How tile quantity is calculated
Tile quantity starts with net tiled area, tile size, grout spacing if used, and a waste allowance for cuts and breakage.
Tile Calculator
Calculate how many tiles you need for any floor or wall area.
Tile project inputs
Enter project dimensions, tile size, grout joint, waste allowance, box details, and optional price.
Total tiles needed
87
Whole tiles, including waste allowance.
Boxes needed
9
Estimated material cost
Add price
Project area
80 sq ft
Net tiled area
80 sq ft
Tile area
1 sq ft
Effective tile area
1.0209 sq ft
Base tile count
78.36
Waste tile count
7.84
Leftover tiles
3
Leftover coverage
3.88 sq ft
Grout joint used
0.125 inches
Project dimensions summary
10 feet × 8 feet, 1 area(s), tile size 12 × 12 inches.
Copy result
Copy tile count, boxes, waste allowance, project area, leftovers, and cost estimate.
Waste allowance note
Waste depends on layout, cuts, breakage, tile size, room shape, and installer method.
Tile box rounding note
Boxes are rounded up because partial boxes may not be practical to buy.
Grout spacing note
Grout spacing can affect layout, but it may not perfectly predict installed coverage.
Measurement accuracy
Measure carefully and verify exclusions, cabinets, vanities, and fixed fixtures.
Local calculation
Inputs are processed in your browser. No external pricing API is required.
Dynamic tiling insights
Waste planning
A 10% waste allowance is a common starting point for simple tile layouts.
Tile size note
This tile size is practical for many standard floor or wall layouts.
Box planning
Your rounded box count creates leftovers. Keeping spare tiles can help with repairs and shade lot matching.
Project planning
Check tile specifications, box coverage, grout, adhesive, underlayment, trim, and installation instructions before buying.
Tile project breakdown
Base project area
80 sq ft
Excluded area
0 sq ft
Net tiled area
80 sq ft
Tile size
12 × 12 inches
Tile area
1 sq ft
Grout joint width
0.125 inches
Base tile count
78.36
Waste allowance
10%
Final recommended tile count
87
Boxes required
9
Estimated material cost
Add price to estimate
Leftover tiles or coverage
3 tile(s), 3.88 sq ft
Tile waste allowance guide
Simple rectangular layout
5% to 10%
Good for straight layouts with few cuts
Standard room with cuts
10%
Common starting point for many DIY projects
Diagonal layout
15%+
Diagonal cuts often increase waste
Herringbone or patterned layout
15% to 20%
Pattern matching can require more tile
Small mosaic or complex backsplash
10% to 20%
Small pieces and outlets can increase cutting
Future repair reserve
Extra box if possible
Useful for shade lot matching and repairs
Common tile size guide
3 in × 6 in subway tile
Backsplashes and walls
Many grout joints and more pieces
6 in × 6 in tile
Walls and small floors
Moderate piece count
12 in × 12 in tile
Common floor tile
Simple area math and common box sizing
12 in × 24 in tile
Modern floor and wall tile
Check flatness and layout carefully
24 in × 24 in large format tile
Large floors and walls
May need lippage control and careful handling
Mosaic sheets
Backsplashes and showers
Often sold by sheet coverage
Tile project planning guide
Tile
Main material amount based on area, tile size, and waste allowance
Main material amount based on area, tile size, and waste allowance
Grout
Amount depends on tile size, joint width, and tile thickness
Amount depends on tile size, joint width, and tile thickness
Thinset or adhesive
Coverage varies by trowel size, substrate, and product
Coverage varies by trowel size, substrate, and product
Spacers
Used to keep joint spacing consistent
Used to keep joint spacing consistent
Trim or edge pieces
Needed for exposed edges, transitions, and finished corners
Needed for exposed edges, transitions, and finished corners
Underlayment or backer board
May be needed for floors, wet areas, and substrate preparation
May be needed for floors, wet areas, and substrate preparation
Sealant where needed
Some stone, grout, and wet areas may require sealing
Some stone, grout, and wet areas may require sealing
Box and lot planning guide
Tiles per box
Product specific
Use the label value for box count
Coverage per box
Square feet or square meters
Often easier for mosaic sheets and mixed sizes
Shade lot or dye lot
Match boxes when possible
Different lots can have visible colour variation
Broken tiles
Plan a small buffer
Shipping and cutting can create breakage
Returns and spare tiles
Check store policy
Keeping spare tile can help future repairs
Tile estimating guide
These notes explain tile estimating concepts without repeating the calculator result.
