OptiDrop

Tile Calculator — Estimate Floor Tiles Needed

Calculate exactly how many floor tiles you need for any room. Enter room dimensions, tile size, and gap width. Get tiles needed, tiles with 10% waste buffer, and total area covered.

Free Tile Calculator Online — Estimate Floor Tiles Needed

OptiDrop's Tile Calculator helps you estimate exactly how many floor tiles you need for any room. Enter the room dimensions, tile size, and the gap (grout joint) width between tiles. The calculator computes the exact number of tiles needed and adds a 10% waste buffer for cuts and breakage.

How Does the Tile Calculator Work?

The calculator first determines the effective tile size by adding the gap width to both the tile length and tile width. It then divides the room area (length times width) by the effective tile area to get the exact number of tiles. A 10% buffer is added on top for waste from cuts, breakage, and future repairs.

Why Include a Waste Buffer?

Professional tilers always recommend buying 10-15% more tiles than the exact calculation. This accounts for tiles that need to be cut to fit edges and corners, potential breakage during installation, and having a few extra tiles on hand for future repairs. The calculator uses 10% as a standard buffer.

Frequently Asked Questions

Enter your room length and width, tile length and width, and the gap size between tiles. The calculator divides the room area by the effective tile area (including gaps) to determine how many tiles you need. It also adds a 10% waste buffer for cuts and breakage.
A 10% waste buffer accounts for tiles that need to be cut to fit edges and corners, as well as potential breakage during installation. It is recommended to always buy 10-15% more tiles than the exact calculation to avoid running short mid-project.
The gap (or grout joint) is the space between tiles filled with grout. Common gap sizes range from 1/16 inch (1.5mm) for rectified tiles to 1/8 inch (3mm) for standard tiles. The calculator adds this gap to each tile dimension for accurate coverage calculation.
Yes, this calculator works for both floor and wall tiles. Simply enter the wall dimensions as the room dimensions. The calculation is the same regardless of whether you are tiling a floor, wall, or backsplash.

Last updated: June 2026