Tile Calculator
Use this free tile calculator to instantly calculate how many tiles you need for any floor, wall, backsplash, or shower. Enter your area dimensions, select your tile size (or enter a custom size), choose your grout joint width and waste factor, and get an instant tile count and material cost estimate.
Tiles Needed = (Area × Waste Factor) ÷ Tile Size (sq ft)
Always round up to nearest whole tile
Always add 10–15% for waste · Diagonal layouts need 15–20% extra · Buy from same lot number to avoid color variation
Cost estimates based on 2026 US average tile prices. Always confirm current pricing with your tile supplier.
How Does the Tile Calculator Work?
This tile calculator estimates the number of tiles needed for any floor or wall area based on your room dimensions, tile size, grout joint, layout pattern, and waste factor. It works for floors, walls, backsplashes, showers, and any other tiled surface.
How to Use:
- Enter your area length and width in feet. For irregular shapes, divide into rectangles and add them together using our Square Footage Calculator.
- Select your tile size — choose from common sizes or enter a custom size in inches.
- Select your grout joint size — this affects how many tiles fit per square foot.
- Choose your waste factor — 10% for straight layouts, 15–20% for diagonal or complex patterns.
- Select your tile type for an instant material cost estimate.
Every tile job produces waste from cuts, breakage, and pattern matching. A 10% waste factor means for every 100 sq ft of floor, you buy 110 sq ft of tile. For diagonal layouts, always use 15–20% — diagonal cuts waste significantly more material. Running short on tile mid-job and ordering more from a different batch can result in visible color differences.
Common Tile Sizes Guide
Tile size dramatically affects the look of a room. Larger tiles make small rooms feel bigger. Smaller tiles suit curved surfaces and detailed patterns. Here's a guide to the most common sizes and their best applications.
| Tile Size | Sq Ft per Tile | Best For | Notes |
|---|---|---|---|
| 4×4 in | 0.11 | Backsplash, shower walls | Classic, easy to cut |
| 6×6 in | 0.25 | Bathroom floors, shower floors | Good for curved areas |
| 12×12 in | 1.00 | Kitchen & bathroom floors | Most popular size overall |
| 18×18 in | 2.25 | Living rooms, open plan floors | Fewer grout lines, easier upkeep |
| 24×24 in | 4.00 | Large living areas, commercial | Modern look, needs flat subfloor |
| 12×24 in | 2.00 | Bathrooms, showers, modern homes | Trendy plank look |
| 3×12 in (subway) | 0.25 | Backsplash, shower walls | Timeless classic |
| Mosaic (1×1 or 2×2) | varies | Shower floors, accents | Sold by sq ft on mesh sheets |
Large format tiles (24×24 inches and bigger) require a very flat and rigid subfloor — typically ¼ inch variation over 10 feet maximum. They also require large-format tile adhesive and back-buttering technique. The reward is fewer grout lines and a more luxurious, seamless appearance.
Tile Types Guide
Choosing the right tile type for each application is as important as the size. Using the wrong tile can result in cracking, slipping, staining, or failure within a few years.
| Type | Cost/Sq Ft | Durability | Best For | Avoid |
|---|---|---|---|---|
| Ceramic | $0.50 – $5 | Good | Wall tiles, light traffic floors | Outdoor, heavy traffic |
| Porcelain | $3 – $10 | Excellent | Floors, showers, outdoor | — |
| Natural Stone | $5 – $20+ | Varies | Luxury bathrooms, feature walls | High-acid areas |
| Travertine | $4 – $12 | Good | Floors, bathrooms, pool areas | Acidic cleaners |
| Slate | $4 – $14 | Very Good | Floors, outdoor, entryways | Showers (sealing needed) |
| Mosaic / Glass | $8 – $30 | Good (walls) | Backsplash, shower accents | Floor traffic areas |
| Cement / Encaustic | $6 – $20 | Good | Decorative floors, patios | Wet areas (sealing needed) |
Porcelain is fired at higher temperatures making it denser, harder, and less porous than ceramic. Porcelain is suitable for floors, showers, outdoor areas, and freeze-thaw climates. Ceramic is better suited for walls and light-traffic floors where budget is a priority. For any wet area or floor, choose porcelain with a PEI rating of 3 or higher.
