The Tile Quantity Calculator estimates the approximate number of tiles required for a rectangular floor, wall or other surface. It accepts surface dimensions in feet or metres and tile dimensions in millimetres, centimetres or inches, so users can work with the units normally shown on room drawings and tile packaging.
The calculator deducts a user-entered untiled or opening area, applies a selected wastage or spare allowance, rounds the result up to complete tiles and, when packaging information is entered, calculates full boxes, supplied tiles and surplus tiles. It can also estimate tile-material cost from a price per tile or price per box.
Important: This is an area-based preliminary quantity estimator, not a tile-setting layout or supplier quotation. Measure from the latest project information, enter the actual tile and box details, and verify the final order with the tile manufacturer, supplier and installer.
Page Contents
Use the Tile Quantity Calculator
Enter the floor length and width, or the combined wall length and tiling height. Select the correct units separately for the surface and the tile, add only the untiled or opening area that should genuinely be deducted, and use a project-specific wastage allowance.
Tile Quantity Calculator
Box and price fields are optional. Enter the exact packaging and price information supplied for the selected tile.
View Calculation Details & Formula
Round the result up to the next whole tile.
Round the result up to the next full box.
What Is a Tile Quantity Calculator?
A tile quantity calculator is a planning tool that divides the net area to be tiled by the face area of one tile. It then applies the selected allowance for cutting, breakage, pattern requirements and spare tiles before rounding upward to a purchasable whole quantity.
When tiles are supplied only in complete boxes, the required tile quantity must be converted into full boxes. This may provide more tiles than the calculated requirement, and the difference is shown as surplus tiles. That surplus can be retained for replacement work, provided it is stored safely and remains suitable for future use.
What This Calculator Estimates
- Gross rectangular surface area
- Deducted untiled or opening area
- Net tiled area
- Area of one tile after unit conversion
- Calculated tiles before whole-number rounding
- Whole tiles before the wastage allowance
- Additional whole tiles created by the selected allowance
- Final tiles required including wastage
- Full boxes required when tiles per box are entered
- Tiles supplied and surplus after full-box ordering
- Estimated tile-material cost when a valid price basis is selected
Information Required for the Estimate
1. Surface Type
Select Floor, Wall or Other rectangular surface. The selection changes the input labels but does not change the mathematical area method.
2. Surface Dimensions and Unit
For a floor, enter its length and width. For a wall, enter the wall length and the height up to which tiles will be installed. Surface dimensions can be entered in feet or metres.
3. Untiled or Opening Area
Enter the combined area of doors, windows, cabinets or other portions that will not receive tiles. The deduction must use the square unit corresponding to the selected surface unit: square feet when feet are selected or square metres when metres are selected.
4. Tile Dimensions and Unit
Enter the tile length and width using the dimensions stated by the manufacturer or supplier. Tile dimensions can be entered independently in millimetres, centimetres or inches.
5. Wastage or Spare Allowance
The percentage entered by the user increases the theoretical tile quantity to provide for cuts, breakage, pattern requirements and retained spare tiles. It should reflect the actual layout and project conditions rather than a universal percentage.
6. Tiles per Box
Enter the number printed on the selected product packaging. When this field is completed, the calculator rounds the final tile quantity up to full boxes and shows the actual number of tiles supplied.
7. Price Basis, Price and Currency
Cost calculation is optional. Select price per tile or price per box, enter the corresponding price and select a currency symbol. The calculator does not perform currency conversion.
Tile Quantity Calculation Formulas
Step 1: Convert the Dimensions to a Common Unit
Feet to metres: Length in metres = Length in feet × 0.3048
Square feet to square metres: Area in m² = Area in sq ft × 0.09290304
Millimetres to metres: Length in metres = Length in mm ÷ 1,000
Centimetres to metres: Length in metres = Length in cm ÷ 100
Inches to metres: Length in metres = Length in inches × 0.0254
The calculator performs its internal area calculations in square metres and also displays the resulting areas in square feet.
