Why Getting the Quantity Right Matters

Tile quantity is one of those details that seems simple until it goes wrong. Run short halfway through a job and you face a delay while more are ordered. There is also a real chance the new tiles come from a different production batch with a slightly different shade. That mismatch can be visible across a floor and there is no easy fix once the first tiles are down. Over-order by a wide margin and you have paid for boxes of tiles you will never use, along with the cost of delivery and the hassle of returns.

The answer is a proper calculation that includes a sensible wastage allowance. Wastage is not waste in the careless sense. It covers the tiles you cut to fit edges and corners, the odd tile that chips during handling or fitting and a small reserve kept back for future repairs. Get this figure right and your project runs smoothly from the first tile to the last.

The Basic Calculation, Step by Step

The core method is straightforward. Measure the area you are tiling, divide by the area of a single tile then add your wastage allowance. Working in metres keeps everything simple because tiles are usually sold and priced by the square metre in the UK.

Step one is to measure the area. For a floor, multiply the length by the width to get the square metres. For a wall, multiply the width by the height. If the room is an awkward shape, split it into rectangles, work out each one then add them together. Step two is to subtract any large areas you are not tiling, such as a shower tray footprint or a run of fitted units. Step three is to add wastage, typically ten percent for a straight layout and fifteen percent for a diagonal or patterned one. Step four is to round up to full boxes, since tiles are sold by the box rather than the single tile.

How Much Wastage to Add

Wastage is not a fixed number. The right allowance depends on the layout, the tile size and how complex the room is. As a rule, the more cuts a layout needs the more wastage you should add. The chart below shows the allowances we recommend for the most common situations.

What Changes Your Wastage Allowance

Six factors decide whether you sit at the lower or the higher end of the range. Weigh these up before you settle on a number.

If you would rather we did the sums with you, our Bedford Tiles page explains how to share your measurements and get an accurate quantity and price for your floors or walls before you order.

A Worked Example for a Bedford Bathroom

Imagine a typical Bedford bathroom floor measuring 2.4 metres by 1.8 metres. Multiplying those gives 4.32 square metres. There is a small shower tray taking up around 0.7 square metres that will not be tiled, so the tiled area drops to roughly 3.6 square metres. The layout is a simple straight lay, so a ten percent wastage allowance is right, which brings the figure to about 3.96 square metres. Rounding up to full boxes, you would order 4 square metres or the next full box above it.

Now picture the same room laid on the diagonal for a more decorative finish. The extra cuts around the perimeter mean a fifteen percent allowance is wiser, taking the figure to around 4.14 square metres and very likely one more box. This is exactly why the layout has to be decided before the order is placed rather than after.

Why Ordering From One Batch Matters

Tiles are made in production runs called batches. The shade can drift very slightly from one batch to the next. That is why calculating the full quantity in advance and ordering it in one go is so important. If you under-order and return for more, there is no guarantee the top-up will match. Ordering the complete amount, wastage and spares included, protects the look of the finished floor or wall. Our guide to Calibrated Tiles Explained explains how batch and size consistency affects the fit and finish of your tiles.

Getting the quantity right is one clear stage in a larger process. To see where it sits alongside choosing, sampling and fitting, follow the Bedford Tile Project Timeline and the complete The Bedford Tile Buying Journey, which map out every step from first idea to finished room.

For the wider picture on planning, comparing and buying tiles in the area, the Bedford Tile Hub pulls together every guide in this series so you can plan your project with confidence from start to finish.

Ready to Order the Right Amount?

The safest way to avoid both a shortfall and a costly over-order is to have your quantity checked before you buy. Bring your room measurements and your chosen layout to our Elstow showroom and we will confirm the figures, wastage included, so you order once and order right.

To check coverage per box, lead times or pricing, call the team on 01234 348 590 or request a quote online. A few minutes on the maths now keeps your project on track later.