Tile Quantity & Cost Calculator

Tile Quantity Guide (UK)

What should I know about Calculating Tiles Needed?

Step 1: calculate area. Floor: length × width. Wall: length × height. Subtract: doors (~1.8m² each), windows. Bathroom: add all wall areas + floor. Subtract sanitaryware footprint (toilet, basin, bath) — about 2-3m² total. Step 2: add wastage. 10% standard for simple rectangular layouts. 15% for moderate complexity (one alcove, doorway angle). 20% for complex (diagonal layout, multiple obstacles, expensive tile where mistakes are costly). Step 3: divide by tile area. Round up to whole tiles, then add the waste percentage on top to arrive at the final quantity to order.

What's the key thing to understand about Tile Types and Costs (2026 UK)?

Ceramic: cheapest. £10-25/m². Good for walls. Less durable for high-traffic floors. Standard for budget bathroom walls. Porcelain standard: £20-40/m². Most common floor tile. Denser, harder, less porous than ceramic. Used widely for floors and walls. Porcelain premium: £40-80/m². Better appearance, wood-effect porcelain, anti-slip ratings, large format. Increasingly common in mid-range home renovations. Natural stone (slate, limestone, travertine): £40-150/m². Beautiful natural variation. Requires periodic sealing to protect against staining and moisture absorption, unlike glazed porcelain which needs none.

What do I need to know about Adhesive and Grout Quantities?

Tile adhesive: ready-mixed or powdered. Powdered cheaper for larger jobs. Quantity rule of thumb: 4-5 kg per m² (3-5mm tile bed). Specialist adhesive: rapid-set, flexible, large-format. £15-30 per 20kg bag. Brands: BAL, Mapei, Weber, Ardex. Grout: 1-2 kg per m² for most tile sizes/joints. More for smaller tiles or wider joints. Less for large-format tiles with narrow joints. Coloured grout: significantly more expensive than standard white/grey. £20-40 per 5kg bag for coloured. Special grouts: antimicrobial or epoxy formulations cost more still, but are worth it in wet areas like showers where standard grout can develop mould over time.

What's the difference between DIY and Professional?

DIY tile work: cost saving £30-60/m² in labour. 4-8 hours per m² for beginner. Faster with experience. Best for: simple straight layouts. Small areas (bathroom splashback, single wall). Areas where mistakes can be hidden. Avoid DIY for: wet rooms (waterproofing critical). Wall-floor junctions (need decoupling membrane). Large format tiles 600×1200mm (heavy, awkward, mistakes very visible). Expensive marble/stone where waste is costly. Tiler day rate (2026 UK): £200-350/day. Project pricing typically runs £30-60 per square metre for labour on a standard tiling job, more for large-format or complex layouts.

What do I need to know about Tile Layout and Cutting Waste?

The amount of waste allowance built into a tile quantity estimate depends heavily on the tile layout chosen, not just the room's area, which is why a simple area-divided-by-tile-size calculation on its own tends to under-order for more complex layouts. A straightforward grid layout, tiles laid square to the walls in straight rows, generally produces the least waste, since full tiles fill most of the area with only a single row of cuts needed around the room's perimeter. A diagonal layout, tiles set at 45 degrees to the walls, looks striking in many rooms but produces noticeably more waste, since every tile touching a wall or corner needs an angled cut, and off-cuts from a diagonal layout are less easily reused elsewhere in the room than the simpler rectangular off-cuts from a grid layout. A brick-bond or herringbone pattern, common with rectangular plank-style tiles, sits somewhere in between, needing a reasonable number of cuts at the start and end of each offset row. Complex rooms with multiple obstructions, such as a bathroom floor with a toilet pedestal and a shower tray cut-out, need extra waste allowance on top of whatever the chosen layout pattern already needs, since awkward cuts around curved or irregular fittings often can't be salvaged from a single straight off-cut the way a simple rectangular corner cut can.

What should I know about Choosing Grout Colour and Width?