Step 2: Calculate Gross Surface Area
Gross Surface Area = Surface Length × Surface Width or Tiling Height
Step 3: Deduct Untiled or Opening Areas
Net Tiled Area = Gross Surface Area − Total Untiled or Opening Area
The deduction must be smaller than the gross area. Do not deduct a small penetration automatically when the surrounding cuts will still consume approximately the same tiles.
Step 4: Calculate the Area of One Tile
Area of One Tile = Tile Length × Tile Width
Step 5: Calculate Tiles Before Wastage
Calculated Tiles = Net Tiled Area ÷ Area of One Tile
This theoretical result may contain a decimal. The calculator separately displays the next whole-tile quantity before applying the selected wastage allowance.
Step 6: Apply Wastage and Round Upward
Final Tiles = Calculated Tiles × (1 + Wastage Percentage ÷ 100)
The calculator applies the percentage to the unrounded theoretical quantity and then rounds the result up to the next whole tile. Rounding upward prevents a fractional tile from being treated as a purchasable complete unit.
Step 7: Calculate Full Boxes
Boxes Required = Final Tiles ÷ Tiles per Box
Tiles Supplied = Full Boxes Required × Tiles per Box
Surplus Tiles = Tiles Supplied − Final Tiles Required
Boxes are always rounded up to the next complete box because partial boxes may not be available for purchase.
Step 8: Estimate Tile-Material Cost
When priced per box: Estimated Cost = Full Boxes Required × Price per Box
When priced per tile: Estimated Cost = Payable Tile Quantity × Price per Tile
If tiles per box are entered, the per-tile cost is applied to all tiles supplied in the calculated full boxes. If packaging is not entered, it is applied to the final required tile quantity.
How to Use the Tile Quantity Calculator
- Select whether the surface is a floor, wall or another rectangular area.
- Select feet or metres for the surface dimensions.
- Enter the floor length and width, or the wall length and tiling height.
- Enter the combined untiled or opening area, or leave the default value at zero when no deduction is required.
- Enter the tile length and width shown for the selected product.
- Select millimetres, centimetres or inches for the tile dimensions.
- Enter a project-specific wastage or spare allowance.
- Enter tiles per box when full-box ordering is required.
- Choose a price basis and currency only when material-cost estimation is needed.
- Click Calculate Tile Quantity and review the net area, tile quantity, full boxes, surplus and cost before purchasing.
How to Measure Floor Tile Area
Rectangular Floor
Floor Area = Floor Length × Floor Width
Measure between the finished boundaries of the area that will receive tiles. Use the same length unit for both dimensions.
L-Shaped or Irregular Floor
Divide the floor into non-overlapping rectangles, calculate each area separately and add the results. Run the calculator for each tile type or layout zone when different products are used. Avoid counting an overlapping rectangle twice.
Total Floor Area = Area of Section 1 + Area of Section 2 + …
How to Measure Wall Tile Area
For one wall, multiply the wall length by the intended tiling height and deduct any clearly untiled openings. For several walls of the same height, add their lengths first and use the combined length in the calculator.
Gross Wall Tiling Area = Combined Wall Length × Tiling Height
Net Wall Tiling Area = Gross Wall Tiling Area − Doors, Windows and Other Untiled Areas
Practical measurement note: If only part of a wall receives tiles, use the actual tiling height rather than the full floor-to-ceiling height. Measure each wall separately when tiling heights differ.
Selecting a Wastage Allowance
The allowance should be selected after considering tile layout, room geometry, tile size, cutting, breakage risk, workmanship, batch availability and whether spare tiles will be retained. The following ranges are planning guidance only; they are not universal standards.
| Installation condition | Planning allowance | Why it may be needed |
|---|---|---|
| Straight layout in a simple rectangular area | 5–10% | Limited cuts and straightforward setting-out |
| Ordinary installation with several cuts | About 10% | Typical edges, corners and normal handling loss |
| Diagonal layout or irregular geometry | 10–15% | More triangular cuts and reduced offcut reuse |
| Complex pattern, borders or fragile material | 15–20% or project-specific | Pattern matching, breakage or specialist cutting |
| Wall tiling with several fixtures or openings | Project-specific; often 10–15% | Multiple penetrations, corners and small cut pieces |
Do not treat these percentages as fixed: Confirm the allowance with the installer and supplier, particularly for natural stone, large-format tiles, directional patterns, discontinued products or areas with many small cuts.
