ToolwickHow to Use This Shower Wall Tile Calculator
Choose how many walls you are tiling, then enter the shower width, depth and the height you plan to tile. Add the tile size, grout joint, thickness and a waste allowance (pick a layout pattern or drag the slider), then list any niches or window and door openings. Press Calculate to see tiles to order, boxes, grout, thinset, backer board and a wall-by-wall breakdown that you can copy.
Why This Matters
A shower is the worst place to run short of tile. Tile lots vary in shade and size, so a few extra pieces from a different batch can show up as a visible stripe once the wall is grouted. Many lines are also discontinued within a year or two. A standard 60 × 32 inch alcove tiled to 80 inches is roughly 69 square feet of wall. At $3 to $8 per square foot for porcelain, a 15% cushion costs about $30 to $85. A second order, plus shipping and a mismatched lot, usually costs more than that.
Ordering too much is a problem too. Large-format porcelain can run $10 or more per square foot, and a miscounted niche or a wall you were not going to tile can add hundreds of dollars. Homeowners planning a weekend remodel, contractors writing quotes, and designers comparing a 3 × 6 subway tile against a 12 × 24 all need the same number: net tiled area, converted into whole tiles and whole boxes. Keep a few spare tiles after the job as well. They are the only way to repair a cracked tile years later with a matching shade.
How It's Calculated
Each tiled wall is a rectangle, so its area is width × height. Side walls use the shower depth, and the back wall uses the shower width. Niches change the total in two ways: the opening is deducted from the wall, but the niche's back, sides, top and bottom all need tile, so those surfaces are added back. Other openings are simply subtracted.
Tile footprint = (tile width + joint) × (tile length + joint)
Tiles = Net area ÷ footprint × (1 + waste%), rounded up
Grout (lb) = area (sq ft) × (L + W) ÷ (L × W) × joint × thickness × 1.86 × 1.10
Grout uses the widely published sanded-grout coverage formula with all dimensions in inches, plus 10% for spillage. Thinset coverage per 50 lb bag is estimated conservatively from the tile's largest side: about 90 sq ft up to 6 in, 70 sq ft up to 12 in, 55 sq ft up to 18 in and 45 sq ft above that, plus 10%. Backer board assumes 3 × 5 ft sheets (15 sq ft) with 10% added. Every quantity is rounded up, never down.
The wall breakdown also shows a full-tile grid for each wall, which helps you plan cuts. These estimates follow common industry practice (the TCNA Handbook, ANSI A108/A118 mortar guidance and IRC R702.4 for tile backers). Local codes vary. This tool is a material estimate and not engineering, permit or inspection approval. Follow your tile, membrane and backer manufacturers' instructions, and waterproof the shower as your local code requires.
Worked Example
The default values show an alcove 60 in wide and 32 in deep, tiled to 80 in with 12 × 24 in tile and a 1/8 in joint. The tile is 5/16 in thick, laid with the long side horizontal, and the shower has one 12 × 24 × 4 in niche.
- Walls: back 60 × 80 = 4,800 in²; two sides 32 × 80 × 2 = 5,120 in²; gross 9,920 in² = 68.89 sq ft.
- Niche: opening deducted 288 in²; interior added 288 + 192 + 96 = 576 in²; net change +288 in².
- Net area: 9,920 − 288 + 576 = 10,208 in² = 70.89 sq ft (6.59 m²).
- Footprint: 12.125 × 24.125 = 292.52 in², so 10,208 ÷ 292.52 = 34.9 tiles.
- Waste at 10%: 34.9 × 1.10 = 38.4, rounded up to 39 tiles. In boxes of 8, that is 5 boxes (40 tiles).
- Grout: about 0.8 lb. Thinset: 2 bags. Backer board: 6 sheets.
Tips & Common Mistakes
- Measure each wall separately. Check the top, middle and bottom, because out-of-square walls are common. Use the largest measurement.
- Raise the waste for complex layouts. Diagonal and herringbone patterns, and large rectified tile with lots of cuts, need 15–20%. Straight stacks can often use 10%.
- Buy from one dye lot. Order everything at once and check the lot number on every box. Open several boxes and mix tiles as you install.
- Start the layout from the center. Dry-fit the first row so you avoid slivers narrower than half a tile at the corners.
- Do not forget the ceiling, curb or bench. This calculator covers walls and niches only. Add those surfaces separately, and confirm waterproofing is rated for your assembly.
Frequently Asked Questions
How much extra tile should I buy for a shower?
Add about 10% for straight layouts, 12–15% for offset or diagonal patterns and up to 20% for herringbone or heavily cut tile. Showers have many cuts at corners, niches and valves, so staying near the upper end of each range is safer.
How many square feet of tile do I need for a 60 × 32 inch shower?
Tiled to 80 inches on three walls, the gross wall area is about 69 square feet. The total shifts with height and niches. Use the calculator for your exact figures and add your waste percentage on top.
Do I subtract the niche from the wall area?
You subtract the opening, but you must also tile the inside of the niche. The calculator deducts the opening and adds the back, sides, top and bottom. A typical niche therefore adds a small amount of tile rather than saving any.
How high should shower wall tile go?
IRC R307.2 calls for a smooth, nonabsorbent surface at least 72 inches above the drain, though local codes vary. Many people tile to 80 inches or to the ceiling for a cleaner look and better moisture protection.
Does this include the shower ceiling and floor?
No. It covers the walls and niches only. If you plan to tile the ceiling, run the calculator again with the ceiling dimensions as a single wall and add the results. The shower floor is a separate job with its own tile size and slope.
How much grout do I need for shower walls?
For large tile with 1/8 inch joints, even a 70 sq ft shower uses about one pound. Small mosaics with wide joints can use 10 times that. The calculator uses your actual tile size, joint and thickness, then adds 10% for waste.
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