Subway Backsplash Tile Calculator: How Many Tiles & Boxes Do I Need? (2026 Cost Guide)
Ceramic or glass subway tile for kitchen and bathroom backsplashes.
Most kitchen backsplashes run 18 inches from the countertop to the bottom of the upper cabinets, so enter the total run of wall length and 1.5 ft of height. Measure each wall section separately (and behind the range hood up to the hood if you're tiling higher) and add them together. Subtract windows only if they're large — outlet cut-outs don't meaningfully reduce the tile count.
1Measure the space
2Tile size & layout
Recommended: 10% for straight/offset, 15% for diagonal & herringbone.
3Packaging & price
Printed on the box. 0 = sold individually.
Your Subway Backsplash Tile estimate
Area incl. waste
19.8 sq. ft
tiles needed
154
boxes to buy
2
Material cost
$80
- DIY — materials only$80
- Installation labor (pro)$216 – $450
- Hire a pro — total installed$296 – $530
Labor at $12–$25 per sq. ft (US average). Doing it yourself saves roughly $216–$450.
Material shopping list
| Subway Backsplash Tile (3" × 6")154 tiles · 20 sq. ft purchased | 2 boxes |
| Thinset mortar (50 lb bags)≈ 50 sq. ft per bag with a 1/2" notch trowel | 1 bags |
| Sanded grout (25 lb bags)Approx. for 1/8" joints — check the coverage chart | 1 bags |
18 sq. ft · Offset / Brick · 10% waste. Buy all boxes from the same lot.
How many tiles do I need? Quick-reference table
Based on 3" × 6" tiles with 1/16" joints, 10 sq. ft per box and $4.00/sq. ft material. "Offset / Running bond" uses 10% waste; diagonal/herringbone uses 15%.
| Size | Area + 10% | tiles | boxes | tiles @ 15% | Material | Installed (pro) |
|---|---|---|---|---|---|---|
| 8×1.5 ft (12 sq. ft) | 13.2 sq. ft | 103 | 2 | 108 | $80 | $224–$380 |
| 10×1.5 ft (15 sq. ft) | 16.5 sq. ft | 128 | 2 | 134 | $80 | $260–$455 |
| 12×1.5 ft (18 sq. ft) | 19.8 sq. ft | 154 | 2 | 161 | $80 | $296–$530 |
| 15×1.5 ft (22.5 sq. ft) | 24.8 sq. ft | 192 | 3 | 201 | $120 | $390–$683 |
| 20×2 ft (40 sq. ft) | 44 sq. ft | 342 | 5 | 357 | $200 | $680–$1,200 |
The subway backsplash tile formula, step by step
- Measure the area. Multiply wall length × backsplash height in feet. Measure each section separately and add them for L-shapes.
- Add waste. Add 10% for straight or offset layouts and 15% for diagonal or herringbone.
- Find coverage per tile. (tile length + joint) × (tile width + joint) ÷ 144 = sq. ft per tile.
- Count tiles. Divide the area including waste by the coverage per tile and round up.
- Convert to boxes. Divide the area including waste by the sq. ft per box and round up to whole boxes.
Worked example — a 12 × 1.5 ft area is 18 sq. ft. Adding 10% gives 19.8 sq. ft. Each 3" × 6" tile with a 1/16" joint covers 0.129 sq. ft, so you need 154 tiles — 2 boxes at 10 sq. ft each.
Subway Backsplash Tile cost guide (2026)
- Material: $2.00–$15.00 per sq. ft (calculator default $4.00).
- Professional labor: $12–$25 per sq. ft. Backsplash labor is priced higher per sq. ft because of outlet cut-outs, edge trim and small areas. Many installers charge a $400–$600 minimum.
- Typical 12×1.5 project: $80 DIY vs. $296–$530 professionally installed.
Pro tips for subway backsplash tile
- Use a 1/16" joint for a classic look; handmade or irregular tiles need 1/8".
- Plan rows from the countertop up so the top row hides under the cabinet light rail.
- Buy bullnose or a metal edge profile to finish exposed ends — it's sold by the piece, not the box.
- Herringbone layouts produce many cuts along every edge: use 15% waste.
Subway Backsplash Tile FAQ
How many 3×6 subway tiles are in a square foot?
Without grout, 8 tiles cover one square foot (each is 0.125 sq. ft). With 1/16" grout joints the count drops to about 7.8 tiles per sq. ft.
How much subway tile do I need for a kitchen backsplash?
Multiply the backsplash length by its height. A typical 12 ft × 18" backsplash is 18 sq. ft — about 154 3×6 tiles (2 boxes) with a 10% overage.
What's the most common subway tile pattern?
The 50% offset running bond (brick pattern) is the classic look. Straight-stack and vertical stack feel more modern, and herringbone adds visual interest but uses more tile.
How much does it cost to install a tile backsplash?
Subway tile itself costs $2–$15 per sq. ft. Professional installation runs $12–$25 per sq. ft, and many installers have a job minimum of $400–$600 for small backsplashes.