Tile Calculation Guides
Practical guides on measuring, estimating, and calculating tiles for every room and layout.
These guides are the companion to our tile calculator. Each one walks through a real project — measuring the space, choosing a tile size, deciding on a layout, and adding the right waste allowance — so the number the calculator gives you actually matches what you carry out of the store. Every example is worked by hand and checked against the same formulas the calculator uses.
Not sure where to start? If you just want the method, read how many tiles do I need. If you’re tiling a specific surface, jump to the floor, shower, or backsplash guide. And before you order, check how much extra tile to buy so you don’t run short mid-installation.
Tile Calculation
How Many Tiles Do I Need?
The complete method for calculating tile quantity for any room, with worked examples for floors, walls, and bathrooms.
Floor Tiles
How to Calculate Tiles for a Floor
How to measure a floor, handle L-shaped rooms, account for waste, and work out exactly how many floor tiles and boxes you need.
Bathroom Tiles
How to Calculate Shower Tile
Measure a shower wall by wall and estimate tile for walls, floor, and niche — with a complete walk-in shower example.
Backsplash
How to Calculate Backsplash Tile
Measure a kitchen or bathroom backsplash and get an accurate tile count, including sheet-mounted mosaics and subway tile.
Tile Waste
How Much Extra Tile Should You Buy?
Why you need extra tile and the right waste percentage for every layout — straight, diagonal, herringbone, and chevron — with worked examples.
Wall Tiles
How to Calculate Wall Tile
Measure walls the right way and work out exactly how much wall tile you need — subtracting doors and windows, choosing a tile size, and adding waste.
Tile Calculation
How Many Tiles Are in a Square Foot?
A quick-reference chart of how many tiles fit in a square foot for every common size — 12x12, 12x24, 6x6, 4x4, 3x6 subway and more — plus the formula and worked examples.
Tile Calculation
How to Calculate Square Footage for Tile
Measure any room or wall and calculate the exact square footage for tile — including L-shaped rooms, backsplashes, unit conversion, and turning square feet into a tile count.
Tile Cost
How Much Does Tile Installation Cost? (2026 US Guide)
2026 US tile installation costs: labor per square foot, price by material and room, demolition and prep costs, DIY vs. pro, and how to estimate your own project.
Tile Calculation
How to Measure a Room for Tile (Step by Step)
A simple, US-friendly guide to measuring any room for tile: tools, the length × width method, L-shaped rooms, walls and openings, and a worked example.
Tile Calculation
How Many Boxes of Tile Do I Need?
Turn your square footage into an exact box count — how much a box of tile covers, the formula, a worked example, and why dye lot matters.
Materials
How Much Grout Do I Need? (Coverage Chart + Formula)
Work out how much grout to buy for any tile job — what drives grout usage, a coverage chart by tile size and joint width, a worked example, and sanded vs. unsanded.
Materials
How Much Thinset Do I Need? (Bag Coverage by Trowel Size)
Estimate how many bags of thinset mortar your tile job needs — coverage by trowel notch, a coverage chart, a worked example, and the extras that use more.
Stairs
How to Calculate Tile for Stairs (Treads, Risers & Nosing)
Measure and estimate tile for a staircase the right way — treads, risers, edge nosing, and waste — with a full worked example for US projects.
Materials
How Much Backer Board Do I Need? (Sheets, Sizes & Screws)
Work out how many sheets of cement backer board your tile job needs — sheet sizes and coverage, a worked example, screws and thinset, and where backer board is required.
Buying Guide
Porcelain vs. Ceramic Tile: Which Should You Choose?
The real differences between porcelain and ceramic tile — water absorption, durability (PEI), cost, and DIY-friendliness — plus which to use in every room.
Installation
Can You Tile Over Tile? When It Works and When to Avoid It
Can you tile over existing tile? Yes — if the old tile is flat, solid, and well-bonded. The rules, prep steps, height and weight limits, and when to remove instead.
Tile Layout
Tile Layout Patterns: 8 Popular Ways to Lay Tile (With Waste)
A visual guide to the 8 most popular tile layout patterns — straight, running bond, diagonal, herringbone, chevron, basketweave, pinwheel, and stacked — and the waste each one needs.
Materials
What Size Trowel Do I Need for Tile? (Notch Size Chart)
Match the trowel notch to your tile size — from mosaics and subway to 12x12, 12x24, and large-format — plus how notch size affects thinset coverage, coverage rules, and back-buttering.
Bathroom Tiles
What Size Tile Is Best for a Small Bathroom?
The best tile sizes for a small bathroom floor, walls, and shower — why large-format tile makes small rooms feel bigger, where small mosaics still win, and how to estimate how much you need.
Tile Cost
How Much Does It Cost to Tile a Bathroom? (2026 US Guide)
2026 US costs to tile a bathroom — floor only vs. full shower, labor per square foot, material prices, demolition and prep, DIY vs. pro, and how to estimate your own project.
Materials
How Big Should Grout Lines Be? (Tile Spacing Guide)
How wide should grout lines be? Choose the right tile spacing by tile type — from 1/16 inch for rectified large-format to 1/4 inch for stone — and why you should never tile with no grout line.
Backsplash
How Much Subway Tile Do I Need? (Count + Waste by Size)
Work out exactly how much subway tile to buy — how many 3x6 tiles are in a square foot, a count chart for every subway size, waste by layout, and a full worked example.
Tile Calculation
How to Calculate Tile for a Countertop (Counter, Edge & Backsplash)
Measure and estimate tile for a kitchen or bathroom countertop — the counter surface, front edge, and backsplash — with waste and a full worked example.
Installation
What Can You Tile Over? Surfaces & Substrates That Work
A clear guide to what you can and can't tile over — concrete, plywood, drywall, backer board, and existing tile — with the rules for dry vs. wet areas and how to prep each surface.
Tile Cost
How Much Does It Cost to Tile a Shower? (2026 US Guide)
2026 US costs to tile a shower — labor per square foot, tile and material prices, small vs. large walk-in, waterproofing, DIY vs. pro, and how to estimate your own project.
Buying Guide
Natural Stone vs. Porcelain Tile: Which Should You Choose?
Natural stone vs. porcelain tile compared — durability, water absorption, sealing and maintenance, cost, and looks — plus which to choose for floors, showers, and outdoor spaces.
Outdoor
How to Calculate Tile for a Patio or Outdoor Floor
Measure and estimate tile for an outdoor patio the right way — square footage, L-shapes, frost-resistant porcelain, waste, and a full worked example for US outdoor projects.
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