Tile measuring guide & FAQs
Measuring an uneven backsplash
Measure the backsplash in separate rectangles: behind the sink, along the main counter and behind the range if the tile rises higher there. Enter each section individually. A 10-foot-wide run under cabinets with an 18-inch height is 15 square feet, while a 3-foot by 2.5-foot range section adds another 7.5 square feet.
Plan small-tile cutting and pattern waste
Subway tiles often require trimming around outlets, edges and upper cabinets. Start with a sensible extra allowance; change it as needed to suit your layout and tile fragility. A herringbone design can require more corner cuts than straight-set tile, but the waste setting remains your choice, not a guaranteed prediction.
What this estimate does not cover
Backsplash adhesive, grout, waterproofing in wet areas, edge trim, sealant and electrical work are separate from tile quantities. Use manufacturer specifications for grout and mortar coverage and consult qualified installers when appropriate.
Frequently asked questions
How do I measure between cabinets and counters?
Measure the visible backsplash width and height in each stretch separately. If the height changes behind the range, make that a second zone rather than using one average height.
Should I subtract outlets?
Outlet boxes are generally small relative to the overall area and require extra cuts. Leaving them in the area estimate is often a practical conservative choice; use the openings field only for large untiled areas.
How accurate is this tile calculator?
The measured area and box rounding follow explicit formulas. Tile cuts, uneven walls, product sizes, coverage labels and installation methods can change the actual amount needed, so use the result as a purchase-planning estimate.
Method & sources: The formulas are documented in our methodology. Reference guidance: Home Depot — how to lay tile and backsplash measurements. Retail guidance is informational, not a partnership or endorsement. Updated Nov 3, 2026.