Ordering the wrong number of tiles is one of the most common and costly tiling mistakes in UK homes. Order too few and the project stalls mid-installation. Order too many and money is wasted on unused stock.
The exact number of tiles needed is calculated by measuring the total surface area in m², dividing by the area of one tile in m², rounding up to the nearest whole number, and adding a 10–15% wastage allowance based on the laying pattern chosen.
Accurate tile calculation covers 5 key decisions — measuring floors, walls, and irregular room shapes correctly; converting tile sizes from mm to m²; selecting the right wastage allowance for straight, brick bond, herringbone, or diagonal lay; accounting for grout joint width on large surface areas; and ordering all boxes from the same batch number in a single transaction.
A standard UK bathroom requires tiles for 4–5m² of floor space and 15–18m² of wall space. A standard UK kitchen requires tiles for 8–12m² of floor and 1.5–2.5m² of splashback. Hallways, living rooms, conservatories, and utility rooms each carry different average surface areas, tile format requirements, and wastage allowances.
This guide covers every step of the tile quantity calculation process, from first measurement to final box count, for every room type and tile size commonly used in homes.
How Do You Calculate How Many Tiles You Need?
Tile quantity is calculated by measuring the total surface area in m², dividing by the area of one tile in m², rounding up to the nearest whole number, and adding 10–15% for wastage, cuts, and breakages.
The 5 steps to calculate tile quantity are given below:
- Measure the Total Area to Tile: Multiply the surface length (m) by the surface width (m) to produce the total area in m². For a bathroom floor measuring 3.5m × 2.2m, the total area is 7.7m².
- Work Out the Area of One Tile: Divide the tile length (mm) and tile width (mm) each by 1,000 to convert to metres, then multiply both values together. A 600mm × 300mm tile converts to 0.6m × 0.3m, giving a single tile area of 0.18m².
- Divide Surface Area by Tile Area: Divide the total surface area (m²) by the single tile area (m²) to get the raw tile count. Dividing 7.7m² by 0.18m² gives 42.7 tiles.
- Round Up to Whole Tiles: Round the raw tile count up to the nearest whole number, as partial tiles require a full tile to complete. 42.7 tiles rounds up to 43 tiles.
- Add Extra Tiles for Wastage, Cuts, and Breakages: Multiply 43 by 1.10 for straight lay (10%), by 1.10–1.15 for brick bond lay (10–15%), or by 1.15 for diagonal or herringbone lay (15%). A straight lay gives 47.3, rounded up to a final order quantity of 48 tiles.
Example: A bathroom floor measuring 3.5m × 2.2m produces a total area of 7.7m². A 600mm × 300mm tile covers 0.18m² per tile. Dividing 7.7m² by 0.18m² gives 42.7 tiles, rounded up to 43 tiles. Applying a 10% straight-lay wastage allowance gives 47.3, rounded up to a final order quantity of 48 tiles.
How Do You Measure a Floor, Wall, or Room for Tiles?
A floor, wall, or room is measured for tiles by recording the length and width of each surface in metres (m) and multiplying both values to produce the total area in square metres (m²). Accurate measurement reduces over-ordering and prevents tile shortages mid-installation.
How to Measure a Rectangular Floor
A rectangular floor area is measured by multiplying the floor length (m) by the floor width (m) to produce the total area in m². Measure at the longest and widest points of the floor, including any skirting board depth.
- Record length: Measure the longest wall from end to end in metres.
- Record width: Measure the shortest wall from end to end in metres.
- Multiply both values: Length (m) × Width (m) = Total floor area (m²).
Example: A kitchen floor measuring 4.2m × 3.8m produces a total floor area of 15.96m².
How to Measure Walls
A wall area is measured by multiplying the wall width (m) by the wall height (m), measured from the floor to the intended tile height or ceiling. Measure each wall individually where multiple walls are being tiled.
- Record width: Measure the wall from left to right at its widest point in metres.
- Record height: Measure from the floor to the intended tile finish height in metres.
