Renovimo
Decorative tiles in a finished interior

Tile calculator

Tile calculator:
how much do you need?

Calculate floor or wall tiles by room and tile size. Subtract doors and windows, choose a layout, and estimate full boxes, adhesive, grout, spacers and cutting waste with a live 3D preview.

Enter measurements

1 Layout

What are you tiling?
Walls in the room

These set the room size and openings for the walls you're tiling.

2 Each wall

Size and openings for every wall you're tiling. Windows are optional — leave them at zero if there are none.

1 Wall 1
2 Wall 2
3 Wall 3
4 Wall 4

3 Tile style

Sets the tile size used in the maths and the look of the 3D preview.

Tiling tools laid out ready for work

Based on your result

What you'll need

Quantities update after every calculation. Brands, colours and prices can be chosen at your preferred store.

Tile
Walls and floor, plus 10% waste
Calculate above
Adhesive
Thin-set mortar to bed the tile
—
Grout
Fills the joints between tiles
—
Spacers
Keep joints even while setting
—

The maths

How we work out your tile

Each wall is measured on its own and its doors and windows are removed, then the floor's footprint is added. The total is padded for cuts and breakage before it's split into tiles and boxes.

wall area = width × height − doors − windows
floor area = length × width
tiles = ⌈ (wall + floor) × 1.10 ÷ tile size ⌉
+10%
cuts & breakage
10 sq ft
per box of tile
50 sq ft
per bag of adhesive
21 sq ft
removed per door
15 sq ft
removed per window
ft ↔ m
converted automatically
  1. 01

    Measure walls and floor

    Enter each wall separately and the floor is taken from the room footprint — both get tiled.

  2. 02

    Remove the openings

    Doors and windows are deducted from the wall they sit on, so you are not buying tile for them.

  3. 03

    Pick a tile size

    Larger tiles mean fewer pieces; mosaics mean many more. The style you choose drives the count and the grout.

  4. 04

    Add cuts and split into boxes

    We add 10% for cuts and breakage, then divide by the tile size and box coverage to give tiles and boxes to buy.

Good to know

Tile questions, answered

The calculator adds 10% for straight layouts, which covers cuts and the odd broken tile. For diagonal or herringbone patterns add closer to 15%, and keep a few spare tiles for future repairs.

Larger tiles cover an area with fewer pieces and less grout, and go down faster. They need a flatter surface though, so on uneven walls smaller tiles or extra levelling can work out better.

Adhesive is estimated at about 50 square feet per bag of thin-set with a standard trowel. Grout depends on tile size and joint width — smaller tiles need much more, which is why the estimate changes with the style you pick.

It is usually easiest and best-looking to tile the full wall, then cut around fixtures. If you plan to skip large built-ins, reduce that wall’s size or add it as an opening.

Spacers keep the grout lines even and are cheap insurance for a tidy finish. For large-format tiles, levelling clips also help avoid lippage where one tile sits proud of the next.