Tile Calculator UK
Work out how many wall or floor tiles you need from the area you are actually tiling and the real tile dimensions. Extra allowance starts at 0%, and box rounding is optional.
Calculate your tile quantity
Use a known tiled area, or enter simple surface dimensions. For irregular floors or several wall sections, total the area first with the Floor Area Calculator or Wall Area Calculator.
How the tile calculation works
The base quantity uses the actual tile dimensions you enter. Extra allowance is applied only when you choose it, then the final quantity rounds up to whole tiles or whole boxes.
Worked example
18 m² with 600 × 300 mm tiles = 100 theoretical tiles.
At 0% extra, that remains 100 whole tiles. If your box contains 6 tiles, the purchase quantity rounds to 17 boxes / 102 tiles.
Why this calculator starts at 0% extra
Many UK tile calculators automatically add 10% for cuts and breakage. That can be a useful planning convention, but it is not a universal law. Room geometry, tile format, laying pattern, batch availability and the number of awkward cuts all affect the extra quantity you may want. This calculator keeps the percentage visible and under your control instead of silently adding it.
For a simple floor, length × width gives area. For walls, calculate each wall section and add them. Deduct significant openings only once.
Use the tile dimensions shown for the product you intend to buy. The calculator does not assume a “standard” 300, 450 or 600 mm tile.
If the supplier sells by box, enter the real tiles-per-box quantity. The calculator rounds up and shows the nominal surplus.
Area maths is not a tile-layout drawing
Dividing area by tile face area is a strong quantity starting point, but it cannot know where every cut lands. Grout joints, edge cuts, niches, diagonal or herringbone layouts and tile orientation are layout decisions. Use the extra allowance field deliberately after considering the real pattern and room.
Should grout joints be added to the tile dimensions?
Not in this calculator. It estimates the number of physical tiles required from their face area, then leaves layout complexity to the visible allowance. Treating the grout gap as though it makes each tile larger can understate the number of physical tiles in some jobs and still does not model actual edge cuts.
Tile quantity vs adhesive and grout
This page owns tile count from a known tiled area and tile size. Adhesive consumption depends on the actual adhesive, substrate and application, while grout consumption depends on tile thickness and joint geometry. Use the separate Tile Adhesive Calculator and Grout Calculator rather than mixing those assumptions into the tile count.
Planning estimate only. Check the finished layout, product dimensions, batch/box quantity and supplier stock before ordering. Keep replacement tiles from the same batch where that matters to the chosen product.
Current UK comparison checks
Current UK calculators from Toolstation and Wickes both use area and tile size as the core quantity inputs. They also illustrate why this tool keeps extra allowance visible rather than hidden: both introduce an extra-for-waste convention, while this calculator lets you choose the percentage yourself.
Frequently asked questions
How many tiles do I need per square metre?
It depends entirely on the tile dimensions. Enter the real tile length and width above and the calculator shows the area per tile and theoretical count.
Should I use floor area for wall tiles?
No. Wall and floor surfaces are separate areas. Measure the actual surface you are tiling.
Should I buy by tile or by box?
Use the supplier’s sales unit. If tiles are sold only by box, enter the actual tiles-per-box figure and the calculator will round up to whole boxes.