Details
Type feet and inches like 12'6" or just 12.5. Everything is saved on this device, so your list is still here in the shop.
About the tile and flooring calculator
This calculator tells you how many tiles to buy for a floor, a wall or a backsplash — or how many boxes of laminate, vinyl plank or wood flooring. It counts the grout lines between tiles, and adds the right amount of extra for cuts and breakage, which depends on the pattern you lay.
Enter the area as one or more rectangles (subtract a kitchen island or a bathtub if you like), then the tile size. If you know how many tiles come in a box, you also get the number of boxes and the cost.
How to use it
- Choose Feet & inches or Metres & cm
- Enter the length and width of the floor (for a wall: its width and height)
- Choose Tiles or Flooring sold by the box
- For tiles: enter the tile size and the grout gap
- Pick the layout — the extra for cuts changes with it
- Add tiles per box and a price to see the boxes and the cost
How many tiles per 100 square feet
With a 1/8 in (3 mm) grout line:
| Tile size | Tiles for 100 sq ft | With 10% extra |
|---|---|---|
| 4 × 4 in | 847 | 931 |
| 3 × 6 in (subway) | 753 | 828 |
| 6 × 6 in | 384 | 423 |
| 12 × 12 in | 98 | 108 |
| 6 × 24 in (plank) | 98 | 108 |
| 12 × 24 in | 50 | 55 |
| 18 × 18 in | 44 | 49 |
| 24 × 24 in | 25 | 28 |
How much extra to buy
Some tiles are always cut at the walls, and some break. How much extra you need depends on the layout:
| Layout | Extra to add |
|---|---|
| Straight (grid) in a simple room | 5–10% |
| Straight, with many corners | 10% |
| Brick / offset pattern | 10% |
| Diagonal (45°) | 15% |
| Herringbone or chevron | 20% |
Large tiles waste more per cut, so stay at the top of the range with them. Keep a few spare tiles after the job: if one cracks in five years, the same tile may no longer be sold.
Flooring sold by the box
Laminate, vinyl plank (LVP) and engineered wood are sold in boxes that cover a fixed area — often 18 to 24 sq ft (about 2 m²). The number is on the box or the product page. Choose Flooring sold by the box, enter it, and the calculator gives the boxes, with extra for cuts.
Tips for tiling
- Buy all tiles from the same batch (lot number on the box) — colour can change between batches.
- Measure the room at the widest points and round up.
- Walls: use the width and height of each tiled wall, and subtract windows.
- The calculator counts tiles only — grout, adhesive (thinset) and spacers are extra.
Frequently asked questions
How many tiles do I need for 100 square feet?
With 12 × 12 inch tiles: about 98 tiles, or 108 with 10% extra for cuts. Smaller tiles need many more — 384 tiles of 6 × 6 inches.
How much extra tile should I buy?
10% for a normal straight layout, 15% for diagonal and 20% for herringbone. Rooms with many corners, pipes or cabinets need more cuts, so stay on the high side.
Do I count the grout lines?
Yes — and the calculator does. With small tiles, the grout lines take up a real part of the floor: with 4 × 4 in tiles and 1/8 in joints, about 6% of the floor is grout.
How many boxes of laminate flooring do I need?
Divide the room's square footage (plus 10% extra) by the area one box covers. A 12 × 12 ft room is 144 sq ft; with 10% that is 158 sq ft; with 20 sq ft boxes that is 8 boxes.
How do I calculate tiles for a wall or backsplash?
Use the wall's width and its tiled height as length and width. Subtract windows and the stove area with Subtract. Small mosaic sheets are usually sold by the sheet — enter the sheet size as the tile size and a grout gap of 0.
Can I return leftover tiles?
Many shops take back unopened boxes — ask before you buy. It is often cheaper to buy one box too many and return it than to need a second trip.
Good to know
- Your room and settings are saved in this browser, so your list is ready in the shop
- Press Copy the list to send it to yourself
- Nothing is sent anywhere — it works in your browser
Related tools
- Square Footage Calculator — the area of any room
- Paint Calculator — gallons of paint for the walls
- Wallpaper Calculator — rolls of wallpaper
- Concrete Calculator — for a slab under the floor
- Mulch, Soil & Gravel Calculator — for the garden
- Unit Converter — inches, centimetres and more
