Tile Calculator
Estimate tiles, boxes, grout, adhesive, waste allowance, and total cost for floors, walls, bathrooms, showers, backsplashes, patios, stairs, mosaics, pools, and commercial tile projects.
Last Updated: May 17, 2026
Tile project inputs
Enter the surface size, tile size, waste allowance, box details, grout, adhesive, and cost assumptions. Use repeated sections for multiple rooms or walls.
Use this for repeated walls, rooms, stair treads, or identical sections.
Door, window, cabinet, niche, fireplace, or appliance area.
Tile size, pattern, and waste
Choose a common tile size or enter custom dimensions. Pattern changes automatically update the suggested waste allowance.
Best for simple rectangular rooms with fewer cuts.
Boxes, grout, adhesive, and cost
Tile can be sold per box, per piece, or per square foot. Box coverage mode is useful when the manufacturer prints coverage per carton.
Final tiles to buy
130
Boxes required
11
Net tile area
120 sq ft
Estimated total cost
$1,341
Live Tile Layout Sketch
The sketch reflects the selected surface shape, pattern, grout grid, and deduction area.
Shopping list
| Item | Estimate | Note |
|---|---|---|
| Net surface area | 120 sq ft | After deductions. |
| Area with waste | 132 sq ft | 10% allowance. |
| Tiles before waste | 118 | Rounded up to whole tiles. |
| Final tiles to buy | 130 | 12 waste tiles included. |
| Boxes required | 11 | 2 spare tiles after full boxes. |
| Grout estimate | 8.6 lb | 1 bag(s). |
| Adhesive / thinset | 2 bag(s) | 80 sq ft per bag. |
Cost breakdown
| Item | Cost | Basis |
|---|---|---|
| Tile | $495 | Based on boxes needed. |
| Grout | $22 | 1 bag(s). |
| Adhesive / thinset | $56 | 2 bag(s). |
| Labor | $720 | $6 per sq ft. |
| Extras | $48 | Spacers, trim, underlayment, waterproofing, and delivery. |
| Tax | $0 | 0% tax or VAT. |
| Total estimated cost | $1,341 | Planning estimate, not a contractor quote. |
Step-by-step solution
- Step 1: Gross area = 12 x 10 x 1 sections
- Step 2: Net area = 120 sq ft - 0 sq ft = 120 sq ft
- Step 3: Tile coverage = 1 ft x 1 ft, with grout joint considered where useful = 1.0209 sq ft per tile
- Step 4: Tiles before waste = ceil(120 / 1.0209) = 118
- Step 5: Final tiles = ceil(118 x (1 + 0.1)) = 130
- Step 6: Boxes needed = ceil(130 tiles / 12 tiles per box) = 11
- Step 7: Total cost = tile + grout + adhesive + labor + extras + tax = 1341
Tile Planning Notice
This calculator provides planning estimates only. Actual tile, grout, adhesive, waterproofing, trim, underlayment, and labor needs can change with substrate condition, tile calibration, layout direction, trowel size, waste, site cuts, waterproofing details, installer practice, and supplier packaging. Confirm final quantities with your installer, tile supplier, or project plans before ordering.
Checked by Jitendra Kumar
Tile Calculator is checked for formula labels, source links, and result limits.
Jitendra Kumar, Founder & Editorial Standards Lead. Updated May 17, 2026. Scope: measurement calculators.
How to Use the Tile Calculator
Choose a project type and surface shape, then enter the measured dimensions. For wall tile, enter width and height as the rectangular dimensions and use deductions for doors, windows, cabinets, mirrors, fixtures, or appliances.
Pick a tile size preset or enter a custom tile length and width. Then choose a layout pattern, waste allowance, box method, material prices, grout, adhesive, labor, and optional extras such as trim or waterproofing.
Step 1: Measure the tiled surface
Choose a shape and enter floor, wall, backsplash, shower, patio, stair, or custom-area dimensions.
Step 2: Subtract untiled areas
Use deductions for doors, windows, cabinets, mirrors, fireplaces, fixtures, niches, or appliances.
Step 3: Set tile size and layout
Use a preset or custom tile size, then choose straight, brick, diagonal, herringbone, chevron, mosaic, modular, or complex pattern waste.
