Tile calculator
Find out how many tiles, boxes, bags of tile adhesive and packs of grout a floor, a wall or a kitchen backsplash needs. The joint and the allowance for cuts are counted, and the result is rounded up to what the shop sells.
You need
48 tiles
8 boxes · 6 pcs per box · 600×300 mm
- Adhesive
- 3 bags of 20 kg41.2 kg
- Grout
- 1 pack of 5 kg1.2 kg
- Floor area3.20 × 2.45 = 7.84 m²
- One tile with its joint(600 + 2) × (300 + 2) mm = 0.1818 m²
- Tiles without allowance7.84 ÷ 0.1818 = 43.1 pcs
- With 10 % allowance, rounded up43.1 × 1.10 = 47.4 → 48 pcs
- Boxes of 6 pcs48 ÷ 6 = 8.00 → 8 boxes
- Adhesive, 5 kg/m² + 5 %7.84 × 5 × 1.05 = 41.2 kg → 3 bags of 20 kg
- Grout, joint depth 9 mm + 10 %(600 + 300) ÷ (600 × 300) × 9 × 2 × 1.5 = 0.14 kg/m² → 1.2 kg
Adhesive and grout use average values from the «United Kingdom, Ireland, Australia and New Zealand» preset. Check them against your manufacturer's pack.
The calculator gives an estimate by the usual norms. Consumption depends on the product and the surface: check the manufacturer’s data before you buy.
How it’s calculated
- 1
Area: length × width of the floor or wall, or the area you already know.
- 2
One tile together with its joint covers (a + s) × (b + s), where a and b are the tile sides and s is the joint.
- 3
Tiles without allowance = area ÷ area of one tile with its joint.
- 4
Add the allowance for cuts and breakage — usually 10 % for straight and offset layouts, 15 % for diagonal — and round up to whole tiles, then to whole boxes.
- 5
Adhesive = area × consumption per m² for the tile size; grout = joint length × joint width × depth × density. Both get a small reserve and are rounded up to bags and packs.
Worked example
A bathroom floor tiled with 60 × 30 cm porcelain tiles, a 2 mm joint, straight layout:
The input
- Length, m
- 3.2
- Width, m
- 2.45
- Tile size, mm
- 600×300 · 6 pcs
- Joint, mm
- 2
- Layout
- Straight
- Allowance for cuts and breakage, %
- 10
The result
48 tiles
8 boxes · 6 pcs per box · 600×300 mm
- Adhesive: 3 bags of 20 kg
- Grout: 1 pack of 5 kg
The calculation
- Floor area3.20 × 2.45 = 7.84 m²
- One tile with its joint(600 + 2) × (300 + 2) mm = 0.1818 m²
- Tiles without allowance7.84 ÷ 0.1818 = 43.1 pcs
- With 10 % allowance, rounded up43.1 × 1.10 = 47.4 → 48 pcs
- Boxes of 6 pcs48 ÷ 6 = 8.00 → 8 boxes
- Adhesive, 5 kg/m² + 5 %7.84 × 5 × 1.05 = 41.2 kg → 3 bags of 20 kg
- Grout, joint depth 9 mm + 10 %(600 + 300) ÷ (600 × 300) × 9 × 2 × 1.5 = 0.14 kg/m² → 1.2 kg
How many tiles per square metre?
It depends only on the tile size and the joint. With a 2 mm joint, one square metre takes about 11 tiles of 30 × 30 cm, 5.5 tiles of 60 × 30 cm, 2.76 tiles of 60 × 60 cm and 1.38 tiles of 120 × 60 cm. The allowance for cuts comes on top of that.
How many tiles do I need for 10 m²?
For 10 m² of 60 × 60 cm tiles with a 2 mm joint you need 27.6 tiles without allowance; with the usual 10 % that is 31 tiles, with 15 % for a diagonal layout 32. Divide by the pieces in a box and round up — a box is never bought in halves.
How much tile adhesive and grout?
Adhesive is counted per square metre and grows with the tile: small tiles take 2–4 kg/m², large formats 5–6 kg/m² and more, because they need a deeper notch. Grout depends on the joint: the wider and deeper the joint and the smaller the tile, the more grout per square metre.
Questions
How much extra tile should I buy?
Usually 10 % for straight and offset layouts and 15 % for diagonal: diagonal leaves more cut pieces at the walls. For large-format tiles, many pipes or a complex room, add more. Leftover tiles also serve as a spare for repairs later.
Does the joint width matter?
Yes. The joint is part of the area each tile covers, so a wider joint means slightly fewer tiles — and noticeably more grout. The calculator counts both.
Can I count wall tiles with this calculator?
Yes: enter the wall length and the tiled height as the two sizes, or the area of the walls without windows and doors.
Why is the number of boxes rounded up?
Shops sell tiles in whole boxes. The calculator first rounds the tiles up, then divides by the pieces in a box and rounds up again.
The same calculator in the Kvadrino app
Kvadrino for Android works offline: enter the room once and get tiles, paint, flooring and an estimate for the client. The app is in closed testing — write to us and we will add you as a tester.
Coming soon to Google Play