Common Tile Sizes and Typical Uses
Tile sizes vary by material, manufacturer, market and product series. The dimensions below are examples for planning and should not replace the selected product data.
| Example tile size | Illustrative application |
|---|---|
| 300 × 300 mm | Small floors, utility areas and some bathroom applications |
| 300 × 600 mm | Bathroom walls, kitchen walls and rectangular floor layouts |
| 600 × 600 mm | Residential and light-commercial flooring |
| 600 × 1,200 mm | Large-format floors and walls |
| 800 × 800 mm | Large interior floor areas |
| 1,200 × 1,200 mm | Large-format premium spaces where handling and substrate tolerances permit |
| 75 × 150 mm or 100 × 200 mm | Subway-style kitchen and bathroom wall applications |
Floor Tile Calculator
Use the calculator to estimate tiles for bedrooms, living rooms, halls, offices, terraces, balconies and other residential or commercial flooring areas.
Enter the finished floor length and width, deduct any area that will remain untiled and then enter the dimensions of the selected tile. Different rooms, tile sizes or layout zones should be calculated separately.
Example: Floor Tile Calculation
Assume the following inputs:
- Room length = 12 ft
- Room width = 10 ft
- Untiled area = 0 sq ft
- Tile size = 2 ft × 2 ft
- Wastage allowance = 10%
Floor area = 12 × 10 = 120 sq ft
Area of one tile = 2 × 2 = 4 sq ft
Calculated tiles = 120 ÷ 4 = 30 tiles
Tiles including allowance = 30 × 1.10 = 33 tiles
Therefore, the preliminary floor tile requirement is 33 tiles.
If the product is sold only in complete boxes, enter the actual tiles per box so the calculator can determine the number of boxes to purchase.
Wall Tile Calculator
The calculator can estimate tiles for bathroom walls, kitchen walls, utility areas, feature walls and other wall-cladding applications.
For one wall, enter its length and intended tiling height. For several walls with the same tiling height, add their lengths and enter the combined length. Deduct doors, windows and other areas that will clearly remain untiled.
Example: Wall Tile Calculation
Assume the following inputs:
- Wall length = 15 ft
- Tiling height = 10 ft
- Untiled area = 0 sq ft
- Tile size = 1 ft × 2 ft
- Wastage allowance = 10%
Gross wall area = 15 × 10 = 150 sq ft
Area of one tile = 1 × 2 = 2 sq ft
Calculated tiles = 150 ÷ 2 = 75 tiles
Tiles including allowance = 75 × 1.10 = 82.5 tiles
Round upward to the next whole tile = 83 tiles
Therefore, the preliminary wall tile requirement is 83 tiles.
Where doors, windows or other untiled portions are present, calculate and deduct their combined area before determining the tile quantity.
Bathroom Tile Calculator
The calculator can be used separately for:
- Bathroom floor tiles
- Bathroom wall tiles
- Shower-area tiles
- Vanity-wall tiles
- Niches and other tiled zones
Calculate the floor and walls separately when they use different tile sizes, patterns or wastage allowances.
Bathroom layouts may require additional tiles because of cuts around drains, fixtures, corners, pipes, niches and sanitary fittings. A planning allowance of approximately 10–15% is sometimes considered for layouts involving numerous cuts, but this is not a fixed requirement. Select the percentage according to the actual layout, tile size, workmanship and installer’s advice.
Example: Bathroom Floor Tile Calculation
Assume the following inputs:
- Bathroom floor = 8 ft × 6 ft
- Floor area = 48 sq ft
- Tile size = 2 ft × 2 ft
- Tile area = 4 sq ft
- Wastage allowance = 10%
Calculated tiles = 48 ÷ 4 = 12 tiles
Tiles including allowance = 12 × 1.10 = 13.2 tiles
Round upward to the next whole tile = 14 tiles
Therefore, the preliminary bathroom floor requirement is 14 tiles.
