DIY CalculatorFor diagonal or herringbone layouts, raise the waste to 15–20% — those patterns need many more cuts.
Good to know
- Straight layout: add 10%.
- Diagonal, herringbone or large tiles: add 15–20%.
- Keep a few spare tiles: dye lots change between batches.
- Check how many tiles (or square feet) are in a box before ordering.
Tiles needed by area (no extra added)
| Area | 12 × 12 in | 12 × 24 in | 18 × 18 in | 6 × 24 in plank |
|---|---|---|---|---|
| 25 sq ft | 25 | 13 | 11 | 25 |
| 50 sq ft | 49 | 25 | 22 | 49 |
| 100 sq ft | 98 | 50 | 44 | 98 |
| 250 sq ft | 245 | 124 | 109 | 244 |
| 500 sq ft | 490 | 247 | 218 | 488 |
How to use this calculator
- Measure the length and width (or the diameter of a round area). Use any unit — feet, inches, yards or meters.
- Split odd shapes into rectangles, circles and triangles, and add each one with “Add another area”.
- Pick a size and the joint width; the extra percentage covers cuts and breakage.
- Optionally enter a price to estimate the cost.
Add this calculator to your website
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Frequently asked questions
How many 12×12 tiles do I need for 100 square feet?
100 tiles without grout joints, or 110 with 10% extra. Grout joints make each tile cover slightly more, so the exact count is a little lower.
How much extra tile should I buy?
About 10% for a simple straight layout, and 15–20% for diagonal, herringbone or rooms with many corners.