Calculator Inputs
Enter one to three backsplash sections. Use cutouts for windows or large gaps. Heights are in inches; lengths are in feet.
Example Data Table
Sample inputs to show how the estimate behaves.
| Layout | Total run (ft) | Height (in) | Tile size (in) | Waste | Estimated area with waste (sq ft) |
|---|---|---|---|---|---|
| Single wall | 10 | 18 | 3 × 6 | 10% | 13.75 |
| Two walls | 16 | 18 | 12 × 12 sheet | 12% | 26.88 |
| Three sections with cutouts | 20 | 18 | 4 × 12 | 15% | 31.63 |
Formula Used
- Section area (sq ft) = Length(ft) × Height(in) ÷ 12
- Gross area = Area(A) + Area(B) + Area(C)
- Net area = max(Gross area − Cutouts, 0)
- Area with waste = Net area × (1 + Waste% ÷ 100)
- Tile/Sheet area = Width(in) ÷ 12 × Height(in) ÷ 12
- Tiles/Sheets needed = ceil(Area with waste ÷ Tile/Sheet area)
- Boxes needed = ceil(Tiles/Sheets needed ÷ Items per box)
- Thinset bags = ceil(Area with waste ÷ Thinset coverage)
- Grout bags = ceil(Area with waste ÷ Grout coverage)
- Trim length = Sum of section lengths (or custom)
- Total cost = Materials subtotal + Labor subtotal
Coverage rates vary by trowel size, tile thickness, grout width, and surface conditions.
How to Use This Calculator
- Measure each backsplash run length in feet.
- Measure backsplash height in inches (often 18).
- Add extra sections for returns or separate walls.
- Enter cutouts for windows or large gaps.
- Pick tile or mosaic sheet and enter its size.
- Choose pricing style that matches your receipt.
- Set waste percentage for cuts and breakage.
- Adjust thinset, grout, trim, and optional sealer.
- Include labor and removal if you want a full budget.
- Press Calculate, then download CSV or PDF if needed.
Professional Guide to Kitchen Backsplash Estimating
1) Why accurate area matters
A backsplash looks small, but errors add up quickly. A 10 ft run at 18 in high is 15.0 sq ft before waste. That difference can mean an extra box, another bag of thinset, and a second store trip.
2) Converting measurements the right way
This calculator converts inches to feet so the math stays consistent. Area for each section uses Length(ft) × Height(in) ÷ 12. If your height varies behind a range hood, enter a separate section for that taller portion.
3) Handling windows, outlets, and gaps
Most outlets are small and usually ignored in takeoffs, but windows and large openings should be deducted. Use cutouts in square feet for big gaps. A 2 ft × 3 ft window removes 6.0 sq ft, which can reduce tile and grout noticeably.
4) Choosing a realistic waste percentage
Waste covers cuts, breakage, and pattern matching. Straight stacked layouts often work with 10–12%. Diagonal patterns, glass, or many corners can push 15–20%. If you are mixing trims and listellos, add a few extra pieces beyond the waste rate.
5) Tile versus mosaic sheet planning
Individual tiles are counted by tile area, while mosaic sheets are counted the same way using the sheet dimensions. A 12 in × 12 in sheet equals 1.0 sq ft. If a box contains 10 sheets, one box covers about 10 sq ft before waste.
6) Pricing methods that match how stores sell
Some products price per square foot, others per tile, and mosaics often price per sheet or box. Select the option that matches your receipt so your estimate aligns with checkout totals. The calculator also reports boxes needed for purchasing convenience.
7) Setting materials and coverage assumptions
Thinset and grout coverage depend on trowel notch, tile thickness, grout width, and surface flatness. Typical thinset coverage for small wall tile might be 40–70 sq ft per bag, while grout can vary widely. Always verify your product label, then adjust the coverage fields.
8) Budgeting trim, labor, and removal
Edge profiles are often priced per linear foot. Auto-trim uses the total run length, but you can enter a custom value for only exposed edges. Labor is applied to net area, and optional removal helps plan full-scope budgets when replacing existing finishes.
FAQs
How high should I measure a standard backsplash?
Measure from the countertop to the bottom of upper cabinets. Many kitchens land near 18 inches, but confirm each wall because cabinets, windows, and range hoods can change the height.
Should I subtract electrical outlets as cutouts?
Usually no. Outlet holes are small, and waste tiles typically cover them. Subtract only large openings like windows, pass-throughs, or areas you will intentionally leave untiled.
What waste percentage is best for patterns?
Start at 10–12% for simple stacked layouts. Use 15% for diagonals or many corners. Go up to 20% for fragile glass, complex mosaics, or heavy pattern matching requirements.
How do I estimate mosaic sheets per box?
Look at the carton label. Enter the sheet size (often 12×12 inches) and sheets per box. The calculator converts sheet area to square feet, then rounds up to whole boxes.
Why does thinset coverage vary so much?
Coverage changes with trowel notch size, wall flatness, tile back pattern, and how aggressively you key in mortar. Use manufacturer guidance first, then adjust based on your installer’s method.
Do I need sealer for every backsplash?
No. Porcelain and many glazed ceramics do not need sealer. Natural stone and some unglazed materials may benefit from sealing. If unsure, follow the tile supplier’s care instructions.
Should labor be calculated on area with waste?
Labor usually follows installed area, not purchase area. This calculator applies labor to net area before waste to better reflect installation scope. If your contractor prices differently, adjust the labor rate to match their quote.