How to use Tile Calculator
The tile calculator estimates the number of tiles needed for floors, walls and backsplashes based on area dimensions, tile size and grout joint width. It accounts for waste from cuts on edges and recommends a percentage overage to ensure you can replace cracked or damaged tiles from the same batch.
- Enter the area dimensions (length × width or total sq ft).
- Enter tile dimensions (width × height) and grout joint width.
- Set the layout pattern (straight, diagonal or offset).
- Review tile count, waste factor and bags of grout and adhesive.
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Tile size selection and layout patterns
Large-format tiles (12×24", 24×48") make rooms look bigger and have fewer grout lines, reducing maintenance. Small tiles (1×1" mosaic, 2×4" subway) allow curved surfaces and create visual interest. Diagonal layouts look dramatic but require 15% more tile due to additional cuts. Offset (brick) patterns use ~10% more. Straight lay is most material-efficient at ~10% waste.
| Layout pattern | Waste factor | Notes |
|---|---|---|
| Straight / grid | 10% | Most efficient; minimal cut waste |
| Offset / brick | 10–12% | Staggered joints; slightly more cuts |
| Diagonal / 45° | 15% | Significant corner cuts |
| Herringbone | 15–20% | Complex cuts; allow generous overage |
Grout and adhesive quantities
Grout quantity depends on tile size, joint width and joint depth. Narrow joints (1/16") need less grout than wide joints (1/4"). Standard coverage: 25 lbs of unsanded grout covers ~100–200 sq ft at 1/8" joint. Tile adhesive (thinset) coverage: 50 lbs covers 40–50 sq ft for floor tile. Always buy one extra bag of each — running short mid-project can mean colour mismatches if a different batch is used.
Worked examples
10×10 ft floor, 12×12 in tiles
Inputs: 100 sq ft ÷ 1 sq ft × 1.10
Result: ≈ 110 tiles (10% waste)
Same floor, 12×24 in tiles
Inputs: 100 sq ft ÷ 2 sq ft × 1.10
Result: ≈ 55 tiles
Diagonal layout, 12×12 in tiles
Inputs: 100 ÷ 1 × 1.15 (diagonal waste)
Result: ≈ 115 tiles
Glossary
- Thinset
- Cement-based tile adhesive mortar applied to the substrate before laying tile.
- Grout
- Material filling joints between tiles; sanded for joints > 1/8", unsanded for smaller joints.
- Substrate
- The surface tiles are laid on: cement board, plywood, or concrete.
- Lippage
- Height difference between adjacent tiles; caused by uneven substrate or inconsistent adhesive.
Related reading
Frequently Asked Questions
Why use Tile Calculator?
- Calculates tile count for floors, walls and backsplashes with grout joint offsets included
- Automatically adjusts waste percentage for straight, offset and diagonal layout patterns
- Estimates thinset adhesive and grout bag counts alongside the tile count
- Same-batch overage recommendation protects against dye-lot mismatches on future repairs
Common use cases
- Work out how many 12×24 tiles are needed for a master bathroom floor with 10% waste
- Estimate subway tile quantity and grout bags for a full kitchen backsplash
- Calculate tile count for a diagonal-pattern entryway before placing a special order
- Build a complete materials list — tiles, thinset and grout — for a shower surround
- Verify a tile contractor's material estimate against your own room measurements
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