What problem this solves
Standard tile estimators give you “backsplash area / tile area = tiles needed” without accounting for the fact that the backsplash isn’t a solid rectangle. The typical kitchen backsplash has 2–4 outlets, often a window over the sink, and a hood over the cooktop — all of which subtract from the tileable area. The deductions are small (often 5–10% of total area) but they matter when you’re ordering tiles by the box and trying to keep the count tight.
Pattern waste applies on top. A backsplash is small enough that a brick or herringbone pattern is more common than a full straight lay, so the waste factor is more important than for a floor install. The calculator combines both: deductions and pattern waste.
Who it’s for
- Kitchen designers specifying tile quantity for a reno quote
- Homeowners ordering tile online for a DIY install
- Tile installers quoting labour + materials on a kitchen job
- General contractors checking a tile quote
Why deductions matter
For a 3 m × 0.6 m backsplash (1.8 m²) with 3 outlets and a 0.5 m² window, the tileable area is roughly 1.8 − 0.05 − 0.5 = 1.25 m² — a 30% reduction. Without the deductions, the calculator would return 30% more tiles than you actually need, which is wasted money.
Limitations
- Outlet and switch sizes vary; calculator uses 12 × 9 cm as default.
- Window area assumes a single rectangular window; bay windows or multi-pane need more detail.
- No deduction for tile-trim pieces (edge trim, schluter profiles); add 2–3 tiles for trim.
- No accounting for corners (inside vs outside corner trims).
- Range/cooktop deductions should match the actual product dimensions, not just a guess.
Practical rules of thumb
For a U-shaped or L-shaped kitchen, the backsplash consists of multiple short walls. Measure each separately and add. For full-height splash (extending to the upper cabinet), use a height of 80–85 cm. For a window, measure the visible tileable area between the sill and the upper cabinet — the window itself is a deduction. Add 5% extra for breakage on glass tiles (more fragile than ceramic).