- Multiply both values: Width (m) × Height (m) = Total wall area (m²).
- Add all walls together: Calculate each wall area separately and sum the figures for the total tiled wall area in m².
Example: A bathroom with 2 walls measuring 2.4m × 2.2m each and 2 walls measuring 1.8m × 2.2m each produces a total wall area of (2 × 5.28m²) + (2 × 3.96m²) = 18.48m².
How to Measure Around Doors, Windows, Baths, and Units
The area of fixed features — including doors, windows, baths, shower trays, and kitchen units — is subtracted from the total surface area in m² to produce the net tiled area. Skipping this step results in over-ordering tiles.
The 4 deduction steps for fixed features are given below:
- Doors: Measure the door opening width (m) × door opening height (m) and subtract the result from the total wall area.
- Windows: Measure the window width (m) × window height (m) and subtract the result from the total wall area.
- Baths and shower trays: Measure the bath or tray length (m) × width (m) and subtract the result from the total floor area.
- Kitchen and bathroom units: Measure the unit footprint length (m) × width (m) and subtract the result from the total floor area.
Example: A bathroom wall of 8.64m² contains a window measuring 0.6m × 0.5m (0.30m²). The net tiled wall area is 8.64m² − 0.30m² = 8.34m².
How to Measure Awkward or Uneven Room Shapes
An irregularly shaped room is measured by dividing the total floor or wall area into separate rectangles, calculating each rectangle’s area in m², and adding all figures together. L-shaped rooms, en-suites with recesses, and rooms with chimney breasts all require this method.
The 3 steps to measure an awkward room shape are given below:
- Divide the surface: Split the floor or wall into the smallest number of non-overlapping rectangles that cover the entire surface.
- Measure each rectangle: Record the length (m) and width (m) of each rectangle and multiply both values to get the area in m².
- Add all areas together: Sum all rectangle areas to produce the total surface area in m².
Example: An L-shaped hallway floor is divided into 2 rectangles — 3.0m × 1.2m (3.6m²) and 1.5m × 1.0m (1.5m²). The total floor area is 3.6m² + 1.5m² = 5.1m².
How Many Tiles Fit in 1 Square Metre?
The number of tiles that fit in 1m² is calculated by dividing 1 by the area of a single tile in m². Tile size directly determines tile quantity per m², and larger tiles cover more area per unit than smaller tiles.
Tile Size Examples by Square Metre
The number of tiles per m² decreases as tile size increases, ranging from 1 tile per m² for 1000mm × 1000mm formats down to 100 tiles per m² for 100mm × 100mm mosaic formats. The figures below are calculated without grout joint allowance.
The tile quantities per m² for the most common UK tile sizes are given below:
| Tile Size (mm) | Tile Area (m²) | Tiles Per m² |
| 100 × 100 | 0.01m² | 100 tiles |
| 150 × 150 | 0.0225m² | 45 tiles |
| 200 × 200 | 0.04m² | 25 tiles |
| 300 × 300 | 0.09m² | 12 tiles |
| 300 × 600 | 0.18m² | 6 tiles |
| 400 × 400 | 0.16m² | 7 tiles |
| 600 × 600 | 0.36m² | 3 tiles |
| 600 × 1200 | 0.72m² | 2 tiles |
| 800 × 800 | 0.64m² | 2 tiles |
| 1000 × 1000 | 1.00m² | 1 tile |
Grout joint width adds 2–5mm between each tile, which reduces the number of full tiles that fit within 1m² by 1–3% depending on tile format and joint size selected.
How to Convert Tile Size Into Square Metres?
A tile size is converted into square metres by dividing the tile length (mm) by 1,000 and the tile width (mm) by 1,000, then multiplying both metre values together. All UK tile dimensions are listed in millimetres (mm) and require conversion before any area calculation.
The 3 steps to convert tile size into m² are given below:
- Convert tile length: Divide the tile length in mm by 1,000 to produce the length in metres. A 600mm tile length converts to 0.6m.
