Tile & Grout Sealer Calculator
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.
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Tools the pros use for this job
Grout Sealer
The top-rated penetrating sealer for grout and stone.
Applicator Kit
QEP 70005Q-6D 7.5 Inch x 5.5 Inch x 1.875 Inch Grouting, Cleaning and Washing Sponge, X-Large, 6-Pack
$8.97
Check price on AmazonA sealer wheel beats a brush for straight grout lines.
Grout Brush
Holikme 6Pack Drill Brush Power Scrubber Cleaning Brush Extended Long Attachment Set All Purpose Drill Scrub Brushes Kit for Grout, Floor, Tub, Shower, Tile, Bathroom and Kitchen Surface White
$9.99
Check price on AmazonSealer over dirty grout seals the dirt in. Scrub first.
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Prices as of Oct 10, 2026, 6:33 AM UTC. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Choosing a sealer? See our grout sealer buying guide — quarts worked out with this calculator.
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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.
Related calculators
- Grout CalculatorPounds of grout by tile size, joint width, and thickness.
- Shower Tile CalculatorWalls, floor, curb, and niche for a full shower surround.
- Patio & Outdoor Tile CalculatorOutdoor-rated tile, mortar, and drainage gaps for patios.
- Regrout Cost CalculatorRegrouting priced by joint length — pro vs DIY, cement or epoxy.
- Tile Cost EstimatorTotal project cost: tile, grout, mortar, trim, and labor.
- Epoxy CalculatorGallons of epoxy resin for a pour or a floor coat, split by mix ratio.
Guides worth reading next
- How to Seal Grout and Tile (and What Never Needs Sealing)Seal cement grout 48–72 hours after grouting, then every 1–3 years. The water-drop test, penetrating vs topical sealers, and why porcelain needs none.
- Natural Stone vs Porcelain That Looks Like StoneMarble, travertine and slate vs stone-look porcelain: sealing schedules, etching, slip resistance, cost over 10 years, and where each belongs.
- How to Measure a Room for Tile (Step by Step)Measure any room for floor or wall tile: handle closets and alcoves, convert inches to decimals, subtract fixtures, and add the right waste percentage.