Step 4: Plan boxes and materials
Enter tiles per box or coverage per box, then review tile boxes, grout bags, adhesive bags, cost, and the printable shopping list.
How This Tile Calculator Works
The calculator converts surface dimensions and tile dimensions into square feet. For rectangular projects, area starts with \(A=L\times W\). Wall and bathroom projects can subtract untiled openings with \(A_{\text{net}}=A_{\text{gross}}-A_{\text{deductions}}\).
It divides net area by tile coverage, rounds up to whole tiles, then applies waste with \(\text{Final tiles}=\left\lceil\text{Tiles}\times(1+r)\right\rceil\). The recommended waste changes by layout pattern because diagonal, herringbone, chevron, modular, and complex layouts usually create more cut pieces.
Box count is rounded up from either tiles per box or square-foot coverage per box. Grout uses joint width, tile dimensions, thickness, and area as a planning estimate. Adhesive uses entered coverage per bag. Cost combines tile, grout, adhesive, labor, extras, delivery, and tax.
Tile Formulas, Buying Guide, and Common Mistakes
Tile Calculator Formula
| Formula | Expression | Use |
|---|---|---|
| Rectangle area | \(A=L\times W\) | Use for floors, walls, backsplashes, patios, and many shower surfaces. |
| Tile area | \(A_{\text{tile}}=l\times w\) | Convert tile dimensions to the same unit before dividing. |
| Tiles before waste | \(\text{Tiles}=\left\lceil\frac{A}{A_{\text{tile}}}\right\rceil\) | Rounds up because partial tiles still require a full tile. |
| Waste allowance | \(\text{Final tiles}=\left\lceil\text{Tiles}\times(1+r)\right\rceil\) | Adds stock for cuts, breakage, patterns, and future repairs. |
| Boxes needed | \(\text{Boxes}=\left\lceil\frac{\text{Final tiles}}{\text{Tiles per box}}\right\rceil\) | Use this when tile is sold by carton. |
| Net wall area | \(A_{\text{net}}=A_{\text{gross}}-A_{\text{deductions}}\) | Subtract doors, windows, cabinets, mirrors, niches, and appliances. |
| Total project cost | \(\text{Total}=\text{Tile}+\text{Grout}+\text{Adhesive}+\text{Labor}+\text{Extras}+\text{Tax}\) | Combines material and optional project costs. |
Shape and Area Formulas
| Shape | Formula | Use case |
|---|---|---|
| Rectangle | \(A=L\times W\) | Most floors, walls, and backsplashes. |
| Square | \(A=s^2\) | Square rooms, shower floors, and feature panels. |
| Triangle | \(A=\frac{1}{2}bh\) | Triangular accents or angled room sections. |
| Circle | \(A=\pi r^2\) | Round patios, medallions, or circular inserts. |
| Trapezoid | \(A=\frac{a+b}{2}h\) | Sloped walls and angled spaces. |
| L-shape | Area 1 + Area 2 | L-shaped rooms split into two rectangles. |
| Known area | Entered area | Use when plans already show the square footage. |
Tile Size Guide
| Tile size | Common use |
|---|---|
| 4 x 4 in | Bathroom walls, decorative panels, small features |
| 6 x 6 in | Walls, traditional shower areas, small floors |
| 8 x 8 in | Traditional floors and patterned rooms |
| 12 x 12 in | Standard floor tile and simple layouts |
| 12 x 24 in | Modern bathrooms, floors, and shower walls |
| 18 x 18 in | Larger floor areas with fewer grout lines |
| 24 x 24 in | Large-format flooring and open spaces |
| 24 x 48 in | Premium large-format porcelain and slab-style layouts |
| 3 x 6 in | Subway tile for backsplashes and walls |
| 12 x 12 in mosaic sheet | Backsplashes, shower floors, accents, and curves |
Layout Pattern and Waste Guide
| Layout pattern | Typical extra waste | Why it matters |
|---|---|---|
| Straight lay | 5% to 10% | Simple layout with lower cut waste. |
| Running bond / brick | About 10% | Offset rows need more end cuts. |
| Diagonal | 10% to 15% | Angled perimeter cuts increase waste. |
| Herringbone | 15% to 20% | Frequent directional cuts and layout alignment. |
| Chevron | 15% to 20% | Angled pieces and pattern matching. |
| Mosaic | 10% to 15% | Sheet trimming around edges, drains, and outlets. |
| Modular / Versailles | 15% to 25% | Mixed-size modules need extra stock. |
