How many tiles do I need per square foot?

It depends on tile size. For 12x12 inch tiles, you need 1 tile per sq ft. For 6x6 tiles, you need 4 per sq ft. For 18x18 tiles, you need 0.44 per sq ft. For 24x24 tiles, you need 0.25 per sq ft. Always add 10–15% for waste and cuts.

How much does tile flooring cost installed?

Ceramic tile installed costs $7–$15 per sq ft, porcelain $10–$18/sq ft, and natural stone $15–$30/sq ft. This includes tile, thinset, grout, labor, and basic prep. Complex patterns, heated floors, or membrane systems add $2–$5/sq ft.

How much grout and thinset do I need?

A 25 lb bag of grout covers 50–70 sq ft depending on tile size and joint width. A 50 lb bag of thinset covers 60–80 sq ft with a standard notched trowel. For a 100 sq ft bathroom, plan on 2 bags of grout and 2 bags of thinset.

What size tile is best for a small bathroom?

Larger tiles (12x24 or 12x12) actually make small bathrooms look bigger because there are fewer grout lines. Avoid very large tiles (24x24) in small spaces due to the number of cuts needed. For shower floors, use 2x2 or mosaic tiles for better slope and drainage.

Can I tile over existing tile?

Yes, if the existing tile is firmly bonded, level, and in good condition. Clean thoroughly, sand the surface, and use a polymer-modified thinset. Note that this raises the floor height by 3/8 to 1/2 inch, which may affect door clearances and transitions to adjacent rooms.

Do I need cement board under floor tile?

Cement backer board (1/4 or 1/2 inch) is recommended for all tile installations. It provides a stable, moisture-resistant substrate. Use 1/4-inch cement board over plywood subfloor for floors. In wet areas, a waterproofing membrane over the cement board is essential.

Calculateur Carrelage Gratuit — Pièces & Paquets (2026)

Calculateur de carrelage — outil gratuit pour grès cérame, faïence et pierre naturelle. Nombre de carreaux, paquets, joints et colle à carrelage.

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Comment utiliser ce calculateur

1Measure the room length and width in feet.
2Enter the tile size in inches (e.g., 12 for 12x12 tiles).
3Set waste percentage (10% standard, 15% for diagonal layouts).
4Click Calculate to get tile count, boxes, grout, and thinset estimates.

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À propos de ce matériau

Tile flooring includes ceramic ($1–$5/sq ft), porcelain ($3–$10/sq ft), natural stone ($5–$20/sq ft), and glass mosaic ($10–$30/sq ft). Porcelain is the most popular for floors because of its durability and water resistance — it has a water absorption rate below 0.5%, making it suitable for bathrooms, kitchens, and outdoor applications. Common floor tile sizes are 12x12, 12x24, 18x18, and 24x24 inches. Larger tiles cover faster but require a flatter subfloor (1/8 inch tolerance over 10 feet for tiles over 15 inches). Thinset mortar is the standard adhesive — use modified (polymer-modified) thinset for porcelain and natural stone. Grout comes in sanded (for joints 1/8 inch and wider) and unsanded (for joints under 1/8 inch). Epoxy grout is more expensive but resists staining and does not need sealing. Budget $0.50–$1.50/sq ft for professional thinset and grout materials. Professional tile installation costs $5–$15 per square foot including labor and materials. A 50 lb bag of thinset covers 60–80 sq ft, and a 25 lb bag of grout covers 50–70 sq ft depending on tile size and joint width.

Étapes suivantes :

Flooring Calculator →Carpet Calculator →Laminate Calculator →

Conseils de pose

•Dry-lay tiles before applying thinset to plan cuts and check the layout.
•Use a notched trowel matched to tile size — 1/4x3/8 for 12x12 tiles, 1/2x1/2 for larger.
•Back-butter large-format tiles (over 15 inches) in addition to troweling the floor.
•Use a tile leveling system (clips and wedges) to prevent lippage on large tiles.
•Wait 24 hours after setting tiles before grouting to allow thinset to cure.

Erreurs courantes à éviter

Not using enough thinset — hollow spots under tiles lead to cracking under load.
Skipping waterproofing membrane in wet areas like showers and bathroom floors.
Using unsanded grout in joints wider than 1/8 inch — it will crack.
Not mixing thinset properly — let it slake for 10 minutes, then remix before applying.
Cutting waste too low — complex layouts and diagonal patterns need 15–20% waste.

Calculateur Carrelage Gratuit — Pièces & Paquets (2026)

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