Backsplash Tile Calculator — How Much Tile Do I Need?
Enter your backsplash width, height, and tile size to get square footage, tile count, grout, thinset, and cost — with waste built in for your layout pattern.
How to Measure for a Backsplash
Measure the total width of counter you're tiling above, and the height from the countertop to the bottom of the upper cabinets — the industry standard is 18 inches, though a full-height backsplash running to the ceiling can be 24 to 36+ inches depending on your layout. Multiply width by height (in feet) to get your gross square footage.
Subtract large openings like a range hood or a window from that gross number, but leave standard outlets alone — your waste allowance already covers the small cuts needed around them.
Waste Factor by Layout Pattern
| Pattern | Waste Allowance | Why |
|---|---|---|
| Straight / Stacked | 10% | Simplest cuts, mostly along the edges |
| Brick / Offset | 12% | Row offsets create a few more partial pieces |
| Diagonal | 15% | Every edge tile is an angled cut |
| Herringbone | 20% | Most complex cuts and the most offcuts |
Common Backsplash Mistakes
- Underestimating pattern waste. Straight-lay waste percentages don't apply to diagonal or herringbone layouts — those patterns turn far more tile into offcuts.
- Forgetting the range hood or window cutout. Not subtracting a large opening means over-ordering tile for space you'll never fill.
- Buying tile from multiple dye lots. A reorder mid-project can come from a different batch with a visibly different shade.
- Ignoring outlet height when planning the layout. Grout lines that land right at outlet edges look unplanned — dry-lay the first row before committing to spacing.
- Skipping edge trim. An exposed tile edge without bullnose or metal trim chips easily and looks unfinished at the end of a run.
Frequently Asked Questions
How much tile do I need for a kitchen backsplash?
A standard kitchen backsplash (18 inches high, 10 feet of counter) needs about 15 sq ft of tile before waste. Add 10% for a straight layout, 12% for brick/offset, 15% for diagonal, or 20% for herringbone to get your purchase total.
What height should I measure for a backsplash?
Standard kitchen backsplash height is 18 inches, measured from the countertop to the bottom of the upper cabinets. A full-height backsplash that runs to the ceiling can be 24-36+ inches depending on your cabinet layout.
Do I subtract the range hood area from my backsplash tile order?
Yes — subtract large openings like a range hood or window from your gross wall area, but don't subtract small openings like standard outlets, since the waste factor already covers cuts around them.
How much extra tile should I order for waste?
10% for a straight/stacked layout, 12% for brick or offset patterns, 15% for a diagonal layout, and 20% for herringbone or other complex patterns — more intricate layouts create more cut pieces and more waste.
How many bags of grout do I need for a backsplash?
Most standard kitchen backsplashes use well under one full 25 lb bag. This calculator estimates grout weight using the same TCNA-style joint-volume formula as our dedicated Grout Calculator, based on your tile size and joint width — use the dedicated calculator instead if you want to fine-tune tile thickness or try a different bag size.