Tile Calculator
Calculate how many tiles and boxes you need for any floor or wall, with grout gap and waste allowance built in.
This free tile calculator estimates the number of tiles needed for any room based on the floor or wall area and your tile size, including grout gaps and a waste allowance for cuts and breakage. Enter your room dimensions, tile dimensions, and get the total tiles and boxes needed instantly.
How to Calculate Tiles Needed
Multiply the room length by the width to get the area in square feet. Divide by the area of one tile (converted from inches to feet, including the grout gap). Round up and add a waste allowance of 10 percent for standard layouts or 15 percent for diagonal patterns. This calculator handles all of that automatically.
Frequently Asked Questions
How many 12×12 tiles do I need for a 10 by 15 foot room?
The room is 150 square feet. With 12×12 tiles and 10 percent waste, you need about 165 tiles. Enter the dimensions to get the exact count including grout gaps and boxes.
Should I add 10 or 15 percent extra for waste?
Use 10 percent for a standard grid layout. Use 15 percent for diagonal, herringbone, or complex patterns that produce more cuts.
Does the grout gap affect the tile count?
Yes, slightly. Wider gaps mean each tile covers more area, so you need fewer. The calculator includes the gap in the math.
Can I share the estimate with my contractor?
Yes. Click Share for WhatsApp or email, or Download PDF with the full breakdown to bring to the tile store.
How much extra tile should I order?
Add 10 percent for a standard grid layout, or 15 percent for diagonal, herringbone, or complex patterns that produce more cut pieces. Always round up to whole boxes.
Does the grout gap affect how many tiles I need?
Yes. Wider grout gaps slightly reduce the number of tiles because each tile effectively covers more floor. This calculator includes the gap in the calculation.