Floor Tile Calculator
Your floor
Cabinet footprints, hearths, vents you are tiling around.
From the box label. Set to 0 to skip box count.
Tiles to buy
66
- Net floor area
- 120 sq ft
- With waste
- 132 sq ft
- Tile face area
- 2 sq ft
- Boxes to buy
- 9
Round up to full boxes. Keep one unopened box as your dye-lot match 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 Wet Saw
Straight, chip-free cuts for floor tile all day long.
Leveling System
DGSL Tile Leveling System with Plier, 600 Tile Spacers 1/8" and 200 Wedges
$35.09
Check price on AmazonStops lippage on 12×24 and plank floors — the #1 DIY complaint.
Knee Pads
NoCry Clear Safety Glasses for Men and Women with Anti-Fog and Scratch Resistant Wrap Around Lenses, Adjustable Temples and Nose Pads — ANSI Z87 Certified Protective Eyewear with 100% UV Shielding
$13.99
Check price on AmazonYou will spend hours on your knees. Buy these first.
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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.
Choosing mortar? See our thinset 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
Floor area is length × width, minus untiled areas. We divide the adjusted area by the face area of one tile, then add your waste factor and round up to full tiles and full boxes.
Tiles per box varies by manufacturer — check the box label, which also states the square feet per box. If you know coverage per box instead of pieces per box, divide your total square footage (with waste) by that number.
Frequently asked questions
How much waste should I add for floor tile?
10% for a straight layout in a rectangular room, 12–15% for offset or diagonal patterns, and up to 20% for herringbone. Keep one unopened box for future repairs.
Do I tile under kitchen cabinets or a vanity?
Most installers tile under appliances but not under fixed cabinets. Subtract the cabinet footprint, but tile under the dishwasher and fridge so the floor height stays even.
What size tile is best for a small floor?
12×24 and 12×12 are forgiving in small rooms. Very large tile (24×48) can make a small room choppy and needs a very flat floor; mosaic works anywhere but means more grout.
Related calculators
- Tile Quantity CalculatorHow many tiles you need for any room, wall, or floor — with waste.
- Waste Factor CalculatorHow much extra tile to buy for cuts, patterns, and breakage.
- Tile Layout & Pattern CalculatorCut sizes and row counts for grid, offset, diagonal, herringbone.
- Tile Cost EstimatorTotal project cost: tile, grout, mortar, trim, and labor.
- Carpet CalculatorSquare yards of 12 ft roll carpet, seams, waste, pad and tack strip.
- 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.
- Tile Baseboard CalculatorLinear feet of tile base, pieces to buy, or floor tiles to cut into strips.
Guides worth reading next
- 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.
- Sanded vs Unsanded vs Epoxy Grout: Which One Do You Need?Grout types explained by joint width and location: when sand scratches tile, why epoxy wins in showers, and how much of each type a bag actually covers.