Tile Calculator
Estimate exactly how many floor or wall tiles you need for your project. Enter your area dimensions, tile size, and waste factor below to instantly calculate your tile quantity, boxes, and total cost.
Project Details
Tile Dimensions
Enter your project measurements to see how many tiles you need.
Total Tiles Required
Includes 10% waste allowance.
Boxes to Purchase
0 Boxes
How to Use the Tile Calculator
Whether you are calculating floor tiles for a kitchen renovation, planning a complex shower mosaic, or working out a backsplash calculator for your sink, determining exact quantities is critical. Ordering too few tiles risks mismatched dye lots later, while ordering too many wastes your renovation budget.
Our tool simplifies this process. You can toggle between Imperial (feet/inches) and Metric (meters/centimeters) to match your materials. Simply enter your wall or floor dimensions, input the size of the tiles you are buying, and we will handle the conversion math—including your grout lines and overage.
How the Calculation Works
Tile calculation involves finding the total area of your project space and dividing it by the effective area of a single tile (which includes half of the grout joint around it). Because rooms are measured in feet or meters, and tiles are measured in inches or centimeters, unit conversion is the most common place DIYers make mistakes.
The Floor Tiles Calculation Formula
Number of Tiles = (Total Area) ÷ (Tile Area + Grout Joint)
Once the raw number is found, a waste factor (typically 10%) is multiplied into the total.
Worked Example: 12×24 Tiles in a 10×12 Room
Assume you want to tile a standard bathroom floor that measures 10 feet by 12 feet using large 12×24 inch tiles.
- Find Total Area: 10 ft × 12 ft = 120 square feet.
- Find Tile Area: 12 inches × 24 inches = 288 square inches.
- Convert Tile to Sq Ft: 288 sq in ÷ 144 = 2 square feet per tile.
- Calculate Raw Tiles: 120 sq ft ÷ 2 sq ft = 60 tiles.
- Add Waste Factor (10%): 60 × 1.10 = 66 tiles needed.
Important Tiling Variables
To achieve a professional installation, you cannot rely purely on square footage. The physical reality of laying tile requires accounting for the following structural variables. For comprehensive commercial and residential guidelines, you should reference the standards established by the Tile Council of North America (TCNA).
| Variable | Standard Recommendation | Impact on Calculation |
|---|---|---|
| Standard Waste Factor | 10% Overage | Accounts for room perimeter cuts, accidental breakages during snapping, and future repairs. |
| Diagonal / Pattern Waste | 15% – 20% Overage | Laying tile on a 45-degree angle or using a herringbone pattern generates significantly more off-cut scrap. |
| Grout Joint Width | 1/8″ to 1/4″ (3mm – 6mm) | Large grout joints slightly reduce the total number of tiles needed. Essential to include for mosaic projects. |
Common Tiling Mistakes to Avoid
- Forgetting Dye Lots: Tiles are baked in batches. If you order exactly enough tiles and end up 2 tiles short, the replacement box you buy a week later may be a slightly different shade. Always order 10% extra upfront.
- Not Checking for Square: Never assume room walls are perfectly straight. If you start tiling directly against a crooked wall, your grout lines will look progressively worse as you cross the room. Always snap a center chalk line and use the 3/4/5 rule.
- Ignoring Grout Lines in Small Tiles: If you are using 1×1 inch mosaic tiles, a 1/8 inch grout line represents more than 10% of the surface area. If you don’t calculate the grout, you will vastly overestimate your tile needs.
Frequently Asked Questions
How to calculate tile coverage?
To calculate tile coverage, find the total area of your project (Length × Width) and divide it by the area of a single tile. For example, a 10×10 foot room is 100 square feet. A 12×12 inch tile is 1 square foot. You divide 100 by 1 to get 100 tiles, then add a 10% waste factor for cuts and breakages.
What is the 3/4/5 rule for tiling?
The 3/4/5 rule is a fundamental math principle (based on the Pythagorean theorem) used to ensure your tile layout lines are perfectly square (90 degrees). You measure 3 feet down one line, 4 feet down the intersecting line, and the diagonal distance between those two points should be exactly 5 feet.
How many 12×12 tiles for a 10×10 room?
A 10×10 room equals 100 square feet. Because a 12×12 inch tile equals exactly 1 square foot, you need 100 tiles to cover the floor. Adding a standard 10% waste factor means you should purchase 110 tiles.
What is the formula for calculating tiles?
The basic tile calculation formula is: (Total Project Area) ÷ (Tile Area) = Number of Tiles. Remember to convert all measurements to the same unit (like square feet or square meters) before dividing, and multiply the final number by 1.10 to add a 10% waste margin.
How many 12×24 tiles for 100 sq ft?
A 12×24 inch tile covers 2 square feet (12 × 24 = 288 sq inches; 288 ÷ 144 = 2 sq ft). To cover 100 square feet, divide 100 by 2, which equals 50 tiles. With a 10% waste factor, you should order 55 tiles.
What do tilers charge a day?
Depending on your location and the complexity of the job, professional tilers typically charge between $300 and $600 per day. Many prefer to bid on jobs by the square foot rather than a daily rate, usually charging $5 to $15 per square foot for labor alone.
What is the best tile calculator?
The best tile calculator takes into account your exact tile dimensions, total square footage, the width of your grout lines, and a customizable waste factor. Calculators that omit grout lines will slightly overestimate the number of tiles needed for small-format tiles like mosaics.
What are common tiling mistakes to avoid?
Common mistakes include failing to prepare a flat subfloor, skipping the waterproofing in wet areas, not ordering enough extra tiles (resulting in mismatched dye lots later), and starting a layout off a crooked wall without snapping a perfectly square chalk line.
How many tiles is 100 sq ft?
The number of tiles in 100 square feet depends entirely on the tile size. It requires 100 tiles if they are 12×12 inches (1 sq ft each), 50 tiles if they are 12×24 inches (2 sq ft each), or 400 tiles if they are 6×6 inches (0.25 sq ft each).
What does a tile guy charge per hour?
When billed hourly, independent tile contractors typically charge between $40 and $80 per hour. Specialized or union tilers in high-cost-of-living areas may charge $100 to $120 per hour. However, most tilers prefer flat-rate square footage pricing.
How many tiles can a tiler lay in a day?
An experienced tiler can typically lay between 100 and 150 square feet of standard floor tile per day. This number drops significantly for small subway tiles, intricate patterns like herringbone, complex cuts around plumbing, or wall installations.
Disclaimer: This calculator provides planning estimates. Verify critical quantities, structural requirements, local codes, and manufacturer specifications before purchasing materials or beginning construction.
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