Quick answer
Buy 10-15% extra tile for most straight layouts and 15-20% extra for diagonal patterns, complex rooms, showers, or projects with many cuts.
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Straight layout
Add 10-15% extra tile for cuts, breakage, and future repairs.
Diagonal or complex layout
Add 15-20% because angled cuts and pattern matching create more waste.
Repair planning
Keep spare tile from the same lot because colors and patterns can change later.
Common questions
Is 10% tile waste enough?
Usually yes for simple rectangular rooms with a straight layout.
Should shower tile use more waste?
Yes. Showers often need 15-20% because of niches, corners, and plumbing cuts.