How Many Tiles for a Backsplash? Measuring, Waste, and Layout

A kitchen backsplash is a small space with an outsized ability to waste money. Tile is sold in boxes, cuts create offcuts, and a pattern that does not divide evenly into your wall can push the waste factor from a tidy five percent to a costly fifteen. Ordering the right quantity comes down to careful measurement and an honest waste allowance.

Measure the Wall, Not the Room

The backsplash runs between the countertop and the upper cabinets, so you are measuring that strip — not the whole kitchen wall. A typical strip is about 18 to 24 inches tall. Measure the height in inches, then measure the full run of countertop in inches.

Multiply height by length to get square inches, then divide by 144 to convert to square feet. A 20 foot counter run at 20 inches tall is 240 inches by 20 inches, or 4,800 square inches — about 33.3 square feet.

Subtract the Gaps, Add the Extras

Backsplashes are rarely one continuous rectangle. Windows, outlets, and range hoods sit in the middle of the run. Subtract the large openings, but do not subtract outlets — those cutouts are surrounded by tile and the offcuts are usually unusable.

Then add the areas people forget: behind the stove if you are tiling higher there, the return walls at each end of the counter, and any window sill faces you plan to cover.

Choosing a Waste Factor

Tile type	Suggested waste	Why
Large format (12×12+)	10%	Breaks waste more area
Standard subway	8–10%	Offcuts reusable, cuts frequent
Small mosaic	10–15%	Fiddly cuts around outlets
Herringbone / diagonal	15%	Angled cuts lose more tile

Work Out the Boxes

Tile is sold by the box with a coverage figure printed on the label, often something like 5.4 square feet per box. Take your total square footage including waste, then divide by the box coverage and round up to the next whole box.

Our 33.3 square foot wall with a 10 percent waste factor becomes 36.6 square feet. At 5.4 square feet per box that is 6.8 boxes, so you order seven. Always round up — running short mid-job means a return trip and the risk that the next batch is a slightly different dye lot.

Dye Lots and Spares Matter

Buy all boxes at once so the dye lot matches across the whole job.
Keep one spare box for future repairs — matching a discontinued tile later is nearly impossible.
Check boxes on delivery for breakage and shade differences before you start cutting.
Store spares flat and dry so they stay usable.

Frequently Asked Questions

How much extra tile should I buy for a backsplash? Between 8 and 15 percent depending on the tile size and pattern, with larger and angular layouts needing more.

Do I count the area behind the stove? Yes, if you are tiling up to or behind the hood rather than stopping at the standard cabinet line.

Should I subtract for outlets? No. The cutouts consume tile without yielding reusable offcuts, so leave them in the total.

Can I buy one box extra and return it? Only if the store allows returns on unopened boxes, and even then keep one for future repairs.

Square Footage First, Then the Order

The entire backsplash estimate rests on two measurements — the height of the strip and the length of the run — turned into square feet, adjusted for gaps and waste, then divided by the box coverage. Use our area calculator to get the square footage exactly right, then add your waste percentage. A five-minute measurement session up front is the difference between a single tidy order and a project stalled halfway through waiting on a second delivery.