Quick answer: Measure the area in square feet, then multiply by 8 for standard 3x6 insubway tile (that’s how many fit in a square foot) and add 10% waste for a running-bond layout. A typical 15 sq ft kitchen backsplash needs about 132 subway tiles once you include waste.
Subway tile is the most popular wall tile in US kitchens and bathrooms, and it’s sold by the box, not the exact piece — so you need a reliable count before you shop. This guide gives you the per-square-foot number for every common subway size, the right waste percentage for each layout, and a worked example you can copy. To skip the arithmetic, drop your measurements into the tile calculator and it does all of this for you.
Step 1: Find your square footage
Subway tile goes on walls, so measure the surface you’re covering, not the floor. Multiply width × height in feet for each area, add the areas together, and subtract large openings like a window or a run of cabinets. For a backsplash, measure from the countertop to the underside of the upper cabinets.
Need a refresher on measuring? See how to calculate backsplash tile and how to calculate wall tile for the full method, including how to handle outlets and windows.
Step 2: How many subway tiles per square foot
One square foot is 144 square inches. Divide that by the area of a single tile to get the count. Here are the common subway sizes:
| Subway tile size | Area per tile | Tiles per sq ft |
|---|---|---|
| 2 x 8 in | 16 sq in | 9 |
| 3 x 6 in (classic) | 18 sq in | 8 |
| 3 x 12 in | 36 sq in | 4 |
| 4 x 8 in | 32 sq in | 4.5 |
| 4 x 12 in | 48 sq in | 3 |
| 4 x 16 in | 64 sq in | 2.25 |
These are exact nominal counts. Because tiles rarely divide evenly into a wall, always round up and then add waste on top. For other sizes, see our full tiles-per-square-foot chart.
Step 3: Add waste for your layout
Subway tile is defined by its layout as much as its size, and the pattern decides how much you waste in cuts:
| Layout | Recommended waste |
|---|---|
| Running bond (50% offset brick) | 10% |
| Stacked (straight grid) | 10% |
| One-third offset | 10% |
| Herringbone | 15% |
| Vertical herringbone / chevron | 15–20% |
Add more if your area is small (a few square feet), has lots of corners, or if you’re a first-time tiler. More on this in how much extra tile to buy and our guide to tile layout patterns.
Worked example: a kitchen backsplash
The space: a backsplash running 10 ft along the counter, 18 in (1.5 ft) tall, in classic 3x6 subway tile, running-bond layout.
- Area: 10 ft × 1.5 ft = 15 sq ft
- Tiles before waste: 15 × 8 = 120 tiles
- Add 10% waste: 120 × 1.10 = 132 → 132 tiles
- Boxes: if a box holds 40 tiles, that’s 132 ÷ 40 = 3.3 → buy 4 boxes
Boxes are sold by square footage, not tile count, so check the coverage printed on the box. Our guide to how many boxes of tile you need walks through that conversion.
Don’t forget grout, trowel, and dye lot
- Grout: subway tile has lots of joints per square foot, so it uses more grout than large-format tile — estimate it with our grout coverage guide.
- Trowel: most 3x6 subway tile sets with a 1/4 in notch — see what size trowel to use.
- Dye lot: buy all your tile at once and check the lot number on every box so the color matches across the wall.
Frequently asked questions
- How many subway tiles are in a square foot?
- A standard 3x6 inch subway tile covers 18 square inches, so there are 8 tiles in a square foot (144 ÷ 18 = 8). For 4x8 subway tile you get 4.5 per square foot, and for 4x12 you get 3 per square foot. Always round up and add waste on top.
- How much subway tile do I need for a backsplash?
- Measure the backsplash length × height in feet to get square footage, then multiply by 8 for 3x6 tile (or the right factor for your size) and add 10% waste for a straight running-bond layout. A typical 10 ft kitchen backsplash about 18 in tall is roughly 15 sq ft, or about 132 subway tiles with waste.
- How much extra subway tile should I buy?
- Add 10% for a standard brick (running bond) layout, 15% for herringbone, and up to 20% for a vertical herringbone or any busy pattern with lots of cuts. Buy it all in one dye lot so the color matches, and keep a few spare tiles for future repairs.
- What size is a subway tile?
- The classic subway tile is 3x6 inches, but the look now covers many sizes — 4x8, 4x12, 2x8, and large-format 4x16 are all common. The calculation method is the same for any of them: find your square footage, divide by the area of one tile, and add waste.
- Does a herringbone subway layout need more tile?
- Yes. Herringbone and chevron layouts create far more cut tiles at the edges, so they waste more. Plan for about 15% extra for standard herringbone and up to 20% for tighter angles or small areas, versus 10% for a simple running-bond wall.
Ready to get your exact number? Enter your wall measurements and subway tile size in the free tile calculator — it adds the right waste and tells you how many tiles and boxes to buy.
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