Grout Sealer Calculator
Enter area, sealer product, and number of coats to see how many quarts to buy. Coverage rates from manufacturer specifications: Aqua Mix ~375 sq ft/qt, Miracle 511 ~1000 sq ft/qt.
Area & Product
How the sealer formula works
Quarts needed
quarts = ⌈ area × coats × (1 + waste/100) / coverage_per_qt − 1e−9 ⌉ Coverage rates are from manufacturer labels: Aqua Mix Sealer's Choice Gold ~375 sq ft/qt on polished surfaces, up to 500 sq ft on smooth sealed tile. Miracle 511 Impregnator ~1000 sq ft/qt on dense tile; porous stone and grout-only sealing can use 3–4× more.
When to seal grout
Seal cement-based grout after it has fully cured — at least 72 hours after application, and only once the grout has dried to its final colour. Applying sealer too early traps moisture in the joint and prevents proper curing. If the surface shows any colour variation or feels slightly damp, wait longer.
For shower floors and frequently wet areas, resealing annually is a reasonable starting point. The simplest test: sprinkle a few drops of water on the grout. If the drops bead up and roll off, the sealer is still effective. If the water darkens the grout surface, it is time to reseal.
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Frequently Asked Questions
For Aqua Mix Sealer's Choice Gold (~375 sq ft/qt) at 2 coats with 10% waste: area_needed = 100 × 2 × 1.10 = 220 sq ft; quarts = ⌈220/375⌉ = 1 quart. For Miracle 511 Impregnator (~1000 sq ft/qt) at 2 coats: area_needed = 220 sq ft; quarts = ⌈220/1000⌉ = 1 quart. Coverage varies significantly by tile porosity — porous stone may need twice as much.
Both are penetrating impregnating sealers that soak into the pores of grout and tile without forming a surface film. Aqua Mix Sealer's Choice Gold has a lower coverage rate (~375 sq ft/qt) but provides strong protection on both porous tile and cement grout. Miracle 511 Impregnator covers more ground (~1000 sq ft/qt) and works well on denser tile — it is typically less effective on highly porous grout without a second coat. Both are suitable for grout sealing; check your tile manufacturer's recommendation.
Cement-based grout (sanded and unsanded) is porous and should be sealed to resist staining and moisture penetration. Apply sealer after the grout has fully cured — typically 72 hours for cement grout. Epoxy grout is inherently non-porous and does not require a sealer. Polished marble and natural stone tile often need a separate stone sealer in addition to grout sealer.
The standard recommendation is 2 coats, with 15–30 minutes between coats and a final wipe-down. High-porosity grout (like rough-textured or sanded grout in showers) may benefit from 3 coats. Dense glazed tile in low-traffic areas may seal adequately with 1 coat. Do the water drop test: if water beads, the sealer is working; if it soaks in, apply another coat.
High-traffic areas (floor, shower) typically need resealing every 1–3 years. Low-traffic areas (backsplash) may last 3–5 years. The water drop test is the best guide: if water absorbs rather than beads on the grout surface, it is time to reseal. Scrub the grout clean and let it dry fully before reapplying sealer.