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Tile & Grout Sealer Calculator

Grout is cement, and cement is a sponge. One quart of sealer is the cheapest insurance in the whole tile job — the trick is buying the right amount for your surface, because porous stone drinks four times more than grout lines.

Your surface

Applied with a small brush or wheel to joints only.

Natural stone: 2 minimum. Slate: expect 3.

Sealer to buy

0.3 qt

Coverage per quart
~400 sq ft
Coats
1
24 oz bottles
1
1-quart bottles
1

Buy the next bottle size up — running dry mid-coat leaves a visible tide line.

Do this math on the job site — in the free app

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Tools the pros use for this job

  • Grout Sealer

    AQUA-X 16 Oz. Grout Sealer, Clear Grout and Tile Sealer, Natural Finish, Professional Grade, Indoor & Outdoor, Fast Dry and Long Lasting Protection

    AQUA-X 16 Oz. Grout Sealer, Clear Grout and Tile Sealer, Natural Finish, Professional Grade, Indoor & Outdoor, Fast Dry and Long Lasting Protection

    Check price on Amazon

    The top-rated penetrating sealer for grout and stone.

  • Applicator Kit

    BARWALT Ultra Tile Grouting System, Grout Bucket Kit, Assembled in the USA | Grate and Slotted Sponge Sift Grout, Cuts Grouting Time Nearly in Half, Includes Wall and Floor Sponge, BWT81584

    BARWALT Ultra Tile Grouting System, Grout Bucket Kit, Assembled in the USA | Grate and Slotted Sponge Sift Grout, Cuts Grouting Time Nearly in Half, Includes Wall and Floor Sponge, BWT81584

    Check price on Amazon

    A sealer wheel beats a brush for straight grout lines.

  • Grout Brush

    Sponsored Ad - 2 Pack Grout Scrub Brush with Stiff Bristles | Small Cleaning Brush for Kitchen, Bathroom, Tile Floors, Gaps, Crevices and Window Tracks with Durable Scrubbing Bristles

    Sponsored Ad - 2 Pack Grout Scrub Brush with Stiff Bristles | Small Cleaning Brush for Kitchen, Bathroom, Tile Floors, Gaps, Crevices and Window Tracks with Durable Scrubbing Bristles

    Check price on Amazon

    Sealer over dirty grout seals the dirt in. Scrub first.

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How this calculator works

Sealer coverage depends entirely on porosity. Glazed tile needs none on the face — only the grout. Unglazed and natural stone need the whole surface done, and coverage per quart drops from ~400 sq ft (grout lines only) to ~100 sq ft (slate).

Second coats go further because the surface is already partly sealed — we estimate each extra coat at 75% of the first coat's consumption. Always follow the bottle's own coverage figure when it differs; formulations vary widely.

Frequently asked questions

Does glazed porcelain or ceramic tile need sealing?

No — the glaze is already waterproof. Only the cement grout lines need sealer. The exception is polished porcelain, which has microscopic pores opened by polishing and benefits from one coat.

How soon after grouting can I seal?

Most cement grouts need 48–72 hours to cure before sealing; some fast-setting grouts allow 24 hours. Sealing too early traps moisture and turns grout blotchy. Epoxy grout never needs sealer.

How often should I re-seal?

Test yearly: drip water on the grout. If it beads, you are fine; if it darkens and soaks in, re-seal. Showers typically need it every 1–2 years, floors every 2–3.

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· Reviewed by the Smart Tile Calculator editorial team