Floors & Walls
Tile Calculator
Estimate tiles and boxes for a room from area, tile size and waste allowance.
Enter your measurements
Results update as you type.
About this calculator
An area-based procurement estimate: enter the room area (or dimensions, minus exclusions), the tile size and a waste allowance, and get the number of tiles and boxes to buy. This is not a cut-layout optimizer — it tells you how much to purchase, not where each cut goes.
How to use this calculator
- Measure the room and subtract areas that will not be tiled.
- Enter the actual tile face size.
- Choose a waste allowance — diagonal patterns and many cuts need more.
- Enter tiles per box from the product packaging to get a box count.
Formula
Net area = room area − exclusions
Tile equivalents = net area × (1 + waste ÷ 100) ÷ tile area
Tiles to buy = ⌈tile equivalents⌉; boxes = ⌈tiles ÷ tiles per box⌉
Assumptions
- Grout gaps are not subtracted — a deliberately conservative choice, so small gap savings are already inside your waste allowance.
- Tile area uses the actual face dimensions you enter.
- Waste is applied once to the area before counting tiles.
Common mistakes
- Counting excluded or overlapping areas twice.
- Using nominal dimensions where actual installed dimensions or usable coverage are needed.
- Treating whole purchase quantities as an optimized cutting or installation plan.
Worked example
Try it: press “Load example” above the form.
10 m² with 0.5 m tiles and 10% waste is 44 tile equivalents; at 8 per box, buy 6 boxes.
Limitations
Not an exact cut or layout optimizer, and no arbitrary herringbone waste guarantee. Complex layouts deserve a drawn plan.
Frequently asked questions
Should I measure tile size or box coverage?
Use the actual tile face size for a piece count and the stated pieces per box for purchasing. Joints, cutting layout and waste can affect the order.
Why does the tool round up?
The result separates area, equivalent pieces and whole tiles or boxes. A partial tile or box is rounded up at the purchasing step, after the chosen allowance.
What does the worked example show?
10 m² with 0.5 m tiles and 10% waste is 44 tile equivalents; at 8 per box, buy 6 boxes.
Which assumptions should I check before using the result?
Not an exact cut or layout optimizer, and no arbitrary herringbone waste guarantee. Complex layouts deserve a drawn plan.
Sources
Sources explain the methods and any named product presets. Check your product label where coverage, yield or density differs.
Calculation documentation · Updated 2026-11-08 · Version 1.6.4. Estimates are planning aids. Confirm quantities, coverage and prices with your supplier before purchasing. Found an error? Report it.
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