Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
DIY material cost
$1,290
Total gallons needed
8
Primer gallons
2
Base coat gallons
3
Topcoat gallons
3
Flake (lbs)
90.0
Material cost per sq ft
$2.15
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter floor area (sq ft).
- 2Enter primer coverage (sq ft/gal).
- 3Enter base coat coverage (sq ft/gal).
- 4Enter topcoat coverage (sq ft/gal).
- 5Enter average price per gallon ($).
- 6Enter flake broadcast rate (lb/sq ft).
- 7Enter flake price per lb ($).
- 8Enter grinding / etching + supplies ($).
- 9Read your diy material cost on the right — it updates as you type.
- 10Hit Share to keep the scenario or send it to someone.
About this calculator
A standard two-car garage is around 600 square feet, and epoxy coverage is all about mil thickness: the same gallon that covers 300 square feet at 5 mils only covers 150 at 10. A durable system is usually three layers — a penetrating primer, a pigmented base coat with broadcast flake, and a clear polyaspartic or urethane topcoat — and each layer has its own coverage rate. This calculator sizes each layer separately, adds flake by the pound, and totals the material cost so you can compare a DIY kit against a professional install quote, which typically runs $4-$9 per square foot in 2026.
Worked example
Using the values the calculator loads with:
Inputs
- Floor area: 600 sq ft
- Primer coverage: 350 sq ft/gal
- Base coat coverage: 200 sq ft/gal
- Topcoat coverage: 250 sq ft/gal
- Average price per gallon: 85 $
- Flake broadcast rate: 0.15 lb/sq ft
- Flake price per lb: 4 $
- Grinding / etching + supplies: 250 $
Results
- DIY material cost: $1,290
- Total gallons needed: 8
- Primer gallons: 2
- Base coat gallons: 3
- Topcoat gallons: 3
- Flake (lbs): 90
- Material cost per sq ft: $2.15
What each field means
Inputs
- Floor area (sq ft)
- The floor area used in the calculation, measured in sq ft. Starts at 600 sq ft so you have a working example on load. Accepted range: 50–5000 sq ft.
- Primer coverage (sq ft/gal)
- The primer coverage used in the calculation, measured in sq ft/gal. Starts at 350 sq ft/gal so you have a working example on load. Accepted range: 100–600 sq ft/gal.
- Base coat coverage (sq ft/gal)
- The base coat coverage used in the calculation, measured in sq ft/gal. Starts at 200 sq ft/gal so you have a working example on load. Accepted range: 80–400 sq ft/gal.
- Topcoat coverage (sq ft/gal)
- The topcoat coverage used in the calculation, measured in sq ft/gal. Starts at 250 sq ft/gal so you have a working example on load. Accepted range: 100–500 sq ft/gal.
- Average price per gallon ($)
- The average price per gallon used in the calculation, measured in $. Starts at 85 $ so you have a working example on load. Accepted range: 25–250 $.
- Flake broadcast rate (lb/sq ft)
- The flake broadcast rate used in the calculation, measured in lb/sq ft. Starts at 0.15 lb/sq ft so you have a working example on load. Accepted range: 0–0.6 lb/sq ft.
- Flake price per lb ($)
- The flake price per lb used in the calculation, measured in $. Starts at 4 $ so you have a working example on load. Accepted range: 0–15 $.
- Grinding / etching + supplies ($)
- The grinding / etching + supplies used in the calculation, measured in $. Starts at 250 $ so you have a working example on load. Accepted range: 0–2000 $.
Results
- DIY material cost
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total gallons needed
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Primer gallons
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Base coat gallons
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Topcoat gallons
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Flake (lbs)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Material cost per sq ft
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How much epoxy for a two-car garage?
About 3 gallons of base coat, 2 of primer, and 3 of topcoat for 600 square feet at typical coverage rates — roughly 8 gallons total for a full three-layer system.
Do I have to grind the concrete?
Mechanical grinding gives the best bond and is what pros do. Acid etching can work on clean, bare, porous slabs, but it fails on sealed or oil-stained concrete, which is the most common cause of epoxy peeling.
Is a DIY kit as durable as a pro install?
Big-box one-part kits are much thinner than professional 100% solids systems. A high-solids two-part epoxy with a polyaspartic topcoat gets you close to pro durability at roughly half the installed price, if the prep is done right.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). 600 sq ft Garage Floor Epoxy Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/600-sq-ft-garage-floor-epoxy-calculator
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/600-sq-ft-garage-floor-epoxy-calculator" target="_blank" rel="noopener">600 sq ft Garage Floor Epoxy Calculator — RevenueLab</a> (2026).</p>
Source: [600 sq ft Garage Floor Epoxy Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/600-sq-ft-garage-floor-epoxy-calculator) (2026).