How much epoxy to coat a bathroom vanity top?
You need about 0.85 gallons of tabletop epoxy for one 1/8 inch flood coat on a 5 ft × 22 in bathroom vanity top — 9.17 square feet of top plus a 1.5 in front edge and a 4 in backsplash, 11.5 square feet in all — with 6.56 fl oz of edge drips and 5% for the bucket included.
How to work it out
- counter 5 ft × 22 in = 9.17 sq ft + edge 5 ft × 1.5 in = 0.63 sq ft + splash 5 ft × 4 in = 1.67 sq ft = 11.5 sq ft
- Flood: 9.17 sq ft × 1/8 in × 1 = 0.71 gal; edge film 0.63 sq ft × 1/32 in × 1 = 1.56 fl oz; backsplash film 1.67 sq ft × 1/32 in = 4.16 fl oz
- Edge drips: 5 ft at 1.25 fl oz per foot of edge per 1/8 in coat × 1 = 6.25 fl oz
- 0.81 gal + 5% waste = 0.85 gal
- Total 0.85 gal → 1 × 1 gal kit
- Mix ratio 1 : 1 by volume, SG A 1.15 / B 0.95 (typical, not published by the maker — type your data sheet’s SGs for exact weights) → Part A 0.42 gal (4.07 lb) + Part B 0.42 gal (3.36 lb)
A vanity is a manageable first countertop project: small enough to pour in one go, big enough to learn how the coating behaves on an edge. The sink cut-out and faucet holes are the fiddly part — tape or plug them, and expect some epoxy to run toward the bowl opening.
Adjust for your project
More options: waste · ratio · SG A …
- Kits to buy
- 1 kit
- Flood coat(s), incl. edge and backsplash film
- 0.8 gal (3.19 qt · 3.02 L)
- Edge drips (runs off and is lost)
- 6.56 fl oz (0.21 qt · 0.19 L)
- Total area coated
- 11.5 sq ft
- Countertop surface
- 9.17 sq ft
- Base + flood coats per sq ft of top (before drips and waste)
- 10 fl oz per sq ft
- Batches to mix
- 1 batch
- Per batch (volume, then weight)
- A 1.7 qt (4.07 lb) + B 1.7 qt (3.36 lb)
- When mixing — Part A (resin)
- 0.42 gal (1.7 qt · 1.61 L)
- When mixing — Part B (hardener)
- 0.42 gal (1.7 qt · 1.61 L)
- Part A by weight
- 4.07 lb (65.1 oz · 1.85 kg)
- Part B by weight
- 3.36 lb (53.8 oz · 1.53 kg)
- Left over from the last kit
- 0.15 gal (0.61 qt · 0.57 L)
- What to buy: 1 × 1 gal tabletop epoxy kit. Each kit has both bottles (resin + hardener) — you don’t buy them separately. Looking at a different kit size? Change Kit size above.
Epoxy for a 5 ft vanity by backsplash height (one 1/8 in flood coat, 1 gal kits)
| Backsplash | Total area coated | Tabletop epoxy to buy | Kits to buy |
|---|---|---|---|
| No backsplash | 9.79 sq ft | 0.81 gal | 1 kit |
| 4 in backsplash | 11.5 sq ft | 0.85 gal | 1 kit |
| 6 in backsplash | 12.3 sq ft | 0.87 gal | 1 kit |
What to know about a 5 ft bathroom vanity top
One 1-gallon kit covers this top with about 0.15 gallons — roughly 19 fl oz — to spare. That is enough for a heavy hand on the front edge, but check before you add a seal coat: on a bare plywood or MDF vanity a closed-grain seal coat over the top, edge and backsplash is about 12 fl oz, which takes the job to 0.94 gallons. That is still one kit, but a tight fit, so a small top-up kit is cheap insurance for a first pour.
Most vanity tops are about 21–22 in deep, and 5 ft is a common double-sink width. With two basins, there are two cut-outs to tape and two sets of faucet holes to plug, so allow more time for masking than for pouring. Subtracting the cut-outs saves little resin, because what you pour near them runs into the openings anyway.
Bathrooms are small, closed rooms. Keep the door open and an exhaust fan or window fan running while the coating cures; the EPA recommends extra ventilation when you use products that give off VOCs, and the fumes build up quickly in a room this size.
This page also shows why the unit toggle matters: in metric the 1/8 in coat is 3.175 mm, and the calculator keeps that exact thickness rather than rounding to 3 mm, which would trim about 5% off the flood coat and the drips.
For a full kitchen, see How much epoxy for 30 sq ft of countertop; for an island that drips on every side, How much epoxy to coat a kitchen island.
Different size? Use the full Countertop Epoxy Calculator.
What you’ll need
- Countertop epoxy kitPremium price
Coating epoxy sold for base and flood coats on counters, often with matching pigments. Check the coverage the maker assumes per coat.
See options on Amazon (opens in a new tab) - Graduated mixing cups & stir sticksBudget price
Small cups marked in ounces and ml for art, coasters and tumblers. Use a fresh cup when you transfer to a second container.
See options on Amazon (opens in a new tab) - Nitrile glovesBudget price
Keep uncured resin off your skin. Repeated skin contact is how many people become sensitized to epoxy.
See options on Amazon (opens in a new tab)
As an Amazon Associate we earn from qualifying purchases. Links to products are affiliate links — they cost you nothing extra and help keep these calculators free.
Frequently asked questions
How much epoxy for a 5 ft vanity top without a backsplash?
About 0.81 gallons for one 1/8 in flood coat on the top and front edge (9.79 square feet) — 1 kit of 1 gallon.
How much epoxy for a 4 ft bathroom vanity top?
About 0.68 gallons for one 1/8 in flood coat on a 4 ft × 22 in top with edge and backsplash (9.17 square feet) — 1 kit of 1 gallon.
How much epoxy for a 5 ft plywood vanity top with a seal coat?
About 0.94 gallons: 12 fl oz for the seal coat, then the 1/8 in flood coat — 1 kit of 1 gallon, with only 0.0579 gal spare.
Other common sizes
- How much epoxy for 30 sq ft of countertop — 2.71 gal
- How much epoxy for a 50 sq ft kitchen countertop — 4.55 gal
- How much epoxy to coat a kitchen island — 2.59 gal
Sources
- TotalBoat — TableTop Epoxy product page (opens in a new tab) — A 1-gallon kit covers 12.8 sq ft at 1/8 in; maximum 1/4 in per coat; seal-coat porous surfaces first.
- WEST SYSTEM — Epoxy Safety (PDF) (opens in a new tab) — Skin contact and sensitization; gloves and ventilation.
- 21 CFR 175.300 — Resinous and polymeric coatings (Cornell LII) (opens in a new tab) — US rule for coatings intended for repeated food contact.