# Epoxy and Resin Coverage Calculator

> Calculate amount of epoxy resin needed for floor coatings, countertops, or casting based on area and thickness

**Category:** Construction
**Keywords:** epoxy, resin, coverage, floor coating, countertop, casting, gallons, thickness, area
**URL:** https://complete.tools/epoxy-resin-coverage-calculator

## How to calculate epoxy coverage

Epoxy coverage is calculated using a straightforward volume formula.

**Step 1: Calculate area**
```
Area (sq ft) = Length (ft) x Width (ft)
```

**Step 2: Convert thickness to feet**
```
Thickness (ft) = Thickness (mils) / 12,000
```
One mil equals one thousandth of an inch. There are 12 inches in a foot, so there are 12,000 mils in a foot.

**Step 3: Calculate volume**
```
Volume (cu ft) = Area (sq ft) x Thickness (ft)
```

**Step 4: Convert to gallons**
```
Gallons = Volume (cu ft) x 7.48052
```
There are 7.48052 US gallons in one cubic foot.

**Step 5: Add waste factor**
```
Total Gallons = Base Gallons x (1 + Waste Factor / 100)
```
A waste factor of 10 to 20 percent accounts for product left in mixing containers, application tools, drips, and surface absorption.

## Coverage by application type

Different epoxy applications call for different thicknesses and products.

**Floor Coatings (4 to 100 mils)**
Floor coatings are the thinnest application. A single decorative seal coat might be 4 to 6 mils, while a heavy-duty industrial floor system with base coat and topcoat might total 20 to 30 mils. At 10 mils, one gallon covers roughly 150 square feet — but this varies by product.

**Countertops (approximately 125 mils / 1/8 inch)**
Countertop epoxy is poured thicker to create a self-leveling, durable surface. A standard countertop coat is about 1/8 inch thick. At this thickness, coverage drops significantly — one gallon covers only about 12 to 15 square feet.

**Table Tops (approximately 125 mils / 1/8 inch)**
Table top applications are similar to countertops. The epoxy floods the surface and self-levels. Coverage is similar to countertops: roughly 12 to 15 square feet per gallon.

**Bar Tops (approximately 93 mils / 3/32 inch)**
Bar top coatings sit between countertop and floor thicknesses. Coverage is slightly better than a full countertop coat — around 15 to 20 square feet per gallon depending on the product.

**Deep Pour / Casting (1/4 inch to 2 inches)**
Deep pour epoxy is used for river tables, embedments, and artistic castings. At 1 inch thick, one gallon covers only about 18 square feet. At 2 inches, just 9 square feet. Deep pours often require multiple gallons even for small projects.

## How to use

1. Select your application type from the dropdown. This sets a default thickness appropriate for that project type.
2. Enter the length and width of your project area in feet. For irregular shapes, break the area into rectangles and calculate each separately, then add the results.
3. Adjust the thickness slider if your project calls for a different depth than the default. The current thickness is shown in both mils and inches.
4. Set the waste factor. Use 10 to 15 percent for simple rectangular areas. Use 20 to 30 percent for areas with lots of edges, curves, inlays, or obstacles.
5. Read your results. The hero card shows total gallons needed including waste. The grid below breaks down the area, thickness, base volume, waste buffer, total quarts, and the number of 1-gallon kits to purchase.

## FAQs

**Q:** How many gallons of epoxy do I need for a 100 sq ft floor at 10 mils? 

**A:** At 10 mils thick, 100 square feet requires about 0.62 gallons of epoxy. With a 15% waste factor, you should buy approximately 0.72 gallons — so a single 1-gallon kit will be enough.


**Q:** Why do I need a waste factor? 

**A:** Epoxy left in mixing buckets, on stir sticks, and in rollers or brushes cannot be recovered. Surface absorption and leveling behavior also mean not every drop ends up at the final thickness. A 10 to 20 percent buffer prevents running out before the job is done.


**Q:** Can I use this calculator for circular tables? 

**A:** For a circular surface, calculate the area using the formula: Area = pi x radius squared (3.14159 x r x r). Then use that area as if it were a rectangular surface when interpreting the results, or simply enter equivalent dimensions. For example, a 4-foot diameter circle has an area of about 12.6 sq ft.


**Q:** What is a "mil" in epoxy thickness? 

**A:** One mil is one thousandth of an inch (0.001"). Floor coatings are commonly specified in mils because the thicknesses are so small. A 10-mil floor coat is 0.01 inches thick. Countertop and casting pours are often described in fractions of an inch instead.


**Q:** How do I measure the thickness I need? 

**A:** Check the manufacturer's data sheet for your specific epoxy product. Most products list a recommended spreading rate in square feet per gallon or a recommended film thickness. You can work backwards from square feet per gallon to find the effective thickness in mils.


**Q:** What happens if I mix too little and run out mid-pour? 

**A:** Running out of epoxy during a pour can cause visible seam lines, uneven surfaces, or adhesion failures between cure layers. It is always better to have a small amount of leftover product than to run short. Use the waste factor slider to build in a safety buffer.

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