Easy Epoxy Calc

How much epoxy for a 50 sq ft kitchen countertop?

Short answer

You need about 4.55 gallons of tabletop epoxy for one 1/8 inch flood coat on a 50 square foot kitchen countertop — a 23.5 ft run at 25.5 in deep plus 24 ft of 1.5 in edge and a 4 in backsplash, 60.8 square feet in all — with 31.5 fl oz of edge drips and 5% for the bucket included.

How to work it out

  1. counter 23.5 ft × 25.5 in = 49.9 sq ft + edge 24 ft × 1.5 in = 3 sq ft + splash 23.5 ft × 4 in = 7.83 sq ft = 60.8 sq ft
  2. Flood: 49.9 sq ft × 1/8 in × 1 = 3.89 gal; edge film 3 sq ft × 1/32 in × 1 = 7.48 fl oz; backsplash film 7.83 sq ft × 1/32 in = 19.5 fl oz
  3. Edge drips: 24 ft at 1.25 fl oz per foot of edge per 1/8 in coat × 1 = 30 fl oz
  4. 4.34 gal + 5% waste = 4.55 gal
  5. Total 4.55 gal → 5 × 1 gal kits
  6. 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 2.28 gal (21.9 lb) + Part B 2.28 gal (18.1 lb)

Fifty square feet is a mid-size L- or U-shaped kitchen. At this size the job is less about the gallons than about getting them on in time: one person can’t spread this much before a coating epoxy starts to thicken, so plan on sections or a helper. If your system uses a base coat plus a flood coat, add the base coat in the calculator.

Adjust for your project

ft
Add up all the straight runs. Don’t count a corner twice.
in
Wall to front edge. Standard is 25–26 in.
ft
Front edges plus open ends — the edges the resin runs over and drips from. Edges against a wall don’t count.
in
How tall the front edge is — usually the thickness of the top.
in
0 if you’re not coating one. It gets a thin brushed or rolled coat, not a flood coat.
ft
Bare wood (butcher block, plywood, MDF) needs a thin first coat so air in the grain doesn’t bubble up. Over laminate or an old sealed top, pick No and use whatever primer your kit calls for.
Only if your countertop kit uses a colored coat rolled on under the clear flood coat. Its instructions give the thickness or fl oz per sq ft.
1 is normal. Some veined or metallic looks use 2.
gal
Total of both bottles together. Most “1 gallon kits” are ½ gal resin + ½ gal hardener — enter 1. If the listing says 1 gal of EACH, enter 2.
More options: waste · ratio · SG A …
%
What stays in the bucket and on the spreader. Edge drips are counted separately.
Only changes the Part A / Part B split — it’s printed on the kit. Tabletop and art resins are usually 1:1; deep pour often 2:1.
From the TDS, in g/ml. Leave blank for 1.15 (typical, not published by the maker).
From the TDS, in g/ml. Leave blank for 0.95 on 1:1 kits or 0.97 on other ratios (typical, not published by the maker).
gal
Resin + hardener mixed in one bucket. Big batches heat up and thicken sooner, so pros mix the next one while the last is being poured.
$
Optional — your kit price, for a cost estimate
Tabletop epoxy to buy4.55 gal18.2 qt · 17.2 L
Kits to buy
5 kits
Flood coat(s), incl. edge and backsplash film
4.31 gal (17.2 qt · 16.3 L)
Edge drips (runs off and is lost)
31.5 fl oz (0.98 qt · 0.93 L)
Total area coated
60.8 sq ft
Countertop surface
49.9 sq ft
Base + flood coats per sq ft of top (before drips and waste)
10 fl oz per sq ft
Batches to mix
5 batches
Per batch (volume, then weight)
A 1.82 qt (4.37 lb) + B 1.82 qt (3.61 lb)
When mixing — Part A (resin)
2.28 gal (9.11 qt · 8.62 L)
When mixing — Part B (hardener)
2.28 gal (9.11 qt · 8.62 L)
Part A by weight
21.9 lb (350 oz · 9.91 kg)
Part B by weight
18.1 lb (289 oz · 8.19 kg)
Left over from the last kit
0.45 gal (1.79 qt · 1.69 L)
  • What to buy: 5 × 1 gal tabletop epoxy kits. Each kit has both bottles (resin + hardener) — you don’t buy them separately. Looking at a different kit size? Change Kit size above.
  • At this size most people coat in sections (split at a seam or corner) or work with a helper mixing while another pours — one person can’t spread this much inside a coating epoxy’s working time.

For this job · affiliate link
Countertop epoxy kitAt 60.8 sq ft you’ll pour in sections, so buy all 5 kits from one batch — color and working time then match from section to section.
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Kits and leftover for a 50 sq ft kitchen by kit size (one 1/8 in flood coat)

Kits and leftover for a 50 sq ft kitchen by kit size (one 1/8 in flood coat)
Kit sizeKits to buyLeft over from the last kit
1 gal kits5 kits0.45 gal
1.5 gal kits4 kits1.45 gal
2 gal kits3 kits1.45 gal
3 gal kits2 kits1.45 gal

What to know about a 50 sq ft kitchen countertop

Measure an L or U without counting the corners twice. Take the first leg to the wall, then measure the next leg from the front edge of the first; if you measure both legs along the wall, you count the corner square — about 4.5 sq ft at this depth — twice. The 23.5 ft run here is the total after doing that.

Five 1-gallon kits leave about 0.45 gallons spare. Two 3-gallon kits leave 1.45 gallons — more than a single coat needs, but about right if the kitchen is bare wood and needs a seal coat, or if you split the job and want the second session’s batches to come from the same kit. With the big kits, still measure out and mix one or two gallons at a time: a full bucket of mixed epoxy heats up and loses working time far faster than the same amount spread on a counter.

The 24 ft of edge is where a kitchen this size loses resin. About 30 fl oz — close to a quart — runs off the front edges and drips, and the edge and backsplash films take roughly another 27 fl oz. Tape the underside of every exposed edge and paper the cabinet doors below.

Most people split a kitchen this size into two sessions — one leg one day, the other the next — with the break at the sink or a corner. Tape a clean edge where the first section stops, and follow the kit’s recoat instructions for joining the second section to cured epoxy, which usually means sanding the join.

A smaller single-wall kitchen is worked through in How much epoxy for 30 sq ft of countertop, and a freestanding island in How much epoxy to coat a kitchen island.

Different size? Use the full Countertop Epoxy Calculator.

What you’ll need

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Frequently asked questions

How many 3-gallon epoxy kits for a 50 sq ft kitchen countertop?

2 kits: one 1/8 in flood coat needs 4.55 gallons with drips and 5% waste, leaving 1.45 gallons over.

How much epoxy for two flood coats on a 50 sq ft kitchen countertop?

About 8.95 gallons for two 1/8 in flood coats, drips included — 9 kits of 1 gallon.

How much epoxy for a 50 sq ft kitchen countertop at 1/16 in?

About 2.39 gallons for one 1/16 in coat over 60.8 square feet, drips and 5% waste included — though most self-levelling epoxies won’t level that thin.

Other common sizes

Sources