How many tiles do I need?
Enter the tiled area in square feet and the tile dimensions in inches. A 120 sq ft floor with 12 x 12 in tile and 10% waste needs 132 tiles.
Tile size changes the count
A 12 x 12 tile covers about 1 sq ft, a 12 x 24 tile covers about 2 sq ft, and a 3 x 6 subway tile covers about 0.125 sq ft. Use actual tile dimensions for the count.
Waste depends on layout
Straight layouts often use less waste than diagonal, herringbone, patterned, shower niche, or backsplash outlet-heavy layouts. Keep trim and accent pieces separate.
Tile count is not the full material list
This page estimates tile quantity. Thinset, grout, trim, waterproofing, spacers, backer board, and transitions should be planned separately.
Tile size coverage reference
Tile coverage is length x width divided by 144. Actual coverage can vary slightly by product and grout joint.
| Tile size | Sq ft per tile | Tiles for 100 sq ft before waste |
|---|---|---|
| 3 in x 6 in subway | 0.125 sq ft | 800 tiles |
| 4 in x 4 in | 0.111 sq ft | 900 tiles |
| 6 in x 6 in | 0.25 sq ft | 400 tiles |
| 12 in x 12 in | 1.00 sq ft | 100 tiles |
| 12 in x 24 in | 2.00 sq ft | 50 tiles |
| 24 in x 24 in | 4.00 sq ft | 25 tiles |
Tile setting material coverage checks
Use the actual product label for final ordering. These are the inputs that most often change coverage.
| Material | Main coverage driver | Common reason to estimate separately |
|---|---|---|
| Grout | Tile size, joint width, tile thickness | Mosaics and wide joints use more grout. |
| Thinset / mortar | Trowel notch, substrate, tile format | Large-format tile and uneven substrate use more mortar. |
| Adhesive / glue | Product type and surface | Walls, floors, and wet areas may require different products. |
| Backsplash tile | Outlets, ends, trim, small cuts | Small areas can still have high cut waste. |
Before you calculate
- Measure the tiled surface area, then use the actual tile length and width when tile count is needed.
- Calculate separate walls, floors, niches, or borders when tile sizes differ.
- Increase waste for diagonal layouts, small cuts, patterned tile, or fragile material.
Common mistakes
- Using nominal tile size without checking actual coverage.
- Forgetting cuts around drains, corners, fixtures, and edges.
- Combining field tile, trim, bullnose, and accent tile into one estimate.
Formula
units = ceil((area * (1 + wastePercent / 100)) / coveragePerUnit)
Assumptions
- Use the product coverage from the label or installation sheet.
- Waste covers cuts, layout changes, mixing loss, seams, and damaged pieces.
- This estimates quantity only; substrate prep, layout, compatibility, and labor are separate.
Example
Estimated tile sealer needed (bottles): 1 bottles
How to calculate tile sealer bottles
- Measure the project area in square feet.
- Enter the coverage per bottles from the product label or supplier data.
- Add waste for cuts, overlaps, damaged pieces, or layout changes.
- Divide adjusted area by coverage per bottles and round up to a whole purchasable unit.
- Check accessories, trim, fasteners, seams, or prep materials separately.
Before you buy materials
- Round up to full boxes and check dye lot or batch consistency.
- Keep extra tile for future repairs when the product may be discontinued.
FAQ
What is the example tile sealer bottles result?
Use the measured project inputs, product coverage, and waste, then calculate the planning result. In the default example, the result is 1 bottles.
How do I calculate how many tiles I need?
Divide project area by tile coverage, then add waste. Tile coverage in square feet is tile length x tile width divided by 144 when dimensions are in inches.
How many 12 x 12 tiles for 120 sq ft?
A 12 x 12 tile covers about 1 sq ft. For 120 sq ft with 10% waste, plan about 132 tiles.
How much waste should I add for tile?
A common planning buffer is 10% for simple layouts and more for diagonal patterns, small cuts, fragile tile, showers, niches, or backsplashes with many outlets.
Does this include grout and thinset?
No. Tile count, grout, and thinset should be estimated separately because their coverage depends on different inputs.
Related calculators
This calculator is for planning estimates only. Verify final quantities with product labels, project conditions, and a qualified professional when accuracy matters.