Grout Calculator & Guide
Grout fills the joints between tiles and is critical for waterproofing, aesthetics, and structural integrity. Here's how to estimate grout and choose the right type.
| Tile Size | Joint Size | Grout Needed | Grout Type |
|---|---|---|---|
| 4×4 in | ⅛ inch | ~1.5 lbs/sq ft | Sanded grout |
| 12×12 in | ⅛ inch | ~0.5 lbs/sq ft | Unsanded grout |
| 18×18 in | 3/16 inch | ~0.4 lbs/sq ft | Sanded grout |
| 24×24 in | ¼ inch | ~0.35 lbs/sq ft | Sanded grout |
| Mosaic 1×1 in | 1/16 inch | ~3 lbs/sq ft | Unsanded grout |
Grout Types:
- Unsanded grout — for joints under ⅛ inch. Used with polished stone and glass tiles where sanded grout would scratch the surface.
- Sanded grout — for joints ⅛ inch and wider. The sand adds bulk and strength to prevent cracking in wider joints.
- Epoxy grout — stain-proof, waterproof, chemical resistant. Best for kitchens, commercial, and shower floors. More expensive and harder to work with.
- Furan grout — industrial use only. Highly chemical resistant.
Always seal cementitious grout (sanded and unsanded) after it cures — typically 72 hours after installation. Epoxy grout does not need sealing. Re-seal grout annually in showers and every 2–3 years on floors. Unsealed grout stains easily and allows water penetration behind tiles.
Tile Cost by Type (2026)
Here's a full cost breakdown for tiling a standard 100 sq ft bathroom floor with different tile types in 2026.
| Tile Type | Material/Sq Ft | 100 Sq Ft Materials | Installed Cost |
|---|---|---|---|
| Ceramic (12×12) | $0.50 – $5 | $55 – $550 | $700 – $1,500 |
| Porcelain (12×12) | $3 – $10 | $330 – $1,100 | $1,000 – $2,500 |
| Natural Stone | $5 – $20+ | $550 – $2,200+ | $1,500 – $4,500 |
| Travertine | $4 – $12 | $440 – $1,320 | $1,200 – $3,000 |
| Mosaic / Glass | $8 – $30 | $880 – $3,300 | $1,800 – $5,500 |
| Labor only | — | — | $4 – $14/sq ft |
*Based on 100 sq ft with 10% waste, standard ⅛" grout joints. Labor rates vary significantly by region. Complex patterns, diagonal layouts, and heated floor installation add $2–$5/sq ft in labor.
Example Calculation
You want to tile a 12×10 ft bathroom floor with 12×12 inch porcelain tiles in a straight lay pattern with 10% waste.
12 × 10 = 120 sq ft
Step 2 — Add 10% waste:120 × 1.10 = 132 sq ft
Step 3 — Each 12×12 tile = 1 sq ft:132 ÷ 1 = 132 tiles needed
Step 4 — Material cost (porcelain at $5/sq ft average):132 × $5 = ~$660 in materials
Step 5 — Installed cost (labor at $7/sq ft):120 × $7 = $840 labor + $660 materials = ~$1,500 total installed
Grout needed (0.5 lbs/sq ft for 12×12 with ⅛" joints):132 × 0.5 = 66 lbs of grout (about 4–5 bags of 20 lb grout)
Buying & Layout Tips
Before You Buy
- Buy from the same lot number — tile color and shade varies between production lots. Buy all tiles needed for the project from the same lot. You can usually order more from the same lot within 6–12 months — ask your supplier about lot availability.
- Order all materials at once — tile, grout, adhesive/thinset, and grout sealer. Running back to the store mid-project is a common cause of delays.
- Check for PEI rating on floor tiles — PEI 1–2 for walls only, PEI 3 for light residential floors, PEI 4 for heavy residential and commercial, PEI 5 for commercial heavy traffic.
- Acclimate tile — store tiles in the room where they'll be installed for 24–48 hours before laying, especially for natural stone.
Layout Tips
- Find the center of the room first — snap chalk lines from the midpoint of opposite walls to find the center point. Start laying from the center outward so cut tiles are equal on both sides.
- Dry lay first — lay out tiles dry (no adhesive) from center to walls to check your layout before committing. Adjust center point if cuts are less than half a tile wide.
- Use tile spacers — spacers ensure consistent joint width throughout the installation. Remove spacers before grout cures.
- Back-butter large format tiles — for tiles 15 inches or larger, apply thinset to both the floor and the back of the tile for full coverage.
Diagonal (45°) tile layouts create a more dynamic look but waste 15–20% more tile due to the angled cuts at every wall. Always use at least 15% waste factor for diagonal layouts and expect more cuts to make. Use our calculator with 15–20% waste selected for diagonal projects.