- Convert tile width: Divide the tile width in mm by 1,000 to produce the width in metres. A 300mm tile width converts to 0.3m.
- Multiply both values: Multiply the converted length (m) by the converted width (m) to produce the tile area in m². 0.6m × 0.3m = 0.18m².
The tiles-per-m² figure is then calculated by dividing 1 by the tile area in m².
Example: A 600mm × 300mm tile has an area of 0.18m². Dividing 1 by 0.18 gives 5.56 tiles per m², rounded up to 6 tiles per m².
How Many Extra Tiles Should You Order?
Always order 10–15% more tiles than your calculated quantity to cover wastage, cuts, and breakages. The exact percentage depends on the laying pattern chosen.
Extra Tiles for Straight Lay Patterns
A straight lay pattern needs a 10% extra tile allowance. Straight lay tiles run parallel to the room walls, producing the fewest cuts of all laying patterns.
The 3 steps to calculate extra tiles for a straight lay are given below:
- Calculate base tile quantity: Divide the total surface area (m²) by the single tile area (m²) and round up to the nearest whole number.
- Add 10% wastage: Multiply the base tile quantity by 1.10.
- Round up: Always round the final number up to the nearest whole tile.
Example: A base quantity of 43 tiles gives 43 × 1.10 = 47.3, rounded up to 48 tiles.
Extra Tiles for Diagonal, Brick Bond, and Herringbone Patterns
Diagonal, brick bond, and herringbone patterns need a 15% extra tile allowance. These patterns create more cuts and off-cuts than straight lay, as tiles are placed at angles or offset positions.
The wastage allowances for the 3 most common patterned lays are given below:
- Brick Bond Lay: Tiles offset by 50% on each row. Add 10–15% wastage (multiply by 1.10–1.15).
- Herringbone Lay: Tiles set at 90° alternating angles. Add 15% wastage (multiply by 1.15).
- Diagonal Lay: Tiles set at 45° to the walls. Add 15% wastage (multiply by 1.15).
Example: A base quantity of 43 tiles on a herringbone lay gives 43 × 1.15 = 49.45, rounded up to 50 tiles.
How Many Spare Tiles Should You Keep After Installation?
Keep 5–10% of your total tile order as spares after installation. Spare tiles from the same batch guarantee a perfect colour and texture match for any future repairs.
The 3 reasons to keep spare tiles after installation are given below:
- Dye lot variation: Tiles are made in batches, and colour or texture varies between batches. A tile from a different batch looks visibly different on a repaired area.
- Accidental damage: Dropped objects and impact fractures are the most common causes of tile damage in UK homes. Having spares ready avoids a full retile.
- Discontinued ranges: Most UK tile ranges are discontinued within 2–5 years, making exact replacements unavailable without retained stock.
Store spare tiles flat in their original packaging in a dry indoor space to prevent moisture damage and edge chipping.
Do Grout Lines Affect How Many Tiles You Need?
Grout lines reduce the number of tiles needed, as grout joint width takes up part of the surface area that would otherwise be covered by a tile. The wider the grout joint, the fewer tiles are required to cover the same surface.
The 3 most common grout joint widths and their effect on tile quantity are given below:
- 2–3mm Joint (Rectified Tiles): Produces a minimal reduction in tile quantity. No separate deduction is needed for areas under 30m².
- 5mm Joint (Standard Wall and Floor Tiles): Reduces tile quantity by 1–2% on areas over 20m². A standard 10% wastage allowance covers the difference.
- 8–10mm Joint (Rustic or Handmade Tiles): Reduces tile quantity by 3–5% on areas over 30m². A separate deduction of 3–5% is recommended for large surface areas.
For most UK home tiling projects, a standard 10% wastage allowance already absorbs the reduction in tile count caused by grout lines. A separate grout line deduction is only necessary on large surface areas of 30m² or more, where a grout joint of 8mm or above is used.
Does Tile Layout Change the Number of Tiles You Need?
