Tile Calculator
Calculate how many tiles you need for floors, walls, and backsplashes
How to Use This Tile Calculator
- Enter the area dimensions (length and width) to be tiled
- Input your tile dimensions (common sizes shown in reference)
- Specify the grout gap width (1/8 inch is standard)
- Set waste factor based on layout complexity (10% standard, 15-20% for diagonal)
- Optionally enter price per tile or per sq ft for cost estimates
- Click Calculate to see tiles needed and material costs
Example: A 10×12 foot bathroom floor (120 sq ft) with 12×12 inch tiles: 120 tiles exact, plus 10% waste = 132 tiles needed. At $2.50/tile, budget $330 for tiles alone.
Tip: Always buy all tiles from the same lot number - colors can vary between production runs. Order extra for future repairs.
Why Use a Tile Calculator?
Accurate tile estimation prevents project delays from running short and saves money by not over-ordering expensive materials.
- Calculate floor tiles for bathrooms, kitchens, and entryways
- Estimate wall tiles for showers, backsplashes, and accent walls
- Plan material purchases for multiple rooms or areas
- Compare costs between different tile sizes and materials
- Verify contractor material estimates before project start
- Calculate specialty tiles needed for borders and accents
Understanding Your Results
Results show tiles needed with waste included, plus optional cost calculations.
| Result | Meaning | Action |
|---|---|---|
| 10% waste factor | Simple rectangular layout | Standard for grid patterns in square/rectangular rooms |
| 15% waste factor | Moderate complexity | Use for rooms with alcoves, brick patterns, or some cuts |
| 20% waste factor | Complex layout | Diagonal patterns, herringbone, or many obstacles |
| 25%+ waste factor | Very complex | Intricate patterns, many cuts, or fragile materials |
Meaning: Simple rectangular layout
Action: Standard for grid patterns in square/rectangular rooms
Meaning: Moderate complexity
Action: Use for rooms with alcoves, brick patterns, or some cuts
Meaning: Complex layout
Action: Diagonal patterns, herringbone, or many obstacles
Meaning: Very complex
Action: Intricate patterns, many cuts, or fragile materials
Note: Tiles are sold by the box (typically covering 10-15 sq ft). Round up to whole boxes. Stores may charge restocking fees for returns, so calculate carefully.
About Tile Calculator
Formula
Tiles = (Area ÷ Tile Size) × (1 + Waste Factor) Account for grout by adding gap width to tile dimensions when calculating coverage. A 12×12 tile with 1/8 inch gaps covers about 12.125×12.125 inch cells, reducing the count slightly.
Current Standards: Industry standards recommend minimum 1/16 inch grout joints for rectified (precision-cut) tiles and 1/8 to 3/16 inch for standard tiles. Larger format tiles (24+ inches) may need larger joints to accommodate floor irregularities.
Frequently Asked Questions
How do I account for toilets, vanities, and other fixtures?
Include the full floor area in your calculation - the waste factor covers the cuts around fixtures. For precise estimates, subtract fixture areas but increase waste factor. Cutting around toilets creates partial tile waste that roughly equals what you'd use if tiling under them.
Do I need different calculations for wall tiles?
Same calculation, but measure each wall section separately and add them. Subtract windows and doors. Wall layouts often center on focal points, creating cut tiles at both ends - factor this into waste. Ceiling height changes add cuts.
How do I estimate grout quantity?
Grout coverage depends on tile size, thickness, and gap width. A 25-pound bag of sanded grout covers roughly 100-200 sq ft for 12×12 tiles with 1/8 inch joints. Larger gaps and smaller tiles use more grout. Unsanded grout for gaps under 1/8 inch.
What's the best tile size for small bathrooms?
Medium tiles (12×12 or 12×24) often work well - large enough to minimize grout lines but not oversized for the space. Very large tiles can make small rooms feel cramped. Subway tiles (3×6) remain popular for walls. The key is proportion.
Should I buy more tiles than calculated?
Yes - 10% waste is minimum. Store owners often recommend 15% for first-time DIYers. Most importantly, buy extra from the same dye lot for future repairs. Matching tile later is nearly impossible; colors shift between production runs. One extra box can save a future headache.