on your experience and project requirements.
How the Epoxy Calculator Works
The calculator processes your inputs sequentially: it multiplies your dimensions to find the base volume, adds your waste percentage, converts the total cubic volume into liquid gallons or liters, and finally splits the total into precise resin and hardener quantities based on your mix ratio.
Frequently Asked Questions
How much epoxy do I need for a table?
It depends on the table's dimensions and the thickness of the epoxy layer. Measure the length and width of the tabletop and determine how thick you want the epoxy coat to be, then use the calculator to find the exact volume.
How much epoxy resin do I need?
Calculate the total mixed volume based on your project dimensions, then check your epoxy's mix ratio to determine the exact amount of resin (Part A) required.
How much resin do I need?
The exact amount of resin needed is a fraction of the total mixed volume, determined by the manufacturer's mix ratio (e.g., 1/2 of the total for a 1:1 ratio, or 2/3 of the total for a 2:1 ratio).
How much epoxy do I need for a river table?
River tables require measuring the irregular shape of the "river." Estimate the average width and multiply it by the length and depth to find the approximate volume.
How much epoxy do I need for a deep pour?
Deep pours require high volumes of epoxy due to their thickness. Use the calculator to multiply the length, width, and depth (often 1" to 2" or more) to find the required amount.
How much epoxy do I need per square foot?
Coverage per square foot depends entirely on the thickness of the pour. For example, 1 gallon covers approximately 1.6 square feet at a 1-inch depth, but covers roughly 12.8 square feet at a 1/8-inch depth.
How much waste should I allow?
A 10% waste allowance is typically recommended to account for mixing container residue, spills, and drips over edges.
What resin to hardener ratio should I use?
You must use the exact ratio specified by your epoxy manufacturer on the product label. Common ratios include 1:1 for tabletops and 2:1 or 3:1 for deep pours.
Ready to start? Head back to the main Epoxy Calculator to test different dimensions.