Concrete Sealer Calculator

A concrete sealer calculator returns the gallons of sealer needed for a slab, driveway or patio. It divides the area by a planning coverage rate for the chosen type: 300 sq ft per gallon for acrylic, 200 for epoxy, or 150 for penetrating silane/siloxane. Those rates are placeholders, not manufacturer figures, so use the coverage printed on your product's label. It then multiplies by the coats and rounds up to the nearest tenth of a gallon.

Last reviewed September 2026Method & sources Report an error

Sealer Needed

3.4 gal

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Concrete Sealer4 gallons

Breakdown
Sealer Needed	3.4 gal

How to Calculate Concrete Sealer

Different concrete sealer types have very different coverage rates per gallon. The difference is driven by how thick a film (or how deep a penetration) each type applies. A thin-film acrylic sealer commonly covers around 300 sq ft per gallon. A thicker epoxy coating covers less, around 200 sq ft/gal. A penetrating silane/siloxane sealer soaks into the concrete rather than forming a surface film, and it covers the least, around 150 sq ft/gal. The calculator divides your area by the selected type's coverage rate, multiplies by the number of coats, and rounds up to a partial gallon.

Example: 500 sq ft driveway, using an acrylic sealer (300 sq ft/gal coverage)

A 500 sq ft driveway, using an acrylic sealer (300 sq ft/gal coverage), 2 coats: 1. Coverage per coat: 500 ÷ 300 ≈ 1.67 gal 2. For 2 coats: 1.67 × 2 ≈ 3.33 gal, rounded up to 3.4 gal That driveway needs about 3.4 gallons of acrylic sealer for two coats.

Concrete Sealer: Compare Scenarios

Scenario	Sealer Needed
Small (200 sq ft patio)	1.4 gal
Medium (500 sq ft driveway)	3.4 gal
Large (2,000 sq ft driveway/garage floor)	13.4 gal

What Is Concrete Sealer?

A concrete sealer calculator converts a slab, driveway, or patio's area, sealer type, and number of coats into the gallons of sealer needed. It's useful since coverage rates vary substantially between the common sealer types (acrylic, epoxy, and penetrating). Using one type's coverage figure for another can significantly under- or over-order.

Concrete Sealer: Pros and Cons

Pros

Uses distinct coverage rates for acrylic, epoxy, and penetrating sealers, rather than one blended figure that would misestimate any specific type
Scales directly with number of coats, since a second coat isn't optional for most sealer types and manufacturer recommendations
Rounds up to a partial-gallon figure useful for comparing against quart/gallon container sizes at checkout

Cons

Coverage rates vary by manufacturer and by the concrete surface's porosity. A rougher, more porous surface (common on an older or broom-finished slab) absorbs more sealer than these general figures assume
Doesn't account for surface prep materials (cleaner, etching solution, or a primer some penetrating sealers recommend). Check your specific product's full application instructions
Always confirm your chosen product's own published coverage rate on its label or data sheet rather than relying solely on these general category figures

Concrete Sealer: What a Pro Checks

Wait for new concrete to cure fully, commonly 28 days, before sealing it. Sealing too early can trap moisture that's still leaving the slab.
Match your reseal schedule to your sealer type: acrylic sealers on a driveway with regular traffic typically need resealing every 1 to 3 years, while some penetrating sealers last longer between coats.
Check your specific product's own coverage rate before ordering. A rougher or more porous surface, common on an older or broom-finished slab, absorbs more sealer than these general category figures assume.

Frequently Asked Questions

How much concrete sealer do I need?

It depends heavily on sealer type. A 500 sq ft area needs roughly 3.4 gallons of acrylic sealer for two coats (at ~300 sq ft/gal coverage). A penetrating sealer (~150 sq ft/gal) needs significantly more for the same area and coat count.

What's the difference between acrylic, epoxy, and penetrating concrete sealers?

Acrylic sealers form a thin surface film and are the most common, general-purpose choice, with the highest coverage per gallon. Epoxy coatings form a thicker, more durable film with lower coverage. Penetrating sealers (silane/siloxane) soak into the concrete rather than sitting on top, offering different protection (mainly against water/salt intrusion) with the lowest coverage per gallon of the three.

How many coats of sealer does concrete need?

Most manufacturers recommend at least 2 coats for adequate, even coverage. Check your specific product's data sheet, since some heavier-film products may only need one coat.

Do I need to seal a new concrete driveway right away?

Most sealer manufacturers recommend waiting for the concrete to fully cure first (commonly 28 days for new concrete) before sealing, since sealing too early can trap moisture still leaving the slab.

How often should I reseal a concrete driveway?

It varies by sealer type and exposure. Acrylic sealers on a driveway with regular traffic and weather exposure are commonly resealed every 1-3 years, while some penetrating sealers can last longer between applications. Check your specific product's recommendation.

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