Multiple tiled surfaces
Add as many floors or walls as needed, including repeated identical surfaces using the quantity field.
Free professional trade tool
Free Tile Calculator
Calculate floor or wall area, subtract doors and openings, enter the exact tile size, add a realistic waste allowance, round up to full boxes and estimate material cost.
Exact tile quantity
Floors, walls and multiple areas
Waste, boxes and cost
No sign-up required
1
Measure the tiled area
Add one room, several walls or multiple separate areas. You can also subtract doors, windows, kitchen units or any section that will not be tiled.
Surfaces to tile
Use length × width for floors, or width × height for walls.
Deductions
Optional. Subtract windows, doors, baths, cabinets or untiled sections.
Enter the final net area after any openings have already been removed.
Current net tiled area
12.00 m²
2
Enter the tile and layout details
The calculator uses the actual tile dimensions to work out the tile count, then adds your waste allowance before rounding up.
Millimetres. Used only for the setting-out estimate.
Suggested waste allowance
10%
A 10% starting allowance is commonly used for a simple straight layout.
Planning guidance varies by job. Topps Tiles uses 10% for cuts and wastage, while Porcelanosa advises allowing 10–15% and more care for intricate layouts. Topps Tiles · Porcelanosa
3
Round to boxes and estimate the cost
These details are optional. Add the packaging information from the tile box or supplier listing to calculate how many full boxes you should buy.
The result always rounds up to a complete box so you do not under-order.
Optional price estimate
Enter the supplier’s price basis. The calculator uses the rounded purchase quantity when box details are available.
Built for real jobs
More than a basic square-metre calculator
Use the same calculation for a single bathroom floor, several walls, a kitchen splashback or multiple rooms.
Doors and openings removed
Subtract windows, doors, cabinets, baths and other areas that will not receive tile.
Pattern-aware waste guidance
Start at 10% for a simple straight layout, with higher suggestions for diagonal, herringbone and awkward cutting.
Whole boxes and cost
Enter tiles per box or coverage per box, then calculate the rounded purchase quantity and optional material cost.
Preparing a customer price for the job? Use the free Quote Generator, or create the final bill with the free Invoice Generator.
Keep every job, customer and payment organised
HandyMinder is a simple digital job diary for handymen and tradespeople who want their work details, payments and upcoming income in one clear place.
Useful things to know
Tile calculator questions
Practical guidance before you place the order or start cutting.
How much extra tile should I allow for waste?
Ten percent is a common starting allowance for a simple straight layout. Diagonal, herringbone, natural stone, large-format tiles and rooms with many corners or niches often need a larger allowance. The calculator suggests a starting figure but lets you enter your own percentage.
How is the exact number of tiles calculated?
The calculator divides the net tiled area by the area covered by one tile, adds the selected waste percentage and rounds up to the next whole tile. When box details are entered, it then rounds up again to complete boxes.
Should I subtract doors, windows and cabinets?
Usually yes when those areas will definitely remain untiled. For very small openings, some tradespeople leave them in the measurement because the additional material can help cover cuts and breakage. Use the deduction section according to the actual job.
Does the grout joint change how many tiles I need?
The main purchase quantity is based on tile coverage and waste, which is how tiles are normally sold. The grout-joint value is used only for the approximate row and column setting-out estimate because actual edge cuts and layout centring must still be checked on site.