Grout choice affects both the finished appearance of a tiled area and, to a smaller extent, the quantity needed, which this calculator's grout estimate accounts for alongside the adhesive quantity. Grout joint width is typically chosen based on tile size and the straightness of the tile's edges, with larger format tiles generally suited to narrower joints for a cleaner, more seamless look, while smaller tiles or tiles with slightly less precise, rectified edges often need a wider joint to look even and to accommodate normal size variation between individual tiles. Grout colour has a significant visual effect independent of the tile colour itself: a grout colour closely matched to the tile creates a more seamless, uniform look where the grout lines recede visually, while a contrasting grout colour deliberately emphasises the tile pattern and layout, which can look striking with mosaic or patterned tiles but will also make any slightly uneven cutting or spacing far more visible than a closely matched grout would. Darker grout colours are generally more practical in high-traffic or high-grime areas such as kitchen floors, since they show dirt and staining less readily over time than a pale or white grout, which can visibly discolour in grout lines well before the tiles themselves show any wear.

What should I know about Tile Trim and Edge Profiles?

Exposed tile edges — around a window reveal, at an external corner, or where tiling stops partway up a wall — need a trim profile rather than being left as a raw cut edge, both for appearance and to protect against chipping and water ingress. Tile trim comes in several common profiles: straight-edge or 'quarter round' trims give a simple rounded finish at an exposed edge; corner trims protect external corners in the same way they protect plasterboard corners; and bullnose tiles (a tile with one rounded factory edge) avoid the need for a separate trim piece but cost more and must be planned into the layout from the start. Trim is available in plastic, aluminium, and stainless steel, with plastic the cheapest and least durable, and stainless the most robust for high-wear or wet areas like a shower return wall. Trim needs to be bedded into the tile adhesive at the same time as the adjoining tiles, not added afterwards, so it must be ordered and planned alongside the tile quantity rather than as an afterthought — measure the total length of all exposed edges on the job (window reveals, external corners, top edge of part-height tiling) to calculate how many trim lengths (typically sold in 2.5m strips) are needed.

What do I need to know about Underfloor Heating and Tile Compatibility?

Tile is one of the best floor coverings for underfloor heating because it conducts and radiates heat efficiently and has a high thermal mass that evens out temperature fluctuations, but a few things need checking before tiling over UFH. The tile adhesive and grout must be flexible/rated for UFH use — standard rigid adhesives can crack as the floor expands and contracts through daily heating cycles, so look for adhesives specifically marked as flexible or suitable for underfloor heating. A deformation/flexible decoupling membrane is often recommended between the subfloor (especially over a heated screed or board system) and the tiles, which accommodates minor movement and reduces the risk of cracked tiles or grout lines over time. Large-format tiles are more prone to cracking from thermal movement than smaller tiles, so very large porcelain slabs over UFH benefit particularly from a decoupling membrane and a premium flexible adhesive. As with other floor coverings, the heating system should be run through a commissioning cycle and then switched off before tiling, and brought back up gradually over several days after the adhesive and grout have fully cured (typically allow the full cure period stated by the adhesive manufacturer, often 1-2 weeks, before applying heat) to avoid thermal shock to the new tiling.

Worked Example: Tiling a 4m x 3m Bathroom Floor

A bathroom floor measuring 4m by 3m has an area of 12m². Using 300mm x 300mm (0.09m²) floor tiles, the baseline number of tiles needed is 12 ÷ 0.09 ≈ 134 tiles. Adding a standard 10% waste allowance for cuts, breakages and awkward edges around the bath, toilet and door threshold brings the practical order quantity to roughly 147-148 tiles, which most suppliers round up to full boxes — if tiles come in boxes of 11 (a common pack size for 300mm tiles), that means ordering 14 boxes (154 tiles) rather than 13, to avoid a mid-job shortfall. For adhesive, standard floor tile adhesive at roughly 3-5kg per m² means this floor needs about 36-60kg, typically two to three 20kg bags, and grout at around 0.5-1kg per m² for a 3mm joint width needs roughly 6-12kg, usually one standard 5-10kg tub.