Why waste allowance matters
Waste helps cover cuts, broken pieces, layout changes, pattern matching, and future repair tiles.
How tile size affects tile count
Smaller tiles usually require more pieces and more grout joints. Larger tiles need careful handling and layout planning.
How grout spacing changes layout
Grout joints add spacing between tiles, which can change layout coverage, but real installation still depends on layout and cuts.
Measuring floors, walls, and backsplashes
Measure length and width for floors, and length and height for walls or backsplashes. Split irregular areas into simpler rectangles.
Handling exclusions and fixtures
Excluded areas can include fixed cabinets or fixtures, but verify whether tile should continue underneath before subtracting.
Why box rounding and shade lots matter
Tile is often sold by box, and colour can vary by shade lot or dye lot. Extra matching tiles are useful for repairs.
Limitations of tile calculators
Estimates are approximate. Product specs, substrate preparation, waterproofing, trim, grout, adhesive, and installer method matter.
Formula
Project Area = Length × Width
Net Tiled Area = Project Area − Excluded Area
Tile Area = Tile Length × Tile Width
Base Tile Count = Net Tiled Area ÷ Tile Area
Waste Tiles = Base Tile Count × Waste Percentage
Final Tile Count = Base Tile Count + Waste Tiles
Boxes Needed = Final Tile Count ÷ Tiles Per Box
Estimated Material Cost = Boxes Needed × Price Per Box
Effective Tile Length = Tile Length + Grout Joint Width
Effective Tile Width = Tile Width + Grout Joint Width
Variables
- Project length and width define the tiled area.
- Excluded area removes space that will not be tiled.
- Tile size determines how much area one tile covers.
- Grout joint width adjusts the effective layout size when included.
- Waste allowance adds extra tile for cuts, breakage, and future repairs.
- Tiles per box and box coverage help estimate purchase quantity.
Worked example
A 10 ft by 8 ft floor is 80 sq ft. A 12 in by 12 in tile covers about 1 sq ft. With 10% waste, the estimate is about 88 tiles before box rounding.
Assumptions
The calculator assumes simple rectangular areas, user-entered exclusions, and tile dimensions from the product.
Limitations
Tile estimates may vary by layout, cuts, breakage, grout joint, shade lot, product coverage, and installation method.
Frequently asked questions
How do I calculate how many tiles I need?
Calculate the net tiled area, divide by the effective tile area, add waste allowance, then round up to a whole tile count.
How much extra tile should I buy?
Many simple layouts use about 10% extra. Diagonal patterns, herringbone layouts, breakage, cuts, and future repairs may need more.
Should I include grout spacing in tile calculations?
Grout spacing can help estimate layout coverage, but it may not perfectly predict installed coverage. Always check the tile layout and product specs.
How do I calculate tile boxes needed?
Divide the final recommended tile count by tiles per box, or divide the final area by box coverage, then round up.
Should tile go under cabinets, appliances, or vanities?
It depends on the room, product, installation method, and manufacturer guidance. Check project plans before subtracting fixed areas.
How do I measure an irregular tile area?
Split the space into rectangles or smaller simple shapes, calculate each area, then add them together before subtracting exclusions.
Does tile waste vary by layout pattern?
Yes. Straight layouts often need less waste than diagonal, herringbone, patterned, mosaic, or irregular rooms.
Why should I keep spare tiles after installation?
Spare tiles help with future repairs, shade lot matching, discontinued products, and accidental breakage.
Can this calculator estimate wall tile and backsplash tile?
Yes. Enter the wall or backsplash length and height as the project dimensions, then add tile size, waste, boxes, and cost details.
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