🧱 Tile Calculator – Free Online DIY Tool
Calculate exactly how many tiles you need for floors and walls. 100% free, no sign-up required.
Total Area: 0 m²
Tiles Needed: 0 tiles
Recommended Boxes (10/box): 0
How to Use the Tile Calculator
The Tile Calculator is a simple yet essential tool designed to help you work out exactly how many tiles you need for any tiling project. Whether you're tiling a bathroom floor, a kitchen backsplash, or an entire room, this tool takes the guesswork out of your project.
Step 1: Enter the length and width of the area you want to tile in metres.
Step 2: Enter the length and width of your chosen tile in centimetres.
Step 3: Choose your wastage allowance based on your tile layout and cutting requirements.
Step 4: Click "Calculate Tiles" and the tool will tell you exactly how many tiles you need and how many boxes to buy.
Why Use a Tile Calculator?
Tiling can be an expensive project, and buying too many tiles is a waste of money. Buying too few tiles means delays while you wait for more stock — and there's no guarantee the same batch will be available.
This tile calculator helps you:
- Save money – buy exactly what you need, no more, no less
- Reduce waste – minimise leftover tiles that can't be returned
- Plan your budget – know exactly how much your project will cost
- Avoid delays – buy everything you need in one trip
Whether you're a DIY enthusiast or a professional tiler, this tool is essential for any tiling project.
Understanding Wastage Allowance
Wastage allowance is the extra tiles you buy to account for cuts, breaks, mistakes, and future repairs. Tiling always involves some waste — tiles break during cutting, edges need to be trimmed, and you might make a mistake.
Recommended wastage allowances:
- 5% – Minimal cuts, simple rectangular room
- 10% – Standard cuts, average room shape
- 15% – Complex cuts, irregular room shape
- 20% – Diagonal layouts, herringbone patterns
It's always better to have a few spare tiles than to run out. Keep leftover tiles for future repairs.
Tile Sizes and Coverage
Common tile sizes and how many tiles you need per square metre:
- 10cm x 10cm: 100 tiles per m²
- 15cm x 15cm: 44.4 tiles per m²
- 20cm x 20cm: 25 tiles per m²
- 30cm x 30cm: 11.1 tiles per m²
- 45cm x 45cm: 4.9 tiles per m²
- 60cm x 60cm: 2.8 tiles per m²
Our calculator handles all tile sizes automatically — just enter your tile dimensions.
Frequently Asked Questions
1. How many tiles do I need per square metre?
It depends on your tile size. For 30cm x 30cm tiles, you need 11.1 tiles per m². Our calculator works this out automatically for any tile size.
2. How do I calculate tiles for a room?
Measure the length and width of the room, multiply to get the area, then divide by the area of one tile. Add wastage allowance. Our calculator does this for you.
3. How much wastage should I allow for tiling?
10% is standard for most tiling projects. Add more for diagonal layouts or complex cuts.
4. How many 30x30 tiles do I need per square metre?
You need approximately 11.1 tiles per square metre. Add wastage on top of this.
5. How many boxes of tiles do I need?
Our calculator tells you the number of tiles needed and then calculates how many boxes to buy based on the tiles per box.
6. Should I buy extra tiles for future repairs?
Yes, it's always recommended to keep a few spare tiles for future repairs. The wastage allowance in our calculator helps with this.
7. What if my room isn't rectangular?
Break your room into rectangles, calculate each area separately, then add them together. Add wastage on the total.
8. Can I use this calculator for wall tiles?
Yes, this calculator works for both floor and wall tiles. Measure the wall height and width in the same way.
Related Tools
If you found this tile calculator useful, you might also like these related DIY tools:
- Paint Calculator – work out how much paint you need for any room
- Carpet Calculator – calculate how much carpet you need
- Flooring Calculator – work out how much laminate or wood flooring you need
- Concrete Calculator – calculate concrete volume for slabs and foundations