Epoxy Coverage Calculator
Work out how much epoxy you need. Enter your floor area, coats, and a product or your own coverage rate to get total volume, kits to order, and the Part A/B mix.
Last updated August 17, 2026
Calculate Your Epoxy Coverage and Kits
Enter your floor area and the number of coats, then either select a product or choose "Custom" and type in the coverage rate from your product's data sheet. The calculator outputs total volume needed in gallons or liters, full kits to order, and the exact Part A and Part B quantities to mix.
Coverage assumes smooth, prepared concrete. Porous or rough concrete may require additional material.
How the Epoxy Coverage Calculator Works
- Select your epoxy product from the dropdown, or choose "Custom" and enter the coverage rate from your product's technical data sheet (TDS)
- If the product supports multiple application types (Flake, Solid Color, or Metallic), select the relevant one
- Choose your area unit (Square Feet or Square Meters), then enter the floor area
- Set the number of coats
- The calculator outputs total volume needed, kits to order, and Part A / Part B mix quantities
- Enable the waste allowance to add a buffer for edges, substrate absorption, and overspray
Examples
Frequently Asked Questions
How much does 1 gallon of epoxy cover?
It depends on solids content and film thickness. A 100% solids floor epoxy typically covers 140 to 200 ft² per gallon per coat (roughly 3.5 to 5 m² per liter). Thinner water-based or solvent-based products stretch further (often 250 to 300 ft² per gallon) because part of the wet film evaporates. Your product's technical data sheet lists the exact rate; enter it in the calculator using the Custom option.
How much epoxy do I need for a 2-car garage?
A typical two-car garage is 400 to 500 ft² (about 37 to 46 m²). At 150 ft² per gallon, two coats need roughly 5.5 to 7 gallons of mixed product, usually two 3-gallon kits. Enter your exact floor area and coverage rate above to get the precise figure for your job.
What does coverage rate mean?
Coverage rate (m²/L or ft²/gal) tells you how much area one liter or gallon of mixed product will cover at the specified film thickness. A thicker application reduces the coverage area.
Why does the calculator round up to full kits?
Epoxy is sold in pre-measured kits with a fixed A:B ratio. You cannot split a kit and maintain the correct mix ratio, so you must always purchase whole kits.
How accurate are the coverage rates?
Coverage rates are based on manufacturer specifications at the recommended film thickness. Actual yield varies with surface texture, application method, and ambient conditions. Confirm rates using the product data sheet (TDS) before ordering.
Should I apply one coat or two coats?
Two coats is standard for most residential and commercial epoxy floor systems. The first coat penetrates and bonds to the substrate; the second coat builds film thickness, improves coverage uniformity, and protects against pinholes or thin spots. One coat may be appropriate for primer applications or when the manufacturer's TDS specifically recommends it for a given substrate. For decorative systems with flake or metallic, the first coat is usually the base, so a clear topcoat brings the total to at least two.
Where do the coverage rates in the product list come from?
Two places, and the tool tells you which. A product marked as coming from the manufacturer's data sheet links to that sheet and names the revision that was read; its coverage rate also shows the film thickness it is quoted at, because a rate without a thickness is not a specification. The rest are examples: real product names, because that is what people search for, but figures nobody here has checked, and the tool says so on screen. Either way, confirm the sheet packed with the batch you buy, since manufacturers re-spec products.
Why does the coverage rate show a film thickness next to it?
Because coverage is a consequence of thickness, not a property of the product. A 100% solids epoxy spread at 10 wet mils covers about 160 ft² per gallon; the same gallon at 30 wet mils covers about 53 ft². Data sheets publish a range for exactly that reason, so this tool names the point on that range its stored rate came from. If you are building to a different thickness, work out your own rate with the Film Thickness and Coverage Calculator and enter it as a custom rate.
My product is not listed. What should I do?
Check your product's technical data sheet (TDS) for the coverage rate and mix ratio. These figures are published by the manufacturer or available from your supplier. Select the closest matching product and adjust your order accordingly.
Important Notes
- Coverage rates are estimates based on manufacturer specifications at the recommended film thickness
- Porous, rough, or unsealed concrete typically requires 20% to 30% more material than smooth, prepared surfaces
- Film thickness directly affects yield, so a thicker application reduces coverage
- Always verify coverage rates using the product data sheet (TDS) before placing your order
- Epoxy is sold in fixed kit sizes; purchasing whole kits often results in a small surplus volume