This example does not account for a shower recess, raised platform or another separately tiled zone. Calculate such areas independently when necessary.
Kitchen Tile Calculator
Use the calculator for kitchen floors, backsplashes, dado tiles, utility walls and other tiled kitchen surfaces.
For a backsplash, measure only the actual length and height that will receive tiles. Deduct large untiled areas, but consider whether small electrical outlets will simply create cuts rather than save a complete tile.
Example: Kitchen Backsplash Calculation
Assume the following inputs:
- Backsplash length = 10 ft
- Backsplash height = 2 ft
- Backsplash area = 20 sq ft
- Tile size = 0.5 ft × 1 ft
- Tile area = 0.5 sq ft
- Wastage allowance = 10%
Calculated tiles = 20 ÷ 0.5 = 40 tiles
Tiles including allowance = 40 × 1.10 = 44 tiles
Therefore, the preliminary kitchen backsplash requirement is 44 tiles.
Where several wall sections are separated by windows, tall cabinets or appliances, measure each tiled section carefully and add the applicable areas.
Tile Box Calculator and Full-Box Ordering
Tiles are commonly supplied in complete boxes. Enter the actual number of tiles per box printed on the selected product packaging.
Boxes Required = Final Tile Quantity ÷ Tiles per Box
Always round the result up to the next complete box when partial boxes are unavailable.
Example: Tile Box Calculation
Assume:
- Final tiles required = 83
- Tiles per box = 8
Boxes required = 83 ÷ 8 = 10.375 boxes
Round upward = 11 boxes
Tiles supplied = 11 × 8 = 88 tiles
Surplus after full-box purchase = 88 − 83 = 5 tiles
Therefore, the preliminary order is 11 boxes containing 88 tiles. The five surplus tiles can be retained for possible replacements, subject to suitable storage.
The number of tiles and stated coverage per box vary by product, manufacturer, tile thickness and packaging. Do not assume a standard quantity. Verify the selected product’s packaging before ordering.
Batch-control note: Where shade, colour, texture or calibre may vary, obtain sufficient tiles from the same production batch. Tiles purchased later may not match the original installation.
Tile Cost Calculator and Cost Exclusions
The calculator can estimate tile-material cost using either a price per tile or a price per box.
Cost per Tile Formula
Estimated Tile Cost = Payable Tile Quantity × Price per Tile
When tiles-per-box information is entered, the payable quantity includes all tiles supplied in the calculated full boxes. Without box information, the price is applied to the final required tile quantity.
Example: Cost per Tile
Assume:
- Payable tile quantity = 60 tiles
- Price per tile = $3
Estimated tile-material cost = 60 × $3 = $180
Therefore, the estimated tile-material cost is $180.
Cost per Box Formula
Estimated Tile Cost = Full Boxes Required × Price per Box
For example, if nine boxes are required and each box costs ₹850:
Estimated tile-material cost = 9 × ₹850 = ₹7,650
The currency symbol selected by the user is applied to the entered price. The calculator does not convert one currency into another.
Costs Not Automatically Included
The result estimates only the tile-material amount represented by the entered price. It does not automatically include:
- Tile adhesive or mortar-bed materials
- Grout, sealant and movement-joint materials
- Waterproofing, screed or levelling compounds
- Skirting, trims, profiles, spacers and accessories
- Surface preparation, repairs or substrate strengthening
- Labour, cutting, laying, polishing or specialist equipment
- Transport, unloading, handling and storage
- Taxes, supplier charges or price escalation
These items should be estimated separately when preparing the complete tiling budget.
