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Tile Calculator
Type your room size and tile size and get the exact tiles, boxes and grout bags to buy, with the right waste added for straight, diagonal and herringbone layouts.
How Many Tiles Do You Need?
Measure your floor, pick your tile and layout, and get the full shopping list.
TILE FLOOR
Standard pickLayout waste included, the normal buy
Safe pick5% more for breaks and future repairs
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How It Works
Step 1: Measure the floorMeasure the room length and width in feet, or type the square feet if you already know them.
Step 2: Pick tile and layoutChoose your tile size, layout pattern and grout joint width. Diagonal and herringbone layouts cut more tiles, so they add more waste.
Step 3: Buy the listOrder the tiles, boxes and grout bags shown, all from one batch, and keep the spare tiles for future repairs.
Formula Used in This Calculator
This calculator uses the standard tile counting method:
Floor area = Room length x Room width Tile area = Tile length x Tile width / 144 (sq ft) Tiles needed = Floor area / Tile area, rounded up Tiles to buy = Tiles needed + waste (10% straight, 15% diagonal, 20% herringbone) Boxes to buy = Tiles to buy / Tiles per box, rounded up Grout is counted from the tile size and joint width: small tiles and wide joints use more grout per square foot, and the count is given in 25 lb bags.Related Tools
Kitchen Backsplash Tile CalculatorTiling a backsplash instead? Count splash tiles with openings for outlets subtracted. Room Size CalculatorWork out the exact square feet of any room, plus the flooring amount to buy. Rug Size CalculatorFind the perfect rug size for your new tile floor, with a visual layout.
Tile Chart (Tiles for 100 Sq Ft, With 10% Waste)
| Tile size | Tile area | Tiles for 100 sq ft |
|---|---|---|
| 12 x 12 in | 1 sq ft | 110 |
| 12 x 24 in | 2 sq ft | 55 |
| 18 x 18 in | 2.25 sq ft | 50 |
| 24 x 24 in | 4 sq ft | 28 |
| 6 x 36 in plank | 1.5 sq ft | 74 |
3 Tile Rules That Save Money
- Always add the waste: cuts, breaks and one cracked tile years from now all come out of the extra. Straight layouts need 10 percent, diagonal 15, herringbone 20.
- Buy every box from one batch: tile shade shifts a little from lot to lot, and a mixed floor shows it in daylight.
- Order all of it now: tile lines get discontinued fast, and a spare box in the closet is the cheapest repair plan there is.
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Tile Calculator FAQs
How many tiles do I need for a 12 x 10 floor?A 12 x 10 ft floor is 120 sq ft. With 12 x 24 in tiles in a straight layout, you need 66 tiles, sold as 7 boxes of 10, plus about 1 bag of grout at a 1/8 in joint.
How much extra tile should I buy?Buy 10 percent extra for a straight layout, 15 percent for diagonal and 20 percent for herringbone. Rooms with many corners and cuts sit at the top of the range.
What is the difference between this and the backsplash calculator?This calculator is built for floors and large areas, with boxes and grout bags counted. The Kitchen Backsplash Tile Calculator is built for the wall strip between counters and cabinets and subtracts outlet and window openings.
How much grout do I need?Grout depends on tile size and joint width. Big tiles with a tight 1/16 in joint can use under 10 lb per 100 sq ft, while small tiles with a 1/4 in joint can pass 40 lb. This calculator counts it for your exact picks in 25 lb bags.
What Our Readers Say
★★★★★
Seven boxes for our kitchen floor, exactly right, with four tiles left over for spares. The grout count was spot on too.
Megan T., Nashville
★★★★★
The herringbone waste line saved my bathroom project. Every other calculator told me 10 percent and I would have run short on a Sunday.
Devon A., Atlanta
★★★★★
Typed my square feet straight in for an odd shaped hall and got tiles, boxes and grout in one go. No spreadsheet needed.
Carla J., Houston
★★★★★
Bought all boxes from one batch like the rules said. Our floor has one even shade from wall to wall, no patchy corner.
Omar S., Phoenix
★★★★★
Plank tiles for a long studio floor. The chart matched the store count, and the safe pick left me a calm spare half box.
Ingrid L., Chicago
★★★★★
First tile job in our first apartment. Clear numbers, no jargon, and the floor looks like a pro did it.
Tyler B., Kansas City
Still Not Sure? Ask Us
Send us your room size and the tile you picked, and we will check the tile and grout count for free.
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