A walkthrough, end to end.
- 1
Enter the room dimensions and the tile size.
- 2
Add a waste % (commonly 10%) and tiles per box.
- 3
See total area, tiles needed, and boxes required.
Tile count
tilesNeeded = ceil( roomArea × (1 + waste) / tileArea ). boxes = ceil( tiles / perBox ).
What you can do with this.
Bathroom retile
Plan small-format wall tiles with a 10% waste allowance.
Kitchen backsplash
Compute tiles for a narrow strip behind the counter.
Hallway and entry
Larger-format floor tiles with cuts at the edges.
Outdoor patio
Account for higher waste % in irregular layouts.
Diagonal layouts
Diagonal tiling needs more waste — bump waste % up.
Pattern matching
Patterned tiles often need 15–20% extra.
Replacement tiles
Buy a small extra box for future repairs.
Tile 2026 — what's current
Standard estimating; calculator wins for instant box count.
Frequently asked.
10% for straight layouts, 15–20% for diagonal or patterned tiles.
No. All math runs in your browser.
Compute each region separately and add the box counts.
Not included — see the manufacturer's coverage chart.