UK home improvement calculator
Tile Calculator UK
Estimate tile area, tile count, wastage, boxes, and optional cost for floors, walls, bathrooms, kitchens, and splashbacks with simple UK-friendly inputs.
Last reviewed: 25 April 2026
Calculator inputs
Choose the surface, enter the area, then set your tile size, wastage, and optional box details.
Result Card
Estimated tiles to buy
This estimate uses 300 x 600 mm tiles with 10% extra.
Raw measured area: 12 m2
10% extra for cuts, breakages and spares
This is the coverage target including your wastage allowance.
0.18 m2 per tile
67 before wastage
You need about 74 tiles, or 13.2 m2 including wastage. Check the box label before buying.
Using the exact tile size and box coverage from the product page can help avoid buying too much or too little.
How this estimate works
See the exact steps behind the estimate so the result stays easy to sense-check.
This calculator adds up the area you want to tile, subtracts any doors, windows or gaps if selected, then adds a wastage allowance for cuts and breakages. It divides the final area by the tile size to estimate the number of tiles needed. If you enter box details, it also estimates how many boxes to buy.
- Raw area = measured rectangles added together, or your known total m2
- Deduction area = doors x 1.6 + windows x 1.5 + custom deduction
- Area to tile = max(raw area - deductions, 0)
- Total area to buy = area to tile x (1 + wastage / 100)
- Tiles needed = final area divided by the area of one tile, rounded up
Tile planning note: many UK tile calculators recommend adding around 10% extra for cuts and wastage. Complex or diagonal layouts may need more.
Example calculation
A worked example helps the user compare the result with a familiar everyday scenario.
A 4m x 3m floor is 12 m2 before wastage.
With 300 x 600 mm tiles and a 10% allowance, you should plan for about 13.2 m2 in total, which is around 74 tiles.
If each box covers 1.44 m2, that works out to about 10 boxes.
Simple tile buying tips
A few simple checks can make the estimate more accurate and help avoid waste.
- Measure each wall or floor section separately.
- Split L-shaped rooms into rectangles.
- Add extra for cuts, breakages and future repairs.
- Check the tile box for coverage or tiles per box.
- Buy tiles from the same batch where possible.
- Keep a few spare tiles for future repairs.
- Use a higher wastage allowance for diagonal or complex layouts.
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Tile calculator questions
Short answers to common tile-planning questions.
How many extra tiles should I buy?
A straight layout often uses around 10% extra, while diagonal or more complex layouts may need about 15% extra to cover cuts, breakages and a few spares.
Should I subtract doors and windows?
Yes for tiled walls, bathrooms and splashbacks if those openings reduce the area you will actually tile. Floor projects usually do not need those deductions.
What if I only know the total square metres?
You can switch to the known-area option and enter the total m2 directly instead of measuring each rectangle.
Why do box details matter?
Tiles are often sold by box, not just by tile. Entering tiles per box or coverage per box helps the calculator round your estimate into a practical number of boxes to buy.
Estimate notice
This is an estimate. Actual tile needs can vary depending on tile batch variation, grout spacing, cutting patterns, breakages, box coverage, and site conditions.