Tile & Flooring Quantity
How many tiles or planks an area needs from the tile size and grout joint, with your waste allowance, boxes by count or coverage, and the spare after rounding.
A tile or plank count and box order for a floor or wall — with the joint accounted for, the rounding visible, and the cost at your price per box.
Example: 20 m² of 300 × 300 mm tiles with a 3 mm joint takes 218 tiles; with 10 % waste, 240 — 24 boxes of 10.
One tile, one joint,
then round up.
How the count is formed, why the joint matters, and what the count leaves to you.
The cell and the count
Laid in a grid, each tile occupies its own size plus one grout joint along each axis (joints are shared between neighbours, so one joint width per tile, not two). Tiles needed = area ÷ ((length + joint) × (width + joint)), rounded up to a whole tile. A 300 × 300 mm tile with a 3 mm joint occupies 303 × 303 mm, so 20 m² takes 218 tiles, not 223. Planks and sheets with no joint use their own size.
Waste, boxes, and the spare
The waste allowance is yours to set — edge cuts, diagonal or offset patterns, and breakage differ by job, so no figure is assumed. Boxes are rounded up from the tile count when tiles are sold by the piece, or from the area (with waste) when boxes are sold by coverage; the spare tiles or area after rounding are shown so the order is not a mystery.
What the count does not decide
This is a count, not a layout: where cuts fall, whether offcuts can be reused, border tiles, trims, adhesive, and grout quantities are outside it. Get the area from your measurements (the Square Footage & Area utility handles irregular rooms). Prices are whatever you enter. Inputs stay in your browser; the same four anonymous usage counts as the rest of the site apply.