Tile Calculator
This tile calculator works out how many tiles, boxes and how much grout you need. A room of 4 × 3 m with 60 × 30 cm tiles, 3 mm joints and 10% waste needs 73 tiles, which is 10 boxes of 8 (80 tiles) and about 2.6 kg of grout.
Example: Room length 4 m · Room width 3 m · Tile length 60 cm · Tile width 30 cm · Grout joint width 3 mm · Tile thickness 9 mm · Waste 10 % · Tiles per box (optional) 8 → Tiles needed: 10 boxes of 8 tiles = 80 tiles (including 10% waste). Source: Wikipedia – Tile: sizes, grout joints and installation. Updated: .
How it is calculated
How to calculate tiles
The area is length times width: 4 × 3 m = 12 m² (129 sq ft). Each tile counts with its grid size including the joint, here (60 + 0.3) × (30 + 0.3) cm = 0.1827 m². Divided into the area that gives 66 tiles without waste. On top comes waste for cuts and breakage, at 10% that is 73 tiles.
Boxes
Tiles are sold in boxes. The calculator rounds up to whole boxes: at 8 tiles per box, 73 tiles is 10 boxes, so 80 tiles. Buy a small reserve: later purchases can differ in shade and batch.
Grout
The amount comes from the joint volume: joint width × tile thickness × (tile length + tile width) per tile, times the density of the grout (here 1.6 kg/l as a common guide). For the example that is about 0.21 kg per m² and 2.6 kg for the room.
Choosing waste
- 5 to 10%: straight layout in a room without many corners.
- 10 to 15%: diagonal or staggered layout, many corners, niches and cut-outs.
- More: large formats and patterns that must match.
Limits
The calculator assumes a rectangular area without cut-outs. Subtract doors, windows or a bathtub from the area first. The grout need is a guide; the manufacturer’s figures for consumption and mixing take priority.
Frequently asked questions
How many tiles do I need per square metre?
It depends on the size. With 60 × 30 cm and 3 mm joints about 5.5 tiles per m², with 30 × 30 cm around 11.
How much waste should I allow?
For a straight layout 5 to 10%, for a diagonal layout or many corners 10 to 15%.
How do I calculate grout?
From the joint volume per tile times density. For the example it is about 0.2 kg per m². The calculator shows the need for your area.
How do I work out tiles for a wall?
Use the width and height of the wall instead of room length and width. Subtract windows and doors from the area first.
Should I buy extra tiles?
Yes, one or two boxes of reserve make sense, because shade and batch can differ when you reorder.
Sources and legal basis
As of: · Editorial policy
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