Tile Calculator —
Estimate Tiles, Grout & Cost
in Seconds
Stop guessing and avoid costly over-orders or short supplies. Our tile calculator instantly estimates tile quantity, boxes needed, waste-adjusted amounts, and total installation cost for floor, wall, bathroom, and backsplash tiles.
Professional Tile Calculator
Calculate tile quantity, boxes, waste, grout, and total installation cost for any room or surface type.
How Tile Calculations Work
Our calculator uses industry-standard tile estimation formulas trusted by professional tile installers.
To calculate how many tiles you need: Multiply your room's length by its width to find the total square footage. Divide by the area of one tile (in square feet). Then multiply by your waste factor (1.10 for 10%, 1.15 for 15%, etc.) to get the final tile count. Round up to the nearest whole tile.
Measure Room
Measure room length and width in feet. Multiply for total square footage.
Calculate Tile Area
Convert tile dimensions to feet, then multiply length × width per tile.
Divide Areas
Divide total room area by single tile area to get base tile count.
Add Waste Factor
Multiply by 1.10–1.20 depending on pattern complexity and tile type.
Calculate Boxes
Divide total tiles by tiles per box, always rounding up to full boxes.
Tile Installation Guide
Compare tile types, sizes, and patterns to choose the right tile for your project.
Ceramic vs. Porcelain Tile
Which tile type is right for your project?
| Feature | Ceramic | Porcelain |
|---|---|---|
| Water Resistance | Moderate | Excellent |
| Durability | Good | Very High |
| Cost | $1–$5/sqft | $3–$10/sqft |
| Weight | Lighter | Heavier |
| Cutting Ease | Easy | Harder |
| Outdoor Use | Not recommended | Yes |
| Recommended Use | Indoor walls/floors | High-traffic/wet areas |
| Waste Allowance | 10–12% | 10–15% |
Common Tile Sizes & Coverage
Tiles per square foot by size
| Tile Size | Tiles / Sq Ft | Sq Ft / Tile | Best For |
|---|---|---|---|
| 4×4 in | 9.0 | 0.11 | Backsplash |
| 6×6 in | 4.0 | 0.25 | Bathroom wall |
| 12×12 in | 1.0 | 1.00 | Standard floors |
| 12×24 in | 0.5 | 2.00 | Modern floors |
| 18×18 in | 0.44 | 2.25 | Large rooms |
| 24×24 in | 0.25 | 4.00 | Open plan |
| 24×48 in | 0.125 | 8.00 | Large format |
| 48×48 in | 0.0625 | 16.00 | Commercial |
Grout Spacing Recommendations
Optimal grout joint width by tile type
| Tile Type | Joint Width | Grout Type |
|---|---|---|
| Rectified porcelain | 1/16" | Unsanded |
| Standard ceramic | 1/8" | Unsanded |
| Floor tile 12×12 | 3/16" | Sanded |
| Large format 18"+ | 1/4" | Sanded |
| Natural stone | 1/8"–3/8" | Sanded |
| Glass mosaic | 1/16"–1/8" | Unsanded |
| Outdoor / paver | 3/8"–1/2" | Sanded |
Tile Installation Cost Guide
Average labor and material costs by project type
| Project Type | Material | Labor | Total/Sqft |
|---|---|---|---|
| Ceramic floor | $1–$5 | $5–$8 | $6–$13 |
| Porcelain floor | $3–$10 | $6–$10 | $9–$20 |
| Natural stone | $5–$20 | $8–$15 | $13–$35 |
| Bathroom wall | $2–$8 | $7–$12 | $9–$20 |
| Kitchen backsplash | $3–$12 | $8–$14 | $11–$26 |
| Shower surround | $4–$15 | $10–$18 | $14–$33 |
| Outdoor patio | $3–$10 | $7–$14 | $10–$24 |
Tile Layout Patterns & Waste Factors
Your pattern choice affects how much tile you need to order.
Straight Lay
Tiles aligned in a simple grid. Minimal cuts, lowest waste.
+10% wasteOffset / Running Bond
Each row offset by 50%. Common for subway tiles.
+10–12% wasteDiagonal 45°
Tiles set at 45° angle. Creates visual space but wastes more material.
+15–20% wasteHerringbone
Interlocking V-pattern. Stylish and popular for backsplash.
+15% wasteCommon Tile Estimation Mistakes
Most homeowners make at least one of these errors. Here's how to avoid running short — or ordering too much.
Forgetting the Waste Factor
Ordering the exact number of tiles for the room area is the most common mistake. You will always have cuts, broken tiles, and future repair needs.
Always add at least 10% waste. Use 15% for standard rooms, 20% for diagonal patterns or natural stone.
Wrong Unit Conversions
Mixing inches and feet is surprisingly common. Dividing a 12×12 room (144 sq ft) by 12×12 tile (1 sq ft) without converting leads to massive errors.
Always work in the same units. Convert tile dimensions to feet: 12 inches = 1 foot, 18 inches = 1.5 feet.
Ignoring Grout Spacing
Grout joints add up. A 1/8" gap on a 12×12 tile reduces effective tile coverage by about 2%, which compounds over large areas.
Use the effective tile size when calculating: subtract grout joint width from each tile dimension before measuring area.
Rounding Down on Boxes
Always round box quantities up, never down. If you need 11.2 boxes, buy 12. Returning unused tiles is far easier than running short mid-install.
Use CEILING() logic — always round up to the next full box. Never split boxes in your calculations.
Not Buying from the Same Dye Lot
Tiles from different production batches can have subtle color variations. Ordering extra tiles later from a new dye lot may result in visible mismatches.
Buy all your tiles at once from the same dye lot. Always check the lot number on each box before purchasing.
Not Accounting for Niche & Cutout Areas
Subtracting the exact area of doors, windows, or kitchen islands seems right, but those areas still require cut tile edges and waste.
Only deduct 50–70% of obstacle areas from your total. Edge cuts from those openings still consume tiles.
Tile Calculator FAQs
The most common tile calculation questions answered clearly and directly.
How many tiles do I need for my room? ▾
How much extra tile should I order? ▾
What is the formula for calculating tiles? ▾
How many square feet does a 12×12 tile cover? ▾
What waste percentage should I use for floor tiles? ▾
How do I calculate tiles for a bathroom floor? ▾
How many boxes of tile do I need? ▾
How do I calculate grout for tile? ▾
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Tile Project?
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