Free tool · for homeowners, tile setters and remodelers
Tile Calculator: How Many Tiles, Boxes and Grout Do I Need?
Add every floor, wall, backsplash or shower, pick the tile size and layout, and get the number of tiles and boxes to buy, the grout you need and the cost, in square feet or square meters.
Tile Calculator
- Area 1120 sq ft
Tile count uses each tile plus its grout joint. Extra: 10% for straight and brick layouts and 15% for diagonal and herringbone, in line with a US tile distributor’s 10–15% guidance; buy from one batch (lot) so colors match. Grout is estimated for sanded grout from joint size and tile thickness; check the coverage chart on your grout bag.
How Many Tiles Do I Need?
Multiply each area’s length by its width for the square footage, divide by the size of one tile plus its grout joint, and add 10% extra for cuts and breakage, or 15% for diagonal and herringbone layouts. A 10 by 12-foot floor with 12 by 12-inch tile needs 118 tiles, or 130 with extra.
Checked against the sources below · How we build and test our calculators
How Many Tiles Do I Need for 100 Square Feet?
With 1/8-inch grout joints. Multiply by your area ÷ 100.
| Tile size | Tiles, no extra | With 10% extra | With 15% extra |
|---|---|---|---|
| 12 × 12 in | 98 | 108 | 113 |
| 12 × 24 in | 50 | 55 | 57 |
| 24 × 24 in | 25 | 28 | 29 |
| 18 × 18 in | 44 | 49 | 51 |
| 6 × 24 in | 98 | 108 | 113 |
| 6 × 6 in | 384 | 423 | 442 |
| 4 × 4 in | 847 | 931 | 974 |
| 3 × 6 in | 753 | 828 | 866 |
How to Calculate Tile for a Floor or Wall
- Measure: length × width of each floor or wall, in feet (or use the square footage calculator for odd shapes).
- Subtract anything you won’t tile: a tub, cabinets, a window.
- Divide by the area of one tile plus its grout joint.
- Add extra: 10% for straight or brick, 15% for diagonal or herringbone.
- Boxes: divide the total square feet by the square feet per box and round up.
Grout Calculator: Square Feet per 25 lb Bag
| Tile | 1/8 in joint | 1/4 in joint |
|---|---|---|
| 12 × 12 in | 373 sq ft | 191 sq ft |
| 18 × 18 in | 556 sq ft | 282 sq ft |
| 12 × 24 in | 495 sq ft | 251 sq ft |
| 6 × 24 in | 300 sq ft | 154 sq ft |
| 4¼ × 4¼ in | 206 sq ft | 109 sq ft |
| 1 × 1 in mosaic | 58 sq ft | 36 sq ft |
Polyblend Plus sanded grout, from Custom Building Products’ coverage chart (3/8 in thick tile; 1/4 in for 4¼ in and mosaic).
How Much Extra Tile to Buy by Layout
| Layout | Extra | Why |
|---|---|---|
| Straight or grid | 10% | Cuts only along the edges |
| Brick or offset (subway) | 10% | Half-tile cuts at each row end |
| Diagonal (45°) | 15% | Triangle cuts along every wall |
| Herringbone or chevron | 15% | Angled cuts on all sides |
Arizona Tile recommends buying 10% to 15% extra tile for any project. Keep a few spare tiles from the same lot for future repairs.
Add This Calculator to Your Website, Free
Tile stores, flooring showrooms and tile installers: let customers work out tiles, boxes and grout on your site, in your colors, with a button to request a quote.
Paste it into any page of your website as an “HTML” or “embed” block. It’s free, needs no account and collects no visitor data.
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Questions
How many tiles do I need?
Measure the length and width of each floor or wall, multiply for the square footage, divide by the area of one tile plus its grout joint, then add 10% for cuts and breakage (15% for diagonal or herringbone). A 10 × 12 ft floor with 12 × 12 in tile and 1/8 in joints needs 118 tiles, or 130 with 10% extra.
How many 12x12 tiles do I need for 100 square feet?
About 98 tiles with 1/8-inch grout joints, or 108 with 10% extra. With 12 × 24 in tile it is about 50 tiles, or 55 with 10% extra.
How many boxes of tile do I need?
Multiply your square footage by 1.10 (or 1.15 for diagonal layouts) and divide by the square feet per box printed on the label, then round up. 120 sq ft plus 10% is 132 sq ft; with 15.5 sq ft boxes that is 9 boxes.
How much extra tile should I buy?
A US tile distributor recommends 10% to 15% extra for any project. Use about 10% for straight or brick layouts and 15% for diagonal, herringbone or rooms with many cuts, and buy it all from the same production lot so the color matches.
How much grout do I need?
It depends on tile size, joint width and tile thickness. Custom Building Products’ chart shows a 25 lb bag of sanded grout covers about 373 sq ft of 12 × 12 in tile with 1/8 in joints, but only about 58 sq ft of 1 × 1 in mosaic.
How do I measure a shower or bathroom wall for tile?
Measure each wall’s width and the height you will tile, enter each wall as its own area, and subtract windows, niches or the tub with the untiled-area box. Add the floor and any backsplash as separate areas.
How many tiles do I need per square meter?
About 5.5 tiles of 30 × 60 cm, 2.8 tiles of 60 × 60 cm or 11 tiles of 30 × 30 cm per square meter with 3 mm joints, before adding 10% extra.