Tile Calculator

Estimate ceramic or porcelain tile for floors and walls. Enter total area or L×W, pick a tile size (or custom inches), add waste — get tiles needed, optional box count, and coverage.

Inputs

Surface area

sq ft

Floor or wall area you plan to tile (after openings if you already deducted them).

Tile size

Waste factor

Default 10% for cuts and breakage; use ~15% for diagonal layouts.

Tiles per box (optional)

tiles

From the carton label — leave blank for tile count only.

Results

—tiles

Coverage area —

With waste —

Area per tile —

Exact tiles —

Boxes needed —

Assumptions: Tile area = W × H (inches) ÷ 144. Waste applies to coverage area before dividing by tile size. Tile count is rounded up. Boxes = ceil(tiles ÷ tiles per box) when a box size is entered. Always confirm carton coverage with your supplier.

Tile calculator FAQ

How many tiles do I need for a floor or wall?

Divide surface area (sq ft) by the area of one tile in sq ft, add waste (often 10%), and round up. Tile inches W × H ÷ 144 = sq ft per tile.

What waste factor should I use for tile?

Straight layouts often use about 10%. Diagonal or patterned layouts may need ~15%. Default here is 10%.

How do I convert tile size in inches to square feet?

Width × height in inches ÷ 144. A 12×12 tile is 1 sq ft; a 12×24 is 2 sq ft.

How many tiles are in a box?

Check the carton. Enter tiles per box to see boxes to buy; leave blank for a tile count only.

Embed this calculator on your site (free)

Run a blog, garden center, supply yard or contractor site? Paste this code where you want the tile calculator. It’s free, needs no signup, shows no ads, and sizes itself to fit.

<iframe src="https://qtylab.com/tile/?widget=1" title="Tile calculator by QtyLab" loading="lazy" style="width:100%;max-width:720px;height:1380px;border:0"></iframe>
<p style="font-size:14px;margin:4px 0 16px">Tile calculator by <a href="https://qtylab.com/tile/">QtyLab</a></p>
<script>window.addEventListener("message",function(e){if(e.origin!=="https://qtylab.com"||!e.data||e.data.qtylab!=="h")return;var f=document.getElementsByTagName("iframe");for(var i=0;i<f.length;i++){if(f[i].contentWindow===e.source){f[i].style.height=e.data.h+"px";}}});</script>

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Please keep the “by QtyLab” credit line under it. Questions or a custom setup: admin@qtylab.com.

Step-by-step guide: How many tiles do I need? — formula, worked examples, and common mistakes.