Tile layout directly changes the number of tiles needed, as patterns with angled or offset cuts produce more wastage than straight layouts. Choosing a more complex pattern increases tile quantity by up to 15%.
The 4 most common tile layouts and their effect on tile quantity are given below:
- Straight Lay (Grid Pattern): Tiles run parallel to the room walls with aligned grout joints. Produces the least wastage of all layouts. Add 10% to the base tile quantity.
- Brick Bond (Offset Pattern): Tiles are offset by 50% on each row, similar to a brick wall. Produces more edge cuts than straight lay. Add 10–15% to the base tile quantity.
- Herringbone Pattern: Tiles are set at 90° alternating angles, producing a high volume of angled cuts at room edges and perimeters. Add 15% to the base tile quantity.
- Diagonal Pattern: Tiles are set at 45° to the room walls, producing the highest volume of edge cuts of all standard layouts. Add 15% to the base tile quantity.
Larger format tiles on complex layouts produce more wastage per cut than smaller tiles, as each off-cut covers a greater surface area. A 600mm × 600mm tile on a diagonal layout generates more wasted material per cut than a 300mm × 300mm tile on the same layout.
How Many Boxes of Tiles Do You Need?
The number of tile boxes needed is calculated by dividing the total tile quantity by the number of tiles per box, then rounding up to the nearest whole box. Most UK tile boxes list coverage in m² on the packaging, making the calculation straightforward.
How to Use Pack Coverage
Pack coverage is the total area in m² that one box of tiles covers, listed on the tile packaging or product page. Dividing the total surface area (m²) by the pack coverage (m²) gives the number of boxes needed before wastage.
The 3 steps to calculate boxes using pack coverage are given below:
- Find the pack coverage: Locate the m² coverage per box on the tile packaging or product listing.
- Divide total area by pack coverage: Divide the total surface area (m²) by the pack coverage per box (m²).
- Add wastage allowance: Multiply the result by 1.10 for straight lay or 1.15 for diagonal, herringbone, or brick bond layouts.
Example: A 12m² floor with a pack coverage of 1.44m² per box requires 12 ÷ 1.44 = 8.33 boxes. Adding 10% wastage gives 9.16, rounded up to 10 boxes.
How to Round Up to Full Boxes
Always round up to the nearest full box, as tile suppliers sell boxes as complete units and do not split boxes. Rounding down leaves the installation short of tiles mid-project.
- Never round down: A fraction above a whole box number always requires one full additional box.
- Check tiles per box: Multiply the number of boxes by tiles per box to confirm the total tile count meets or exceeds the required quantity including wastage.
Why Batch Numbers and Shade Variation Matter
Tiles from different production batches vary in colour, shade, and texture by up to 5%, making batch number matching essential when ordering multiple boxes. This variation is known as shade variation or dye lot difference.
- Order all boxes at once: Ordering all required boxes in a single transaction guarantees the same batch number across the entire order.
- Check batch numbers on delivery: Confirm all boxes share the same batch number before installation begins, as mixing batches produces visible shade differences on the finished surface.
- Order one extra box: Ordering one additional box from the same batch provides a matching spare for future repairs, as tile ranges are discontinued within 2–5 years on average in the UK.
How Do You Calculate Tile Quantity for Common Projects?
Tile quantity for common projects is calculated by measuring the specific surface area in m², dividing by the single tile area in m², and adding the correct wastage allowance for the chosen laying pattern. Each room type has different surface shapes, fixed features, and typical tile formats that affect the final tile count.
The 6 most common UK tiling projects and their tile quantity calculations are given below:
- Bathroom Floor: Measure the full floor length (m) × width (m). Subtract the bath or shower tray footprint. Add 10% wastage for straight lay or 15% for herringbone or diagonal lay. A standard UK bathroom floor averages 4–5m².
- Bathroom Wall: Measure each wall width (m) × tile height (m) individually. Subtract window and door openings. Add all wall areas together and apply a 10% wastage allowance. A full bathroom wall tile covering averages 15–18m².
