How many tiles do you need per m²?
The number of tiles per m² depends primarily on the tile size. As a rule of thumb:
These figures exclude grout joints and waste. With joints and waste you should typically add 5–10%.
How to calculate it
The formula is straightforward: divide 1 m² (10,000 cm²) by the tile area in cm². Remember to account for the grout width, which is typically 2–5 mm.
Always multiply by the room area first and round up at the end – not 2.8 up to 3 per m² and then multiply. The tile calculator lays the tiles row by row with the joint and counts whole tiles in each direction, hence 39 here against 37 in the estimate. Use the estimate for the budget and the calculator for the shopping list.
Common tile sizes and tiles per m²
The table below shows the most popular tile sizes and the approximate number of tiles per m² — excluding grout joints.
Don't forget waste and cutting
Regardless of tile size, you should always add extra for waste. Tiles can break, need cutting along edges, around pipes and corners — and sometimes the pattern doesn't align perfectly.
- •5% — simple rectangular room, large tiles, straight layout
- •10% — most rooms, many corners and cuts
- •15% — diagonal layout, many niches, irregular rooms
It's always cheaper to buy a few extra than to come up short and risk the colour batch being discontinued.
Calculate your tile needs automatically
Use MyPlanDIY's free tile calculator — enter the room dimensions and tile size, and get the exact quantity including waste and packs.
Use the results in a real project
With MyPlanDIY you can save materials, create a budget, keep track of tasks and organise everything in one project — completely free.
No credit card required. Free sample project included.