Tile Calculator
Estimate tile quantity based on room size and tile dimensions.
Use decimals when needed. This estimate updates live and is safe to tweak before you buy materials.
Tile Buying Guide
This guide helps you turn your tile calculator result into a cleaner purchase plan. Use it when you want fewer return trips, better waste assumptions, and a more realistic cart.
Step 1: Calculate the grid
Measure the length and width of the surface. If you are doing a complex backsplash, measure the area between cabinets carefully and subtract windows.
Step 2: Prepare for tile breakage
Tiles crack during transit and cutting. Add at least 10% waste for standard layouts, and up to 20% if you are cutting a diagonal pattern.
Step 3: Buy from the same dye lot
When you buy your boxes, ensure they all come from the same production batch (dye lot). This prevents subtle color shifts across your floor or wall.
Recommended for this job
Commonly paired tools and accessories
These are the practical extras people often forget until the last minute, especially when turning a rough estimate into a real purchase list.
Tile leveling systemWhy this helps: Helps keep tile faces even when you are buying for a larger layout.
Tile spacersWhy this helps: Useful for keeping grout lines consistent across the whole run.
Disclosure: these may be affiliate links.
Tile cost planning rule of thumb
A tile budget isn't just the ceramic or porcelain. You need thinset mortar, grout, spacers, a waterproofing membrane (for showers), and sealer.
Understanding the Math
Formula: The basic formula for Tile Calculator typically involves calculating the total area or volume (Length × Width × Depth) and dividing by the coverage of a single unit or package, then adding a waste factor (usually 10%).
Example: For example, if you have a 10x10 area and your material covers 10 square feet per unit, you need 10 units. With a 10% waste factor, you should purchase 11 units to ensure you don't run short.
Related Calculators
Tile Calculator FAQ
What if I do herringbone?
Increase waste to 15-20% for complex patterns.
Does this include grout spacing?
The estimate is close for planning. Final counts should include your layout and grout lines.
What size trowel do I need?
A general rule is to use a 1/4-inch by 1/4-inch square notch trowel for tiles up to 6 inches, and larger trowels for larger tiles.
How long should thinset cure before grouting?
Wait at least 24 to 48 hours for the thinset to fully cure before walking on the tile or applying grout.