How to use this tile calculator
- Units, pick Feet or Metres for your room measurements.
- Area size, enter the length and width of the floor or wall you are tiling.
- Tile size, enter one tile's width and length, in inches for Feet mode or centimetres for Metres mode.
- Waste %, leave it at 10% or raise it for tricky layouts.
- Tiles per box (optional), enter this to also see how many boxes to buy.
- Read the total area, tiles needed and boxes, they update as you type.
Nothing is submitted or stored: the numbers never leave your device, so you can plan a job privately.
How to work out tiles needed
The maths behind tiling is simple. First find the area of the surface by multiplying its length by its width. Then find the area of one tile the same way. Divide the surface area by one tile's area and you have the bare number of tiles to cover the space: tiles = area ÷ one tile's area.
That bare figure is never enough on its own. You will cut tiles at edges, around pipes and in corners, and some will crack during fitting, so you should add roughly 10% for cuts and breakages and then round up to the next whole tile. This calculator divides the areas for you, applies your waste percentage, and rounds up automatically so the count is ready to take to the shop.
Because tiles are sold in boxes, the last step is to divide the tiles needed by the tiles per box and round up. Enter a tiles-per-box figure and the boxes slot fills in, otherwise it stays blank.
Note: keep a few spare tiles after the job for future repairs, and buy all your tiles from the same batch where you can, as colours can shift slightly between production runs.
Frequently asked questions
How many tiles do I need for a room?
Multiply the floor length by the width to get the area, divide by the area of one tile, add about 10% for cuts and breakages, then round up. The calculator above does this instantly.
How much waste should I add?
10% covers most straight, square rooms. Use 15% to 20% for diagonal patterns, lots of corners, or large-format tiles where offcuts are harder to reuse.
How do I measure my tile size?
Measure one tile edge to edge. In Feet mode enter width and length in inches, in Metres mode enter them in centimetres. Common sizes are 12 by 12 inches or 30 by 30 cm.
How many tiles are in a box?
It depends on the tile size and brand, so check the box or product page, then enter that as tiles per box to see how many boxes to buy.
Is my data uploaded?
No, everything is calculated on your device and nothing is sent anywhere.