| Complex custom pattern | 20% to 30% | Borders, many obstacles, niches, and specialty cuts. |
Grout Joint Guide
| Joint width | Typical note |
|---|---|
| 1/16 in | Tight joints for rectified tile where installation tolerances allow it. |
| 1/8 in | Common for many wall and floor projects. |
| 3/16 in | Useful when tile size variation or layout movement needs a wider joint. |
| 1/4 in | Common for rustic tile, stone, and wider visual grout lines. |
| 2 mm to 3 mm | Metric equivalent range for narrow modern joints. |
| 5 mm to 10 mm | Wider joints for texture, stone, exterior work, or design effect. |
Project Mode Guide
| Use case | Planning tip |
|---|---|
| Floor tile | Measure length x width, choose tile size, add waste for cuts and pattern. |
| Wall tile | Measure wall width x height, subtract doors, windows, cabinets, and mirrors. |
| Bathroom tile | Add floor, wall, shower, niche, curb, and backsplash sections separately. |
| Shower tile | Include waterproofing, drains, niches, curbs, and slip-resistant floors. |
| Kitchen backsplash | Measure counter-to-cabinet height, subtract windows and appliance openings. |
| Patio tile | Use outdoor-rated tile, suitable adhesive, slope, and weather exposure planning. |
| Stair tile | Count treads and risers as repeated rectangular sections. |
| Mosaic tile | Use sheet size and add waste for curves, drains, and many small cuts. |
Tile Buying Guide
Buy enough tile from the same batch or lot number because shade, texture, size calibration, and surface finish can vary later. For normal projects, spare tiles are useful for future repairs; for patterned or wet-area projects, ordering too little can delay the job and create batch mismatch risk.
Confirm whether the box label lists pieces per box or square-foot coverage per box. Coverage can differ slightly once grout gaps, actual tile dimensions, and trimmed pieces are considered. Use the box coverage mode when the manufacturer gives a reliable carton coverage value.
In showers, pool areas, bathrooms, patios, and exterior work, choose tile, adhesive, grout, waterproofing, and substrate prep that match wet exposure, movement, freeze-thaw risk, slip resistance, and manufacturer instructions.
Common Tile Calculation Mistakes
| Mistake | Why it matters |
|---|---|
| Forgetting waste allowance | A perfect area calculation can still underbuy tile because cuts and breakage happen. |
| Mixing units | Tile size in inches and room size in feet must be converted before division. |
| Ignoring grout joints | Grout gap affects visual layout and grout material use. |
| Not subtracting openings | Doors, windows, cabinets, mirrors, and appliances can materially reduce wall tile area. |
| Buying different lots later | Shade and caliber can vary, so keep spare tiles from the same batch. |
| Using wall tile on floors | Floor tile needs suitable durability and slip resistance. |
| Underestimating wet-area prep | Showers and wet rooms need waterproofing and compatible materials. |
| Skipping layout planning | Center lines, border cuts, and pattern direction affect both appearance and waste. |
For complex homes, calculate each room or wall first with the Square Footage Calculator, then use the known-area mode here for tile purchase planning.
For other material projects, compare this result with the Concrete Calculator, Gravel Calculator, and Roofing Calculator.
Keep the research moving with Square Footage Calculator, Room / Plot / Lot Area & Size Calculator, Area Converter, and Concrete Calculator.
Frequently Asked Questions
Related Calculators
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Use Concrete CalculatorSources & References
- 1.NIST Special Publication 811 - Guide for the Use of the International System of Units (SI)(Accessed March 2026)
- 2.BIPM - International System of Units (SI) resources(Accessed March 2026)
- 3.NIST Metric Program(Accessed March 2026)
- 4.UK National Physical Laboratory - Units and standards resources(Accessed March 2026)
- 5.International Bureau of Legal Metrology (OIML)(Accessed March 2026)