Additional Tile Quantity Calculation Examples
The following examples use a 10% allowance only to demonstrate the calculation method. The appropriate project allowance must be selected according to the actual layout, cutting requirements, tile characteristics and site conditions.
| Application | Surface dimensions | Tile size | Tiles before allowance | Final quantity with 10% allowance |
|---|---|---|---|---|
| Bedroom floor | 10 ft × 10 ft | 2 ft × 2 ft | 25 | 28 tiles |
| Living-room floor | 16 ft × 14 ft | 2 ft × 2 ft | 56 | 62 tiles |
| Bathroom wall | 12 ft × 8 ft | 1 ft × 1.5 ft | 64 | 71 tiles |
| Balcony floor | 8 ft × 6 ft | 2 ft × 2 ft | 12 | 14 tiles |
| Metric room example | 5 m × 4 m | 0.6 m × 0.6 m | 55.556 | 62 tiles |
All fractional final quantities are rounded upward because a fraction of a physical tile cannot be ordered as a complete unit. Full-box ordering may increase the supplied quantity further.
Special Measurement Situations
Stairs, Skirting and Narrow Bands
Measure treads, risers, landings and skirting strips separately. An area-only result may underestimate cutting loss where narrow strips are produced from larger tiles, so confirm the cutting schedule with the installer.
Mosaics and Sheet-Mounted Products
Treat the complete sheet as the tile unit and enter the sheet length and width. Do not enter the dimensions of an individual mosaic piece unless pieces are purchased individually.
Large-Format or Patterned Tiles
Large-format tiles, book-matched patterns, directional graphics and borders can require a layout-specific allowance. Review setting-out, joint alignment, pattern continuity and handling risk before ordering.
Grout Joints and Manufacturer Coverage
The calculator uses the entered tile face dimensions and does not add grout-joint width to the tile module. For a preliminary purchase estimate, use the product dimensions and verify the result against the coverage printed on the tile box or supplied by the manufacturer.
Grout joints, tile tolerances and setting-out can slightly change theoretical coverage. Manufacturer packaging, an approved tile layout and installer verification should take precedence when finalising the order.
Practical Tips for Accurate Tile Estimation
- Measure each surface from current drawings or verified site dimensions.
- Keep the surface and tile unit selections consistent with the numbers entered.
- Calculate different tile products and pattern zones separately.
- Deduct only areas that will genuinely remain untiled.
- Confirm the tile size, tiles per box and box coverage on the selected packaging.
- Select wastage according to layout, cuts, breakage risk and retained spares.
- Round tiles and boxes upward; do not order a fractional physical unit.
- Check the production batch, shade and calibre before placing the final order.
- Store suitable surplus tiles safely for possible future repairs.
- Obtain installer and supplier confirmation before purchasing large quantities.
Limitations of the Calculator
- It calculates area, not the position of each tile in a setting-out drawing.
- It cannot determine whether every offcut can be reused.
- It does not optimise borders, diagonal patterns or book-matched layouts.
- It does not check substrate condition, flatness, waterproofing or structural suitability.
- It relies entirely on the dimensions, deductions, packaging and prices entered by the user.
- It does not include installation materials, labour or project-specific commercial charges unless calculated separately.
- It cannot guarantee that a later batch will match the tiles originally purchased.
Frequently Asked Questions
How Accurate Is the Tile Quantity Calculator?
It provides an area-based preliminary estimate. Its usefulness depends on correct surface measurements, tile dimensions, deductions, wastage and box information. A final order should be checked against the approved layout, manufacturer coverage and supplier packaging.
Can I Use the Calculator for Both Floors and Walls?
Yes. For a floor, enter length and width. For a wall, enter wall length and tiling height. For several walls of equal height, their lengths may be combined before deducting doors, windows and other untiled areas.
Can the Room and Tile Use Different Units?
Yes. Surface dimensions can be entered in feet or metres, while tile dimensions can independently be entered in millimetres, centimetres or inches. The calculator converts the inputs internally before comparing their areas.
How Are Tile Boxes Calculated?
The final tile quantity is divided by the entered tiles per box, and the result is rounded up to the next complete box. The calculator also shows the tiles supplied and any surplus created by full-box ordering.
How Does the Tile Cost Calculation Work?