- Kitchen Floor: Measure the full kitchen floor length (m) × width (m). Subtract fixed unit footprints and island bases. Add 10% wastage for straight lay or 15% for diagonal lay. A standard UK kitchen floor averages 8–12m².
- Kitchen Splashback: Measure the splashback width (m) × splashback height (m) for each section. Subtract socket and switch cut-outs. Add 10% wastage. A standard UK kitchen splashback averages 1.5–2.5m².
- Hallway Floor: Measure the full hallway length (m) × width (m). Divide L-shaped or irregular hallways into separate rectangles and add the areas together. Add 15% wastage for herringbone or diagonal lay, as hallway tiles are most commonly laid on pattern in UK homes.
- Living Room Floor: Measure the full room length (m) × width (m). Subtract fireplace hearth areas. Add 10% wastage for straight lay or 15% for pattern lay. A standard UK living room floor averages 15–20m².
How Many Tiles Do You Need for Different Tile Sizes?
The number of tiles needed decreases as tile size increases, as larger tiles cover more area per unit than smaller tiles. The same 10m² surface requires 1,000 tiles at 100mm × 100mm but only 14 tiles at 800mm × 800mm.
The tile quantities required per 10m² for the most common UK tile sizes are given below:
| Tile Size (mm) | Tile Area (m²) | Tiles Per m² | Tiles Per 10m² (inc. 10% wastage) |
| 100 × 100 | 0.01m² | 100 tiles | 1,100 tiles |
| 150 × 150 | 0.0225m² | 45 tiles | 495 tiles |
| 200 × 200 | 0.04m² | 25 tiles | 275 tiles |
| 300 × 300 | 0.09m² | 12 tiles | 132 tiles |
| 300 × 600 | 0.18m² | 6 tiles | 66 tiles |
| 400 × 400 | 0.16m² | 7 tiles | 77 tiles |
| 600 × 600 | 0.36m² | 3 tiles | 33 tiles |
| 600 × 1200 | 0.72m² | 2 tiles | 22 tiles |
| 800 × 800 | 0.64m² | 2 tiles | 22 tiles |
| 1000 × 1000 | 1.00m² | 1 tile | 11 tiles |
The 3 key rules for selecting tile size and calculating quantity are given below:
- Large Format Tiles in Small Rooms: Large format tiles (600mm × 600mm and above) in rooms under 5m² produce a high volume of edge cuts, increasing wastage to 15–20%. Add a 15% wastage allowance for large format tiles in small rooms.
- Small Format Tiles on Complex Layouts: Small format tiles (300mm × 300mm and below) on herringbone or diagonal layouts produce more individual cuts but less wasted material per cut. A standard 10–15% wastage allowance applies.
- Rectangular Tiles on Offset Layouts: Rectangular tiles such as 300mm × 600mm on a brick bond layout require a 10–15% wastage allowance, as the offset produces additional cuts at room edges and perimeters.
What Are the Most Common Mistakes When Calculating Tile Quantity?
The most common mistakes when calculating tile quantity are under-ordering tiles, ignoring wastage allowances, and failing to account for fixed features, laying patterns, and batch number differences. Each mistake results in either a tile shortage mid-installation or a visible mismatch on the finished surface.
The 7 most common tile quantity calculation mistakes are given below:
- Not Adding a Wastage Allowance: Ordering only the base tile quantity without adding 10–15% for cuts, breakages, and fitting errors leaves the installation short of tiles before completion.
- Rounding Down Instead of Up: Rounding the tile count down to the nearest whole number produces a shortage, as partial tiles are not sold as individual units. Always round up.
- Not Subtracting Fixed Features: Failing to subtract baths, shower trays, kitchen units, doors, and windows from the total surface area produces an overstated tile quantity and inflated order cost.
- Using the Wrong Wastage Allowance for the Laying Pattern: Applying a 10% wastage allowance to a diagonal or herringbone layout, which requires 15%, results in a tile shortage at room edges and perimeters.
