Tile Quantity Estimator
Use this quick calculator to estimate the number of floor or wall tiles you need, including grout spacing and waste.
Why a tile calculator matters
Buying tile sounds simple until you realize that small measuring mistakes can turn into expensive store runs. A good tile estimate helps you budget correctly, avoid delays, and reduce leftover material. Whether you are planning a bathroom remodel, kitchen backsplash, shower wall, or full floor replacement, this calculator gives you a practical starting point in minutes.
The biggest advantage is confidence. Instead of guessing based on total square footage alone, you can include tile size, grout spacing, and waste percentage to get a more realistic purchase number.
How this calculator works
1) Measure your total surface area
Enter the length and width of the area you want to tile. You can use feet or meters. For irregular spaces, split the room into rectangles, calculate each section, and add the results before entering your totals.
2) Enter tile dimensions
Input your tile length and width, then select the tile unit. Many people measure rooms in feet and tiles in inches, and this tool handles that conversion automatically.
3) Add grout width and waste allowance
Grout joints slightly increase the effective spacing between tiles. Waste allowance covers breakage, cuts around corners, pattern matching, and future repairs. The calculator applies your waste percentage after estimating base tile quantity.
Recommended waste percentages
- 5% to 8% for straight layouts in simple square rooms.
- 10% for most common residential tile projects.
- 12% to 15% for diagonal or staggered patterns.
- 15% to 20% for complex rooms, many fixtures, or large format tile with difficult cuts.
Example calculation
Imagine a room that is 12 ft × 10 ft using 12 in × 12 in tiles, with 1/8 in grout and 10% waste. The calculator converts units, estimates the grid coverage, then adds waste. You get a recommended tile quantity to purchase, and if you enter tiles per box, it also tells you how many boxes to buy.
Common mistakes to avoid
- Forgetting to subtract non-tiled areas (like islands or fixed cabinets).
- Using nominal tile size instead of actual size listed by the manufacturer.
- Skipping waste percentage because the room looks simple.
- Not buying from the same dye lot or batch.
- Ignoring future repairs—keeping spare tiles can save major effort later.
Quick planning tips before you buy
Check tile packaging coverage
Some brands list box coverage in square feet or square meters, while others list only tile count. Use whichever method matches your supplier, but always round up to full boxes.
Plan your layout direction
A straight lay usually wastes less tile than diagonal designs. If visual impact matters more than efficiency, increase waste to protect your budget.
Order extras now, not later
Discontinued tile lines and color variations can make matching old stock difficult. Ordering a little extra upfront is usually cheaper than sourcing replacements months later.
Frequently asked questions
Does this work for wall tiles too?
Yes. The same length × width approach works for walls, backsplashes, and shower surrounds. Just measure each section and combine totals.
Can I use mixed tile sizes?
This calculator assumes one tile size. For mixed patterns, calculate each tile type separately based on its share of the layout.
What if my room is not perfectly rectangular?
Break the room into smaller rectangles, calculate each area, and sum them. For curved boundaries, add extra waste to stay safe.
Is area-based estimation enough?
Area-only estimates can undercount when many edge cuts are needed. This tool combines area and grid logic, then adds waste, giving a more practical purchase recommendation.