How to estimate tile for a floor or wall
Measure area, add a sensible waste factor, then round up to whole boxes.
Tile estimates are mostly math, but the two places people miss are waste and coverage per box. Even a simple room needs cuts, and different tile sizes cover different areas per box.
This guide shows a fast, reliable approach that works for floors, showers, and backsplashes.
Step-by-step: tile math
- Measure the tiled area (length × width for floors, or sum wall rectangles).
- Subtract large openings only if they are truly untiled (e.g., a big window).
- Choose a waste factor (often 10% for straight-lay, 15%+ for diagonal/complex layouts).
- Convert total tile area to boxes using the product coverage per box.
- Round up to whole boxes and consider extra for future repairs or dye-lot matching.
Practical tips
- Small tiles and mosaics increase cut count; waste often goes up.
- Patterned layouts (herringbone, diagonal) usually require more overage.
- Don’t forget trim pieces, bullnose, and transitions if your design needs them.
- Buy extra from the same batch to avoid color/size variation later.
Want a quick box count?
Use our tile calculator and share a link that keeps your inputs.
FAQ
How much waste should I add for tile?
10% is common for straightforward installs. Use 15% or more for diagonal patterns, lots of corners, or small rooms.
Should I subtract cabinets or vanities?
If they will permanently cover the area and you won’t tile underneath, subtract them. If you’re unsure, leave them in and rely on waste/overage.
Why do I need to round up to whole boxes?
Tile is sold by the box, and breakage or future repairs are much easier if you have spare pieces from the same batch.
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