For price per box, the calculated full boxes are multiplied by the entered box price. For price per tile, the price is applied to the payable tile quantity. When box information is entered, this means all tiles supplied in the full boxes.
How Much Wastage Should I Add?
There is no universal percentage. A simple straight layout may need a lower allowance than a diagonal, patterned or irregular layout. Consider cuts, breakage, workmanship, tile fragility, batch availability and retained spares, then confirm the allowance with the installer and supplier.
Should Doors and Windows Be Deducted from Wall Tile Area?
Deduct areas that will clearly remain untiled. For very small penetrations, consider whether surrounding cuts will still consume approximately the same number of tiles before making a deduction.
How Do I Calculate Tiles for an Irregular Room?
Divide the room into non-overlapping rectangles, calculate each section and add the results. Calculate separate zones independently when they use different tile sizes, patterns or allowances.
Does the Calculator Include Grout Joints?
No. It uses the entered tile face dimensions. Verify the final result against the manufacturer’s declared box coverage and the approved tile layout, particularly where joint width or modular dimensions materially affect setting-out.
Can I Use the Calculator for Mosaic Tiles?
Yes, but use the dimensions of one complete mosaic sheet when the product is supplied as sheets. Entering the dimensions of each small piece would incorrectly treat those pieces as separately purchased tiles.
Should I Retain Spare Tiles After Installation?
Retaining suitable spare tiles can help with future repairs, especially when colour, texture, shade or calibre may be difficult to match later. The required spare quantity is project-specific.
Does the Estimated Cost Include Adhesive, Grout and Labour?
No. The cost output represents tile material based on the entered price. Adhesive, grout, waterproofing, preparation, trims, labour, transport, taxes and other charges must be estimated separately unless deliberately included in another project budget.
Related Construction Quantity Calculators
- House Construction Cost Calculator — Estimate a preliminary building budget from built-up area, construction rate and selected allowances.
- Brick Quantity Calculator — Estimate bricks for masonry after deducting openings and applying a user-entered wastage allowance.
- Plaster Quantity Calculator — Estimate plaster materials using area, thickness and selected mortar proportions.
- Paint Quantity Calculator — Estimate paint requirements from surface area, coats, coverage and deductions.
- Concrete Volume Calculator — Calculate concrete volume for common structural elements.
- Cement, Sand & Aggregate Calculator — Estimate material quantities for selected nominal concrete mixes.
- Steel Bar Weight Calculator — Calculate reinforcement bar weight from diameter and length.
- Bar Bending Schedule Calculator — Calculate reinforcement quantities using entered bar details.
Summary
The Tile Quantity Calculator provides a transparent preliminary estimate for floor and wall tiling. It converts surface and tile dimensions entered in different units, deducts untiled areas, applies a user-selected allowance, rounds upward to whole tiles and boxes, and can estimate tile-material cost from project-specific packaging and prices.
For the most reliable result, measure every surface carefully, use the selected product dimensions and box details, choose an allowance that reflects the actual tile layout, and verify the final order against manufacturer coverage, supplier information and installer setting-out.
About T Square Civil Engineering
T Square Civil Engineering is a civil engineering learning platform dedicated to connecting theory with construction practice. Our mission is to help students, site engineers, contractors and construction professionals improve their knowledge through technically reviewed guides, practical examples, calculators and construction-focused learning resources.
Disclaimer
This calculator and article are provided for educational, general-reference and preliminary material-planning purposes only. The results are approximate and do not constitute a supplier quotation, purchase order, bill of quantities, installation layout, specification, design or professional cost certification. Actual tile requirements depend on verified dimensions, approved layouts, tile size and tolerances, grout joints, pattern, cutting, breakage, workmanship, manufacturer packaging, batch availability and site conditions. Prices, currencies and allowances are entered by the user and are not verified by T Square Civil Engineering. Confirm the final quantity, box coverage, batch, shade, calibre, accessories and installation requirements with appropriately qualified professionals, the manufacturer, supplier and installer before purchasing or commencing work. T Square Civil Engineering is not responsible for loss or damage arising from reliance on or use of this information.