Epoxy Floor Coverage Calculator: Gallons, Kits and Flakes
Work out how many gallons or kits of epoxy, polyaspartic or floor paint your garage floor needs from its size and the label coverage.
How much coating should you buy? Enter your floor size, the coverage rate printed on your product’s label, the number of coats and the kit size. The calculator works out gallons, kits and decorative flakes, with a little extra for porous concrete.
When this tool helps most
Use it while comparing products and before you order. Kits list very different coverage rates, so two kits at a similar price can cover very different areas. Running out halfway through a coat is a common cause of visible lap lines.
How to use this tool
- Measure the floor length and width at the widest points.
- Enter the coverage per gallon, per coat, from the product label or technical data sheet.
- Enter the number of coats and the gallons in one kit or can.
- Add a flake broadcast rate if you are using decorative flakes, then read the totals.
Worked example
A 22 by 22 foot floor is 484 square feet. With 2 coats at 250 square feet per gallon and 10 percent extra, it needs 4.3 gallons, which means 5 one-gallon kits. No flakes are entered in the default example.
Understanding your results
Buy the number of kits shown, from the same batch where possible. If your concrete is rough, porous or freshly ground, it will soak up more product, so keep the extra. Flake quantities depend on the look you want and the maker’s broadcast rate.
Common mistakes to avoid
- Using a coverage figure from a different product.
- Forgetting the second coat or the primer.
- Skipping the moisture test. Coatings fail on damp slabs regardless of quantity.
- Mixing more than you can apply within the product’s pot life.
How to get the most accurate result
- Measure your own garage with a tape measure instead of using typical sizes.
- Use the numbers printed on your product labels, manuals and data sheets.
- Change one input at a time to see which assumption matters most.
- Print or save the result and bring it to your installer or contractor.
Next steps
Follow the step-by-step epoxy guide and compare systems in polyaspartic vs epoxy.
Frequently asked questions
Multiply the floor area by the number of coats and divide by the label coverage per gallon, then add some extra. Coverage varies by product and by how porous the concrete is. Many coating systems call for a primer or base coat, especially on porous concrete. Follow the system your product’s instructions describe. Use the broadcast rate in the flake maker’s instructions. A light scatter uses far less than a full broadcast that covers the base coat completely.How much epoxy do I need for a two-car garage?
Do I need a primer coat?
How many pounds of flakes do I need?
This tool is for planning and education only. It does not store your entries. Garage door springs and cables are jobs for a trained technician, and new circuits are jobs for a licensed electrician. Read our disclaimer.