Tile Calculator
Calculate how many tiles you need for your floor or wall project. Includes waste factor, grout, and thinset estimates.
Room & Tile Dimensions
Tile Size:
Common: 1/16" (0.0625), 1/8" (0.125), 3/16" (0.1875), 1/4" (0.25)
Tile Pattern:
Pricing:
Tiles Needed
132
12×12" tiles (Straight pattern)
Materials Needed:
Cost Estimate:
Tile Pattern Guide
Straight/Grid
Tiles aligned in rows and columns. Easiest to install with minimal waste.
Diagonal
Tiles set at 45° angle. Makes rooms look larger but requires more cuts.
Brick/Offset
Tiles offset by 1/3 or 1/2. Hides imperfections, works well with plank tiles.
Tiling Tips
- • Always buy 10-15% extra tiles for cuts, waste, and future repairs
- • Use larger grout joints (1/4") for larger format tiles
- • Plan your layout to avoid narrow tile strips at edges
- • Use a leveling system for large format tiles
- • Match grout color to tile for a seamless look
What Is Tile Calculation?
Tile calculation determines the quantity of tiles needed for floors, walls, backsplashes, and other surfaces. Accurate estimation accounts for the installation area, tile size, pattern layout, and waste from cutting and breakage.
| Tile Type | Common Sizes | Typical Use | Price Range |
|---|---|---|---|
| Ceramic | 4×4", 6×6", 12×12" | Walls, light-traffic floors | $1-8/sq ft |
| Porcelain | 12×12", 12×24", 24×24" | Floors, high-traffic areas | $3-15/sq ft |
| Natural stone | 12×12", 18×18" | Floors, feature walls | $5-50/sq ft |
| Glass | 1×1", 2×2", 4×12" | Backsplashes, accents | $8-30/sq ft |
| Mosaic sheets | 12×12" sheets | Backsplashes, shower floors | $5-25/sq ft |
| Large format | 24×48", 48×48" | Modern floors, walls | $5-20/sq ft |
Basic Tile Formula
Where:
- Area= Total square footage to tile
- Tile Size= Square footage per tile
- Waste Factor= 0.10 for 10%, 0.15 for 15%, etc.
Calculating Area to Tile
Measure the area carefully, accounting for all surfaces that will receive tile.
| Surface Type | How to Measure | Tips |
|---|---|---|
| Rectangular floor | Length × Width | Measure at multiple points for irregularities |
| L-shaped room | Split into rectangles, sum areas | Draw a sketch and label dimensions |
| Wall | Width × Height per wall | Subtract windows, doors if not tiling behind |
| Backsplash | Length × Height (counter to cabinets) | Include behind stove if applicable |
| Shower walls | Each wall: Width × Height, sum all | Include ceiling if tiling |
| Stairs | (Tread area + Riser area) × number of steps | Include landings |
Tile Size Conversions and Coverage
Convert tile dimensions to square footage to determine how many tiles you need.
| Tile Size (inches) | Sq Ft per Tile | Tiles per Sq Ft | Box Coverage (typical) |
|---|---|---|---|
| 4×4 | 0.111 | 9.0 | 10-12 sq ft |
| 6×6 | 0.25 | 4.0 | 12-15 sq ft |
| 12×12 | 1.0 | 1.0 | 10-15 sq ft |
| 12×24 | 2.0 | 0.5 | 12-16 sq ft |
| 18×18 | 2.25 | 0.44 | 13-18 sq ft |
| 24×24 | 4.0 | 0.25 | 12-16 sq ft |
Tile Size Calculation
Where:
- Length, Width= Tile dimensions in inches
- 144= Square inches per square foot
Waste Factors by Installation Pattern
Different installation patterns require different amounts of cutting, affecting waste percentage.
| Pattern | Waste Factor | Description | Difficulty |
|---|---|---|---|
| Straight lay (grid) | 10% | Tiles aligned in rows and columns | Easiest |
| Brick/Offset | 10-15% | Staggered 50% like bricks | Easy |
| 1/3 Offset | 10-15% | Staggered 33% | Easy |
| Diagonal | 15-20% | 45-degree angle layout | Moderate |
| Herringbone | 15-20% | V-shaped zigzag pattern | Moderate |
| Chevron | 20-25% | Angled tiles forming arrows | Difficult |
| Pinwheel | 15% | Large tile with small accent corners | Moderate |
| Basketweave | 15% | Interlocking rectangular pattern | Moderate |
First-time tilers: Add an extra 5-10% beyond the pattern recommendation. Broken tiles and cutting mistakes happen.