- Measuring in Millimetres Instead of Metres: Calculating surface area in mm² instead of m² produces a tile quantity figure 1,000,000 times larger than the correct result. Always convert mm to m before calculating.
- Ordering Tiles from Different Batches: Ordering additional tiles after the initial purchase risks a different batch number, producing a visible colour and shade mismatch of up to 5% on the finished surface.
- Not Keeping Spare Tiles After Installation: Discarding leftover tiles after installation removes the only source of batch-matched replacements, as tile ranges are discontinued within 2–5 years on average in the UK.
Should You Use a Tile Calculator or Calculate Manually?
A tile calculator is faster for standard rectangular rooms, while manual calculation is more accurate for irregular room shapes, complex laying patterns, and rooms with multiple fixed features. Both methods produce reliable results when the correct measurements and wastage allowances are applied.
When Is a Tile Calculator Useful?
A tile calculator is most useful for straightforward, rectangular rooms with a single tile format and a straight lay pattern. Entering the room length, room width, and tile size produces an instant tile quantity without manual arithmetic.
The 3 situations where a tile calculator produces the most reliable results are given below:
- Rectangular Rooms: Rooms with 4 straight walls and no alcoves, recesses, or bay windows produce accurate results in a tile calculator without manual adjustment.
- Single Tile Format: Projects using one tile size throughout produce a direct tile quantity from a calculator without splitting calculations across multiple tile formats.
- Standard Laying Patterns: Straight lay and brick bond patterns on rectangular surfaces produce reliable tile quantities from a calculator, as wastage allowances are fixed at 10–15%.
When Is Manual Checking More Accurate?
Manual calculation is more accurate for L-shaped rooms, rooms with multiple fixed features, mixed tile formats, and complex laying patterns. Tile calculators apply a single room dimension and a fixed wastage percentage, which underestimates tile quantity on irregular surfaces.
The 3 situations where manual calculation produces more accurate results are given below:
- Irregular Room Shapes: L-shaped rooms, en-suites with recesses, and rooms with chimney breasts require the surface to be divided into separate rectangles and calculated individually. A tile calculator applies a single dimension and misses the irregular sections.
- Multiple Fixed Features: Rooms with baths, shower trays, kitchen units, and windows require individual area deductions that most tile calculators do not perform automatically.
- Mixed Tile Formats: Projects combining large format floor tiles with smaller mosaic or wall tiles require separate calculations for each tile format, which a single tile calculator input field does not support.
Do Tile Calculators Account for Grout and Wastage?
Most tile calculators include a standard 10% wastage allowance but do not automatically adjust for grout joint width, laying pattern complexity, or large format tiles in small rooms. Always verify the wastage percentage applied by the calculator before placing a tile order.
The 3 limitations of tile calculators on grout and wastage are given below:
- Fixed Wastage Percentage: Most tile calculators apply a fixed 10% wastage allowance regardless of laying pattern. Diagonal and herringbone patterns require 15%, which must be added manually to the calculator output.
- No Grout Joint Deduction: Tile calculators do not deduct grout joint width from the surface area. On large surfaces of 30m² or more with an 8–10mm grout joint, a manual deduction of 3–5% produces a more accurate tile quantity.
- No Large Format Adjustment: Tile calculators do not increase wastage allowance for large format tiles (600mm × 600mm and above) in small rooms under 5m², where edge cuts increase wastage to 15–20%.
How Many Tiles Do You Need for a Bathroom?
A standard UK bathroom requires tiles for 4–5m² of floor space and 15–18m² of wall space, calculated by measuring each surface in m², subtracting fixed features, and adding a 10–15% wastage allowance.
The 3 surface areas to measure in a standard UK bathroom are given below:
- Bathroom Floor: Measure the full floor length (m) × width (m) and subtract the bath or shower tray footprint in m². Add 10% wastage for straight lay or 15% for herringbone or diagonal lay.
