Tile Waste Factor Calculator
Your project
Recommended waste factor
10%
- Pattern baseline
- 10%
- Room shape add-on
- +0%
- Experience add-on
- +0%
- Extra tile to buy
- 12 sq ft
- Total to order
- 132 sq ft
Round up to full boxes, then keep one unopened box for repairs.
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.
Tools the pros use for this job
Tile Nippers
Rescue awkward cuts around pipes instead of scrapping the tile.
Diamond Hole Saw Kit
6 Pcs Dry Diamond Drill Bit Set for Tile,Ceramic,Glass,1/4",5/16",3/8",1/2"
$14.99
Check price on AmazonClean holes for shower valves and toilet flanges, no cracked tile.
Tile Wet Saw
The single biggest reduction in breakage for a DIY job.
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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 cutter? See our tile saw 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
Start with a pattern baseline, then add for room complexity and inexperience. A 10% waste factor on a straight-laid 120 sq ft floor is 12 extra square feet — about one box.
- Straight/grid: 10%
- Offset/brick: 12%
- Diagonal 45°: 15%
- Herringbone: 20%
Large-format tile (24 in and up) breaks more in transit and handling, and mosaic sheets waste less because you can cut individual chips off a sheet.
Frequently asked questions
Is 10% waste enough for tile?
For a straight layout in a simple rectangular room, yes. Add 5% for a first-time installer and 5–10% more for diagonal or herringbone patterns.
Why do I need a spare box after the job?
Tile is made in dye lots. A replacement box bought a year later will usually be a slightly different shade, so a leftover box from your own lot is the only true match.
Can I return unopened tile boxes?
Most big-box stores accept unopened, uncut boxes within their return window — keep the receipt and the box labels intact. Special-order tile is often non-returnable.
Related calculators
- Tile Quantity CalculatorHow many tiles you need for any room, wall, or floor — with waste.
- Tile Area CalculatorSquare footage for multiple rooms and shapes, minus openings.
- Tile Layout & Pattern CalculatorCut sizes and row counts for grid, offset, diagonal, herringbone.
- Tile Cost EstimatorTotal project cost: tile, grout, mortar, trim, and labor.
Guides worth reading next
- How to Cut Tile: Snap Cutter, Wet Saw, Grinder and NippersMatch the cut to the tool: straight rips on a snap cutter, L-cuts and notches on a wet saw, curves with nippers, and when a $10 scoring wheel is all you need.
- 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.
- Choosing the Right Tile Size for Your RoomHow tile size changes a room: when 12×24 beats 4×4, why small rooms can take large tile, grout line math, and the flatness rule for big formats.