Backsplash Tile Calculator
Calculates kitchen backsplash tile requirements across countertop runs (standard 18" splash height), cooktop tall splash zones (30"–36" height), electrical outlet cutouts, and edge trims.
Formula
Total Sq Ft = (Linear Ft × (Height ÷ 12)) + (Cooktop Extra Sq Ft); Sheets/Boxes = Ceil(Total Sq Ft × (1 + Waste %))
1. Standard Run Area = Counter Linear Feet × (Splash Height in ÷ 12) 2. Cooktop Accent Area = (Cooktop Width in ÷ 12) × (Cooktop Extra Height in ÷ 12) 3. Net Backsplash Area = Standard Run Area + Cooktop Accent Area 4. Total Area with Waste = Net Area × (1 + Waste %) 5. Sheets / Boxes = Ceil(Total Area with Waste ÷ Unit Coverage)
Inputs
- Countertop Run Length
- Standard Backsplash Height
- Cooktop Extra Height (Behind stove)
- Cooktop / Range Width
- Tile Format
Worked example
Installing 3x6 white subway tile with 18" standard backsplash plus an 18" high section behind a 30" stove.
Outcome: Standard run is 24 sq ft. Cooktop accent adds 3.75 sq ft (27.75 net sq ft total). With 12% waste (31.08 sq ft effective), you need 3 boxes (12.5 sq ft/box) for a total of 37.5 sq ft purchased. Schluter Jolly trim: 2 eight-foot sticks.
Should I use unsanded or sanded grout for subway tile backsplashes?
For grout joints 1/8 inch or narrower (standard for subway tile and mosaics), use unsanded or all-in-one pre-mixed grout to prevent scratching delicate glazed or glass tile surfaces.