Tile Calculator
Your measurements
Changing the pattern sets a recommended waste factor.
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Tiles to buy
66 tiles
- Room area
- 120 sq ft
- Area including waste
- 132 sq ft
- One tile covers
- 2 sq ft
- Boxes needed
- 9 boxes
- Waste applied
- 10%
Round up to full boxes and keep one spare box from the same dye lot.
Save this calculation in the free app
Smart Tile Calculator keeps your tile jobs on your phone, offline. On iPhone? It's inside Roofing Calculator & Estimator.
Next step for this job
66 tiles covers 132 sq ft with waste. Before you order, pick the joint width and spacers for 12x24 tile in the tile spacer guide — it decides the grout you buy.
People also calculate
Tools the pros use for this job
Tile Spacers
DGSL Tile Leveling System with Plier, 300 Tile Spacers 1/8" and 100 Wedges
$25.99
Check price on AmazonConsistent joints are what make a tile floor read as straight.
Tile Wet Saw
Rent or buy — you'll cut 15–25% of the tiles in any room.
Notched Trowel
Match the notch to tile size for full mortar coverage.
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Prices as of Oct 10, 2026, 6:33 AM UTC. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Choosing a tile saw? See our tile saw buying guide.
Laying large tile? See our tile leveling system buying guide.
Do this math on the job site — in the free app
Smart Tile Calculator for Android: offline, in your pocket, free.
How this calculator works
The math is simple: room area ÷ area of one tile, then add waste. A 12" × 24" tile covers 2 sq ft, so a 120 sq ft floor needs 60 tiles before waste and 66 tiles at 10% waste.
- Straight/grid layouts: 10% waste.
- Diagonal: 15% — every perimeter tile becomes two triangles.
- Herringbone: 20% — the most cut-heavy common pattern.
Buy in full boxes. Keep one unopened box for future repairs; matching tile two years later is usually impossible.
Frequently asked questions
How many 12x24 tiles are in 100 square feet?
Each 12x24 tile covers 2 square feet, so 100 sq ft needs 50 tiles before waste — about 55 tiles with a 10% waste allowance for cuts.
How much extra tile should I buy?
Add 10% for a straight layout, 15% for diagonal, and 20% for herringbone or busy patterns. Add another 5% if the room has many jogs, closets, or curved cuts.
Should I calculate by tile count or square footage?
Buy by square footage in full boxes — that is how tile is sold. Use the tile count to sanity-check the store's box math.
Related calculators
- Tile Area CalculatorSquare footage for multiple rooms and shapes, minus openings.
- Waste Factor CalculatorHow much extra tile to buy for cuts, patterns, and breakage.
- Grout CalculatorPounds of grout by tile size, joint width, and thickness.
- Thinset & Mortar CalculatorBags of thinset by trowel notch size and coverage.
- Standard Tile Sizes ChartEvery standard floor, wall and subway size with sq ft per tile and tiles per 100 sq ft.
- Stair Tile CalculatorTiles for treads and risers counted step by step, nosing, and an IRC riser check.
Guides worth reading next
- How Many Tiles Do I Need? A Worked Example, Start to FinishA real 10×12 room taken from tape measure to order quantity: net area, waste factor, per-tile coverage, box math, and the attic stock rule.
- Tile Trends 2026: What's In, What's Out, What's TimelessWarm stone tones over cool gray, zellige texture, large-format slabs, and the patterns aging well — plus the 'timeless' picks if you tile once.
- How to Measure a Room for Tile (Step by Step)Measure any room for floor or wall tile: handle closets and alcoves, convert inches to decimals, subtract fixtures, and add the right waste percentage.