Tile Calculator Room Area
Estimate tiles and boxes needed for floors and walls using tile size, grout spacing, layout wastage, and simple real-world assumptions.
How to calculate floor or wall tile area
Start by calculating the total area you want to cover. For floors, multiply room length by room width. For walls, multiply wall width by wall height and then multiply by the number of walls. If you subtract doors and windows, make sure the openings area does not exceed the total wall area.
How tile size affects tile count
Tile count depends on tile area. Larger tiles cover more area per piece, reducing the number of tiles required. If you add grout spacing, the effective tile footprint increases slightly.
Why wastage matters when buying tiles
Wastage accounts for cuts at edges, breakage during handling, and pattern-specific offcuts. Straight layouts often use 5%–10% wastage, while diagonal and herringbone patterns typically need more.
Frequently Asked Questions
Quick answers about tile quantity calculations.
How many tiles do I need for my room?
Calculate the total room area and divide by tile area. Then add wastage and round up to whole tiles.
How do I calculate tile area?
Tile area = tile length × tile width. If grout spacing is used, effective tile size becomes (tile + gap) in both directions.
How much extra tile should I buy for wastage?
Straight layouts often use 5%–10%. Diagonal and herringbone patterns typically need 10%–18% depending on the room shape and installer.
How many tiles are in a box?
It varies by tile size and manufacturer. If you enter tiles per box, this tool estimates boxes required and area per box.
Does grout spacing affect tile quantity?
Yes. Grout spacing slightly increases the effective tile footprint, which can reduce tile count a little for large areas.
Disclaimer
This calculator provides an estimate only. Real projects vary based on tile cuts, patterns, installer method, and site conditions. Always verify with your tile supplier and installer.