Carpet Tile Calculator
Your room and carpet square size
Every common tile size, from 2x2 mosaic to 24x48 large format.
Check the box label — it varies by brand.
Tiles to buy
49 tiles
- Area to cover
- 180 sq ft
- Area including waste
- 192.6 sq ft
- Tile size
- 24 x 24 in
- One tile covers
- 4 sq ft
- Boxes needed
- 7 boxes
- Waste applied
- 7%
Tile is sold by the box — round up 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.
Carpet tile coverage
| Square size | Coverage | Tiles per 100 sq ft | Typical box |
|---|---|---|---|
| 18 x 18 in | 2.25 sq ft | 45 | 16 tiles / 36 sq ft |
| 19.7 x 19.7 in (50 cm) | 2.69 sq ft | 38 | 20 tiles / 54 sq ft |
| 24 x 24 in | 4.00 sq ft | 25 | 12–20 tiles / 48–80 sq ft |
| 39 x 39 in (1 m) | 10.6 sq ft | 10 | 4 tiles / 42 sq ft |
Add 5% waste in a plain rectangular room, 10% with doorways or a quarter-turn layout.
Install gear for carpet squares
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 Amazon
REXBETI Knee Pads for Men, Anti-slip Construction Gel Knee Pads for Work | Heavy Duty Cap, Comfort Thick Gel Foam Pad, Stay Put Strong Stretchable Straps, For Construction Gardening Flooring Cleaning
$22.49
Check price on Amazon
NoCry Professional Construction Knee Pads for Men — Thigh Strap, Gel & Foam | Ankle Support, Heavy Duty Hard Cap, Foam & Extra Thick Gel, Reinforced Thigh & Shin Straps, Work Knee Pads For Construction
$34.17
Check price on Amazon
AirGearPro G-500 Reusable Respirator Mask with A1P2 Vapor & Dust Filters | respirator for Painting, Sanding, Spraying, Chemicals, Woodworking, DIY | Organic Vapor & Dust, Reusable
$39.99
Check price on Amazon
3M 8511 N95 Cool Flow Valved Respirator, 10-Pack | NIOSH-Approved, Relief From Dusts And Certain Particles During Sanding, Pollen, Mold Spores, Dust Particles
$24.99
Check price on Amazon
3M OV/P100 Odor/Particulate Multipurpose Respirator 65021, Medium | Reusable Respirator, 1-Facepiece and 1-pair of Replaceable NIOSH-Approved 60921 Combination Cartridge/Filters
$33.08
Check price on Amazon
As an Amazon Associate I earn from qualifying purchases.
Prices as of Oct 17, 2026, 4:39 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.
Tools the pros use for this job
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 AmazonCarpet tile is a whole day on your knees, every square.
Chalk Line
NAACOO Laminate Flooring Tools, Universal 4 in 1 Floor Installation Kit | Tapping Block-Double Sided with Notches, Pull Bar, 40Pcs Floor Spacers, Rubber Mallet
$19.99
Check price on AmazonSnap centre lines first — carpet tile drift is impossible to hide.
Transition Strip
Maxiroc Floor Transition Strip Self Adhesive Carpet Wood Tile Vinyl Flooring Laminate Transition Cover Edge Trim Gap Doorway Threshold for Uneven Floors Heights Within 5 mm (40 inches, Gray Forest)
$12.99
Check price on AmazonFinishes the doorway edge between carpet tile and hard floor.
As an Amazon Associate I earn from qualifying purchases.
Prices as of Oct 17, 2026, 4:39 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.
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
A 24x24 carpet tile covers 4 sq ft; 18x18 covers 2.25 sq ft; a 39x39 (1 metre) tile covers about 10.6 sq ft. Divide your room area by the coverage and add 5% for a simple square room, 10% if you have doorways, columns or a quarter-turn pattern.
Direction arrows matter. Every carpet tile has an arrow on the back. Lay them all the same way (monolithic) for a broadloom look, or rotate every other tile 90° (quarter-turn) to disguise soiling and slight shade variation between boxes. Quarter-turn is the safer choice for a busy room; monolithic shows dye-lot differences fastest.
- Find the centre of the room and dry-lay from there so borders are balanced.
- Use pressure-sensitive tabs or releasable adhesive, not full-spread glue.
- Cut face-up with a hook blade against a straightedge.
- Keep a full box spare — replacing one stained tile beats replacing a room.
Comparing to hard flooring? Run the numbers with the square footage calculator, vinyl tile calculator or the installation cost calculator.
Frequently asked questions
How many 24x24 carpet tiles do I need?
Divide the room square footage by 4, then add 5–10%. A 300 sq ft room needs 75 tiles plus waste, so 79–83 tiles.
How many carpet tiles are in a box?
Most 24x24 carpet tile ships 12–20 tiles per box, covering 48–80 square feet. Check the box coverage rather than the tile count.
Do carpet tiles need glue?
Most modern carpet tiles use peel-and-stick tabs or a releasable pressure-sensitive adhesive so individual tiles can be lifted and replaced.
Carpet tile or broadloom carpet?
Carpet tile costs a little more per square foot but installs without a stretcher, wastes far less on odd-shaped rooms, and lets you replace damaged squares one at a time.
Related calculators
- Tile Cost EstimatorTotal project cost: tile, grout, mortar, trim, and labor.
- Flooring Square Footage CalculatorAdd rooms, L-shapes and circles for one running square-foot total.
- Ceiling Tile CalculatorDrop-ceiling tiles, main tees, cross tees and wall angle.
- Carpet CalculatorSquare yards of 12 ft roll carpet, seams, waste, pad and tack strip.
- Vinyl Tile & LVP CalculatorLVT, vinyl plank and peel-and-stick boxes by coverage.
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.