Quick answer
Calculate each tiled surface separately, subtract only meaningful areas that will not receive tile, add a visible waste allowance, then round to complete boxes.
Step by step
- List tiled surfaces. Separate floor, shower walls, backsplash and other areas.
- Measure each rectangle. Use consistent units.
- Subtract exclusions. Remove large openings or untiled areas.
- Add waste and round. Use the exact box coverage for the selected tile.
Formula or rule of thumb
Example
A 60 ft² bathroom floor with 12% planning waste requires 67.2 ft² before package rounding.
Common mistakes
Do not combine floor and wall areas when they use different tile, box coverage or layout patterns.
Planning note: product yields, installation methods, site conditions and local requirements can change the final quantity. Use the exact manufacturer or supplier information before purchasing.
FAQ
Should shower niches be measured separately?
Yes. Complex cuts can affect waste and should be visible in the plan.
Do I subtract the toilet footprint?
For basic planning, small fixture areas are often left in because cuts and breakage offset the geometric subtraction.
Is waterproofing included?
No. Waterproofing and substrate preparation are separate project requirements.