- Bathroom Walls: Measure each wall width (m) × tile height (m) individually and subtract window openings, door openings, and the bath panel area. Add all wall areas together and apply a 10% wastage allowance.
- Shower Enclosure: Measure each shower wall width (m) × height (m) and add all shower wall areas together. Apply a 10% wastage allowance. UK shower enclosures average 2.5–3.5m² of tiled wall area.
The tile quantities for a standard UK bathroom by tile size are given below:
| Tile Size (mm) | Floor (5m²) inc. 10% | Walls (17m²) inc. 10% | Total Tiles |
| 150 × 150 | 165 tiles | 556 tiles | 721 tiles |
| 300 × 300 | 62 tiles | 208 tiles | 270 tiles |
| 300 × 600 | 31 tiles | 104 tiles | 135 tiles |
| 600 × 600 | 17 tiles | 52 tiles | 69 tiles |
Example: A bathroom floor of 2.5m × 2.0m (5.0m²) with a bath footprint of 1.7m × 0.75m (1.275m²) gives a net floor area of 3.725m². Four walls totalling 17m², minus a window (0.30m²) and door opening (1.6m²), give a net wall area of 15.1m². Using 300mm × 600mm tiles (0.18m²), the floor requires 24 tiles and the walls require 93 tiles, giving a total order quantity of 117 tiles.
How Many Tiles Do You Need for a Kitchen?
A standard UK kitchen requires tiles for 8–12m² of floor space and 1.5–2.5m² of splashback wall space, calculated by measuring each surface in m², subtracting fixed unit footprints, and adding a 10–15% wastage allowance.
The 3 surface areas to measure in a standard UK kitchen are given below:
- Kitchen Floor: Measure the full floor length (m) × width (m) and subtract fixed unit footprints, kitchen islands, and appliance bases in m². Add 10% wastage for straight lay or 15% for diagonal or herringbone lay.
- Kitchen Splashback: Measure each splashback section width (m) × height (m) and subtract socket and switch cut-outs. Add all splashback areas together and apply a 10% wastage allowance. A standard UK kitchen splashback averages 1.5–2.5m².
- Kitchen Walls: Measure each wall width (m) × tile height (m) individually and subtract window openings, door openings, and wall unit bases. Add all wall areas together and apply a 10% wastage allowance.
The tile quantities for a standard UK kitchen by tile size are given below:
| Tile Size (mm) | Floor (10m²) inc. 10% | Splashback (2m²) inc. 10% | Total Tiles |
| 300 × 300 | 122 tiles | 25 tiles | 147 tiles |
| 300 × 600 | 61 tiles | 13 tiles | 74 tiles |
| 400 × 400 | 69 tiles | 14 tiles | 83 tiles |
| 600 × 600 | 31 tiles | 7 tiles | 38 tiles |
Example: A kitchen floor of 4.0m × 3.0m (12m²) with fixed unit footprints totalling 2.0m² gives a net floor area of 10m². A splashback measuring 2.4m × 0.6m gives a splashback area of 1.44m². Using 300mm × 600mm tiles (0.18m²), the floor requires 61 tiles and the splashback requires 9 tiles, giving a total order quantity of 70 tiles.
How Many Tiles Do You Need for Other Rooms in Your Home?
Tile quantity for other rooms is calculated by measuring the full surface area in m², subtracting fixed features, and adding a 10–15% wastage allowance based on the laying pattern selected. The most commonly tiled rooms in UK homes beyond bathrooms and kitchens are hallways, living rooms, and conservatories.
The 4 most commonly tiled rooms and their tile quantity calculations are given below:
- Hallway Floor: Measure the full hallway length (m) × width (m) and divide L-shaped or irregular hallways into separate rectangles. Add all section areas together and apply a 15% wastage allowance, as hallway tiles in UK homes are most commonly laid in herringbone or diagonal patterns. A standard UK hallway floor averages 4–6m².
- Living Room Floor: Measure the full room length (m) × width (m) and subtract fireplace hearth areas and fixed furniture bases. Add 10% wastage for straight lay or 15% for pattern lay. A standard UK living room floor averages 15–20m².