Grout and Mortar Calculation
Don't forget to calculate thinset mortar and grout for your tile installation.
| Material | Coverage | Factors Affecting Usage |
|---|---|---|
| Thinset mortar (50 lb bag) | 80-100 sq ft (1/4" notch) | Larger tiles need more; back-buttering increases usage |
| Medium bed mortar (50 lb bag) | 40-60 sq ft (1/2" notch) | Large format and uneven substrates |
| Sanded grout (25 lb bag) | 100-200 sq ft | Joints wider than 1/8"; tile size matters |
| Unsanded grout (10 lb bag) | 100-150 sq ft | Joints 1/8" or smaller; walls and mosaics |
| Epoxy grout | Per manufacturer | Waterproof, stain-resistant; expensive |
Grout joint width: Larger joints use more grout. A 1/4" joint uses roughly twice as much grout as a 1/8" joint.
Calculating Boxes to Order
Tile is sold by the box, with each box covering a specific square footage.
| Step | Calculation | Example |
|---|---|---|
| 1. Calculate area | Length × Width | 10 × 12 = 120 sq ft |
| 2. Add waste factor | Area × (1 + waste %) | 120 × 1.10 = 132 sq ft |
| 3. Find box coverage | Check tile box or listing | 12 sq ft per box |
| 4. Calculate boxes | Needed sq ft ÷ box coverage | 132 ÷ 12 = 11 boxes |
| 5. Round up | Always round up | Order 11 boxes |
| 6. Same lot/dye lot | Order all at once | Color varies between lots |
Important: Always order from the same dye lot. Tiles from different production runs may have slight color variations that become noticeable when installed.
Special Area Calculations
Some installations require additional considerations for complex areas.
| Area | Calculation Tips | Extra Considerations |
|---|---|---|
| Bathroom floor | Calculate around toilet (subtract ~2 sq ft) | Include threshold |
| Shower floor | Include curb top and sides | Smaller tiles for slope/drain |
| Kitchen backsplash | Counter to cabinet, behind range | Outlet and switch cutouts |
| Fireplace surround | Face + returns + hearth | Heat-resistant tile required |
| Stairs | Tread + riser per step + nosing | Bullnose or special trim |
| Outdoor patio | Include drainage slope | Frost-proof tile required |
Trim pieces: Don't forget bullnose, pencil liner, chair rail, or other trim pieces for finished edges. Count linear feet needed.
Worked Examples
Calculate Floor Tiles
Problem:
A 10×12 foot bathroom floor using 12×12 inch tiles with a straight lay pattern. How many tiles are needed?
Solution Steps:
- 1Calculate floor area: 10 × 12 = 120 sq ft
- 2Each 12×12 tile = 1 sq ft coverage
- 3Add 10% waste for straight lay: 120 × 1.10 = 132 tiles
- 4If sold in boxes of 10: 132 ÷ 10 = 13.2 boxes
- 5Round up: Order 14 boxes
Result:
Order 14 boxes (140 tiles) for a 120 sq ft floor with adequate waste allowance. Keep extras for future repairs.
Calculate Backsplash Tiles
Problem:
Kitchen backsplash: 15 feet long, 18 inches tall, using 4×4 inch tiles in a diagonal pattern.
Solution Steps:
- 1Convert height: 18 inches = 1.5 feet
- 2Calculate area: 15 × 1.5 = 22.5 sq ft
- 3Each 4×4 tile = 16 sq in = 0.111 sq ft
- 4Base tiles: 22.5 ÷ 0.111 = 203 tiles
- 5Add 20% for diagonal pattern: 203 × 1.20 = 244 tiles
- 6If 20 tiles per box: 244 ÷ 20 = 12.2 boxes
Result:
Order 13 boxes of 4×4 tiles. Diagonal patterns require more cuts at walls and corners, hence the higher waste factor.
Calculate Shower Wall Tiles
Problem:
Shower enclosure: 3 walls (4ft, 3ft, 4ft wide) × 7ft tall, using 12×24 inch tiles.
Solution Steps:
- 1Calculate total wall area: (4+3+4) × 7 = 77 sq ft
- 2Each 12×24 tile = 2 sq ft
- 3Base tiles: 77 ÷ 2 = 38.5 tiles
- 4Add 15% waste: 38.5 × 1.15 = 44.3 tiles
- 5Round up: 45 tiles needed
- 6If 6 tiles per box (12 sq ft): 45 ÷ 6 = 7.5 boxes
Result:
Order 8 boxes of 12×24 tile. Consider bullnose or Schluter trim for finished edges where tile meets drywall.
Tips & Best Practices
- ✓Add 10% waste for straight patterns, 15% for diagonal, 20% for complex patterns like herringbone.
- ✓Order all tile at once from the same dye lot to ensure color consistency.
- ✓Larger tiles cover faster but require a very level substrate and may have more waste on small rooms.
- ✓Don't forget bullnose, trim pieces, and edge treatments when calculating.
- ✓Dry-lay tiles before applying mortar to plan cuts and check the layout.
- ✓Keep leftover tiles for future repairs—styles are frequently discontinued.
- ✓Calculate thinset mortar and grout separately; don't rely on 'kits' for larger jobs.
Frequently Asked Questions
Sources & References
Last updated: 2026-01-22