Epoxy is one of the most durable, stunning finishes you can apply to a countertop — but buying the wrong amount is an expensive mistake. The calculation depends on two things: your countertop's surface area and your desired coating thickness. This guide gives you the formula, a quick inline calculator, and a coverage reference table. For a full estimate including mix ratio and cost breakdown, use the floor coating section of the main epoxy calculator and enter your countertop dimensions.
Enter your countertop dimensions for exact epoxy volume, Part A/B breakdown, and total cost — in seconds.
🍽️ Open Epoxy Calculator ⟶| Coat Thickness | fl oz per sq ft | mL per sq ft | Best For |
|---|---|---|---|
| 1/16″ (1.6mm) | 0.62 oz | 18 mL | Thin seal coat over porous wood |
| 1/8″ (3.2mm) | 1.25 oz | 37 mL | Standard countertop flood coat |
| 3/16″ (4.8mm) | 1.87 oz | 55 mL | Thicker protective coating |
| 1/4″ (6.4mm) | 2.50 oz | 74 mL | Deep pour with embedded objects |
Always add a 10–15% waste buffer to these figures for mixing container loss and drips. First coats on raw wood or concrete typically absorb 20–30% more.
Not all epoxy resins are suitable for countertops. Here's what matters:
Surface preparation: Sand wood to 120–220 grit. Degrease with isopropyl alcohol. Fill any cracks with epoxy filler before your main pour. For laminate, sand to 220 grit to create mechanical adhesion — epoxy won't bond to glossy laminate without sanding.
Seal coat first: Apply a thin (1/16″) seal coat to any porous surface (wood, concrete, porous laminate). Brush it in thoroughly, let it gel to a tacky state (4–8 hours at 75°F), then pour the flood coat. This prevents outgassing bubbles from ruining the finish coat.
Temperature control: Work between 70–80°F. Cold epoxy thickens and won't self-level; warm epoxy cures too fast. Warm your Part A and Part B containers in warm water for 10 minutes if your shop is cool.
Bubble removal: After pouring, pass a propane torch or heat gun 2–3 inches above the surface in slow sweeping motions. The heat pops surface bubbles. Do this 5–10 minutes after pouring and again 20 minutes later. Don't hold the torch in one spot — you'll scorch the epoxy.
For a standard 1/8-inch flood coat: multiply square footage by 1.25 fl oz. A 10 sq ft surface = 12.5 fl oz net. Add 15% buffer = 14.4 fl oz total. For two coats: multiply by 2 (28.8 fl oz). Use the calculator above for your exact dimensions.
A self-leveling flood coat is typically 1/8 inch (3mm) per application — enough for a durable, glassy finish. If you want a dramatic thick pour with embedded objects, use 1/4 to 3/8 inch in multiple layers. Never pour more than 1/4″ of standard epoxy in a single coat — use deep-pour resin for thicker applications.
Yes, for porous substrates like raw wood, reclaimed wood, and unsealed concrete. A thin seal coat (brushed on) fills pores and prevents outgassing bubbles from erupting through your flood coat. Apply seal coat, wait until it's tacky but not fully cured (4–8 hours), then apply the flood coat for a chemical bond between layers.
For kitchen countertops: choose a food-safe, UV-resistant, 1:1 tabletop epoxy. Popular options include TotalBoat TableTop Epoxy, ProMarine Supplies Table Top & Bar Top Epoxy, and Stone Coat Countertop Epoxy. Avoid general-purpose laminating epoxies — they're too thick and aren't designed for the self-leveling finish a countertop requires.
Most countertop epoxies are light-use ready in 24–48 hours (you can set light items on them). They reach full hardness in 5–7 days. During those 7 days: avoid hot pots, don't cut directly on the surface, and keep it dry. After 7 days, use trivets for pots and cutting boards for knives — epoxy is durable but not indestructible.