How Many Tiles Do You Need? A Simple Guide to Calculating Tile Quantity

Quick answer

To calculate how many tiles you need, first calculate the area you want to cover. Then calculate how much area one tile covers. Divide the total area by the area of one tile, round up to a whole tile and add a reasonable allowance for cuts, breakage and future needs.

The basic formula is:

Number of tiles = Total area ÷ Area covered by one tile

But real projects need more planning than the formula suggests.

Step 1: Measure the room

For a simple rectangular room:

Area = Length × Width

For example, suppose your living room is:

6 m × 4 m

Then:

6 × 4 = 24 m²

Your floor area is 24 square metres.

Step 2: Calculate the area of one tile

You must convert the tile dimensions from millimetres to metres.

600×600 mm tile

600 mm = 0.6 m

So:

0.6 × 0.6 = 0.36 m²

One 600×600 mm tile covers 0.36 square metres.

600×1200 mm tile

600 mm = 0.6 m

1200 mm = 1.2 m

So:

0.6 × 1.2 = 0.72 m²

One 600×1200 mm tile covers 0.72 square metres.

Step 3: Divide the room area by tile coverage

For a 24 m² room using 600×600 mm tiles:

24 ÷ 0.36 = 66.67

You cannot buy 66.67 tiles, so you round up:

67 tiles before allowance

For 600×1200 mm tiles:

24 ÷ 0.72 = 33.33

Round up:

34 tiles before allowance

Step 4: Add an allowance

Your calculated quantity is not necessarily the quantity you should order.

Tiles may need to be cut around:

• Walls

• Doorways

• Columns

• Corners

• Kitchen cabinets

• Bathroom fixtures

• Staircases

• Irregular room shapes

There can also be breakage during handling and installation.

The right allowance varies according to the room shape, tile size, installation pattern and installer. A simple rectangular room with a straightforward layout may need less allowance than a complex space with many cuts.

As an example only, if you use a 10% allowance:

600×600 mm example

Base quantity: 67 tiles

10% of 67 = 6.7

Round up:

74 tiles

600×1200 mm example

Base quantity: 34 tiles

10% of 34 = 3.4

Round up:

38 tiles

These are examples, not a universal wastage rule.

What if the room is not rectangular?

Break the room into smaller rectangles.

For example, an L-shaped room can be divided into two rectangles.

Calculate:

Area 1 + Area 2 = Total area

Then use the same tile calculation.

What about walls?

Wall tiles require a slightly different calculation.

For a rectangular wall:

Wall area = Width × Height

If a bathroom wall is 3 m wide and 2.4 m high:

3 × 2.4 = 7.2 m²

If there are multiple walls, calculate each one separately and add them together.

Then subtract significant openings such as large windows or doors where appropriate.

What about doors and windows?

If you are calculating wall tiles, openings can reduce the tile area required.

For example:

Wall area: 7.2 m²

Door opening: 0.9 m × 2.1 m

Door area:

0.9 × 2.1 = 1.89 m²

Approximate tile area:

7.2 - 1.89 = 5.31 m²

This is still only the net area calculation. You need to consider cuts and the actual installation layout.

Tile quantity table

For a 24 m² area:

These figures are rounded up.

Why you should not order only the exact calculated number

Imagine you calculate that you need exactly 67 tiles.

If one tile breaks during installation, you now have 66 usable tiles.

If the installer needs additional cuts, you may need more.

If the product is later discontinued or unavailable, replacing a damaged tile may also become difficult.

For that reason, project planning should include a reasonable allowance and, where appropriate, retain a small quantity of spare tiles after installation.

What affects tile wastage?

Wastage is influenced by:

Room shape

Simple rectangles are easier to plan than irregular spaces.

Tile size

Larger tiles can create more noticeable cuts around small spaces or obstacles.

Installation pattern

Straight-lay, staggered, diagonal and other patterns can produce different cutting requirements.

Tile design

Highly directional patterns may require additional planning to maintain visual continuity.

Installer experience

Good layout planning can reduce unnecessary cuts and waste.

Buying tiles for an entire house

Do not simply measure the entire house and buy one percentage.

Break the project into areas:

• Living room

• Dining

• Bedrooms

• Kitchen

• Bathrooms

• Hallways

• Staircases

• Balconies

• Outdoor areas

• Walls

Calculate each area separately.

This helps you understand exactly where each product will be used and reduces the risk of mixing up quantities.

What information should you give a tile supplier?

If you want a supplier to help you estimate quantities, provide:

• Room dimensions

• Floor plans where available

• Number of rooms

• Ceiling/wall heights for wall tiling

• Door and window dimensions

• Preferred tile sizes

• Preferred collections or styles

• Installation pattern

• Whether tiles are required for floors, walls or both

• Project location

For a large development, architectural drawings and a room schedule can make the process much more accurate.

Frequently asked questions

How many 60×60 tiles do I need for 24 square metres?

A 600×600 mm tile covers 0.36 m². For 24 m², you need 67 tiles before adding an allowance for cuts and breakage.

How many 60×120 tiles do I need for 24 square metres?

A 600×1200 mm tile covers 0.72 m². For 24 m², you need 34 tiles before adding an allowance.

How much tile wastage should I add?

There is no single percentage that works for every project. The allowance depends on room shape, tile size, pattern, cuts and installation conditions.

Should I keep leftover tiles?

Yes, where practical. Keeping a small quantity of the installed tile can be useful for future repairs, especially if the product may not remain available indefinitely.

Can a tile supplier calculate how many tiles I need?

A supplier can help with quantity planning when you provide accurate dimensions and project information. For complex projects, quantities should also be coordinated with the architect, contractor or installer.

Final thoughts

Calculating tile quantity is simple when you break it into steps:

Measure → calculate area → calculate tile coverage → divide → round up → add a reasonable allowance → confirm with the installation plan.

Do not order based on guesswork. A few minutes spent measuring and planning can prevent costly shortages, unnecessary waste and delays.

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