- Conservatory Floor: Measure the full conservatory floor length (m) × width (m) and subtract door thresholds and fixed base units. Add 10% wastage for straight lay or 15% for diagonal lay. A standard UK conservatory floor averages 8–12m².
- Utility Room Floor: Measure the full floor length (m) × width (m) and subtract fixed appliance bases and unit footprints. Add 10% wastage for straight lay. A standard UK utility room floor averages 3–5m².
The tile quantities for other UK rooms by tile size are given below:
| Tile Size (mm) | Hallway (5m²) inc. 15% | Living Room (17m²) inc. 10% | Conservatory (10m²) inc. 10% |
| 300 × 300 | 64 tiles | 208 tiles | 122 tiles |
| 300 × 600 | 32 tiles | 104 tiles | 61 tiles |
| 600 × 600 | 16 tiles | 52 tiles | 31 tiles |
| 600 × 1200 | 8 tiles | 26 tiles | 16 tiles |
Example: A living room floor measuring 5.0m × 3.4m (17m²) with a fireplace hearth of 1.2m × 0.4m (0.48m²) gives a net floor area of 16.52m². Using 600mm × 600mm tiles (0.36m²), the base tile quantity is 45.9, rounded up to 46 tiles. Adding 10% straight lay wastage gives 50.6, rounded up to a final order quantity of 51 tiles.
How Do I Make Sure I Order the Right Number of Tiles?
The right number of tiles is ordered by measuring the surface area accurately, applying the correct wastage allowance for the laying pattern, rounding up to whole boxes, and ordering all tiles from the same batch in a single transaction.
The 6 steps to ensure the correct tile order quantity are given below:
- Measure Every Surface Accurately: Measure the full length (m) × width (m) of every surface to be tiled. Divide irregular rooms into separate rectangles and subtract all fixed features including baths, units, and window openings.
- Apply the Correct Wastage Allowance: Add 10% for straight lay, 10–15% for brick bond, and 15% for diagonal or herringbone lay. Increase the allowance to 15–20% for large format tiles (600mm × 600mm and above) in rooms under 5m².
- Round Up to Whole Tiles and Full Boxes: Always round up the tile count to the nearest whole tile and the box count to the nearest full box. Tile suppliers do not split boxes or sell individual tiles.
- Check the Pack Coverage: Confirm the m² coverage per box on the product listing before ordering. Divide the total surface area (m²) by the pack coverage (m²) and round up to the nearest full box.
- Order All Boxes in a Single Transaction: Ordering all required boxes at once guarantees the same batch number across the entire order, eliminating the risk of shade variation between boxes on the finished surface.
- Keep Spare Tiles After Installation: Retain a minimum of 5–10% of the total order as spare tiles stored in their original packaging. Tile ranges are discontinued within 2–5 years on average in the UK, making batch-matched replacements unavailable without retained stock.
How Can Tile Mountain Help You Get Your Tile Order Exactly Right?
Tile Mountain provides a free online tile calculator, free tile samples, and direct access to a expert tiling team to ensure every tile order is accurate before purchase.
The 4 ways Tile Mountain helps you get your tile order right are given below:
- Free Online Tile Calculator: Our tile calculator gives an instant tile quantity by entering the room dimensions and tile size. The calculator applies the correct wastage allowance automatically, removing the risk of under-ordering or over-ordering tiles.
- Free Tile Samples: Order free tile samples before committing to a full tile quantity. Samples allow colour, texture, and finish to be checked against the actual room lighting and existing décor before placing a full order.
- Expert Tile Team: Our tiling experts are available by phone, live chat, and in-showroom consultation to review measurements, confirm tile quantities, and advise on laying patterns and wastage allowances for any room type or tile format.
- Thousands of Verified Customer Reviews: Tile Mountain is trusted by thousands of UK homeowners, with verified customer reviews confirming accurate order advice, correct tile quantities, and reliable delivery across the UK.
