Tile & Flooring Calculator

Calculates how many tiles, planks or boxes you need for a floor or wall from its area, the tile size, the grout joint and an allowance for waste. It works for laminate and vinyl planks as well as tile.

How to use

1. Choose "Floor" or "Wall" under "Surface" and enter the shape and size of each area. On a wall, add "Window or door (subtract)" for parts that are not tiled.
2. Enter "Tile width", "Tile length" and "Grout joint". Leave the grout empty or 0 for planks and click flooring.
3. Choose a "Layout": straight (10% extra), diagonal or herringbone (15% extra), or "Custom extra".
4. Under "Box contents", enter the pieces or the area per box to see "Boxes to buy". Add a "Price" for an "Estimated cost".

How it works

• One tile covers (width + grout) × (length + grout). Tiles needed = area with extra ÷ the area of one tile, rounded up.
• The "Price" can be given per tile or plank, per box, or per area: per square foot with imperial units and per square meter with metric units.
• The extra covers cuts at the edges, breakage and pattern matching. The page suggests keeping a few spare tiles from the same batch for repairs.

Questions and answers

How many 12x12 tiles do I need for 120 square feet?

With a 1/8 in grout joint and 10% extra: 132 ÷ (12.125 in × 12.125 in ÷ 144) = 129.3, so 130 tiles.

How much extra tile should I buy?

The tool uses 10% for a straight layout and 15% for diagonal and herringbone. For a room with many corners or large tiles, set a higher "Custom extra".

How many boxes of flooring do I need?

Divide the area including extra by the coverage per box and round up. Choose "Area per box" under "Box contents" and enter the figure printed on the box.

Does the grout joint change the tile count?

Slightly. Each tile covers its own size plus one joint on two sides, so wider joints need a few fewer tiles.