Measure the length and width of your floor or wall area. Multiply them to get the total area. Then divide the total area by the area of a single tile (including grout gap if applicable). This gives you the theoretical number of tiles. Always add a waste factor of 5-15% to account for cuts, breakage, and future repairs. Our calculator uses the row-column method for greater accuracy — it calculates how many tiles fit along each dimension and rounds up, which is more realistic than pure area division.

The waste factor accounts for tiles that are cut to fit edges, corners, and obstacles, as well as tiles that may break during installation or shipping. It also provides a few spare tiles for future repairs. Typical recommendations: 5-10% for simple rectangular floors with large tiles; 10-15% for walls, diagonal patterns, or small tiles; up to 20% for intricate patterns like herringbone. Our calculator defaults to 10%, which is suitable for most projects.

For larger tiles (12″×12″ or 30cm×30cm and above), grout width has a minimal impact on the total count — typically less than 1-2% difference. However, for small mosaic tiles (like 2″×2″ or 5cm×5cm), grout lines can account for a noticeable portion of the total area. Our calculator includes grout width in its computations so you get precise results regardless of tile size. Standard grout widths range from 1/16″ (1.5mm) for rectified tiles to 1/4″ (6mm) for rustic tiles.

The basic math is identical, but wall installations typically require a higher waste factor (10-15% vs. 5-10% for floors) because walls have more edges, cutouts for outlets, windows, and fixtures. Wall tiles also tend to be smaller and more prone to breakage during cutting. Additionally, wall areas may include separate sections (like a shower surround) that require precise layout planning. Select the appropriate scene in our tool to get tailored waste factor recommendations.

Break the area into smaller rectangles or squares. Measure each section separately, calculate the tile count for each, and sum them up. For triangular or curved areas, approximate them as rectangles with slightly larger dimensions, then add an extra 5% waste. For L-shaped rooms, treat them as two rectangles. Our calculator works best with rectangular areas; for complex shapes, run multiple calculations and add the results together.

Use whichever system matches your measurements. Imperial (feet and inches) is standard in the US, UK, and Canada for construction. Metric (meters and centimeters) is used in most other countries. Our calculator handles both seamlessly — simply toggle the unit switch. All conversions are handled automatically. Tip: when using imperial, enter room dimensions in feet (e.g., 12.5 ft) and tile sizes in inches (e.g., 12″).

It's wise to keep 5-10 extra tiles (or at least one full box) stored in a safe place after your project. Tiles from different production batches can vary slightly in color and shade (known as dye lot variation). If you need to replace a damaged tile years later, having matching spares from the original batch is invaluable. Our calculator's waste factor includes a margin for this, and the "Boxes to Buy" feature helps you round up to full boxes.

Floors: 12″×12″, 12″×24″, 18″×18″, 24″×24″, and large format 24″×48″ are popular. Large tiles make rooms feel bigger and have fewer grout lines. Walls: 4″×4″, 6″×6″, 4″×12″ subway tiles, 12″×24″, and mosaic sheets (typically 12″×12″ mesh-backed) are common. Metric equivalents: 30×30cm, 30×60cm, 45×45cm, 60×60cm for floors; 10×10cm, 10×30cm, 30×60cm for walls. Our preset buttons let you quickly select these standard sizes.

Our calculator provides estimates for standard straight-lay patterns. Diagonal (45°) patterns typically require 10-15% more tiles due to increased cutting at edges. Herringbone and chevron patterns can require 15-25% more tiles. To adapt: calculate with our tool using a standard layout, then manually increase the waste factor to the appropriate level for your pattern. The "Waste Factor" slider can be adjusted up to 30% to accommodate complex layouts.

The row-column method calculates how many full tiles fit along the length and width of your space, rounding up partial tiles for each row and column. Simple area division divides total area by tile area. The difference becomes significant when your room dimensions aren't exact multiples of the tile size. For example, a 10.3ft × 10.3ft room with 12″ tiles: area division gives ~106 tiles, but the row-column method gives 11×11=121 tiles because each row needs 11 tiles to cover 10.3ft. The row-column method is more realistic for actual installation.