Tile Calculator
Calculate the number of tiles, boxes required, and total cost based on area, tile size, gap, and waste factor
Tile Calculator — How Many Tiles Do I Need?
Divide total room area by the area of one tile to get the base tile count. Add 10% waste for straight-lay patterns and 15% for diagonal and herringbone patterns. Use the tile calculator above to get exact tile count, box quantity, grout, and total cost instantly.
Never order the exact tile count for your room area — you will always run short. Cuts at walls, broken tiles, and future repairs require extra tiles from the same production lot. Production lots change color between runs. |
How to Use the Tile Calculator
To get your tile estimate, enter 5 values: room length, room width, tile length, tile width, and layout pattern. The calculator returns tile count, boxes to buy, grout quantity, and total material cost.
- Measure room length and width — measure at the longest and widest points in feet and inches
- Enter tile dimensions — use the tile size printed on the box, not the grout-joint measurement
- Select layout pattern — waste factor changes by pattern type (see table below)
- Enter grout joint width — standard is 1/16″ for rectified tile, 3/16″ for standard tile
- Enter cost per box — the calculator returns total material cost with waste adjustment
Subtract fixed areas — vanity base, kitchen island, bathtub pan — only if tile does not run underneath them. For open-plan rooms, calculate the connected area as one room.
Tile Calculation Formula
Tiles needed = Room Area (sq ft) / Tile Area (sq ft) x Waste Factor — this formula works for any tile size in any room.
Worked Example 1 — 12×12 Tile in a Bathroom
Room: 10 ft x 8 ft = 80 sq ft. Tile: 12″ x 12″ = 1 sq ft per tile.
- Base count: 80 / 1 = 80 tiles
- With 10% waste: 80 x 1.10 = 88 tiles to order
- Boxes (10 tiles/box): 88 / 10 = 9 boxes (round up)
Worked Example 2 — 24×24 Large Format Tile
Room: 15 ft x 12 ft = 180 sq ft. Tile: 24″ x 24″ = 4 sq ft per tile.
- Base count: 180 / 4 = 45 tiles
- With 12% waste (large format): 45 x 1.12 = 51 tiles to order
- Boxes (3 tiles/box): 51 / 3 = 17 boxes
Tile Waste Factor by Layout Pattern
Waste factor is the most skipped step in tile estimates. Pattern, tile size, and room shape all affect how much material is cut and discarded at walls and corners.
Layout Pattern | Waste Factor | Extra Cost Impact | Notes |
Straight lay (grid) | 10% | Low | Lowest waste — cuts only at perimeter walls |
Running bond (brick) | 12% | Low-Medium | Offset joints at walls increase cuts by 20% |
Diagonal (45 degrees) | 15% | Medium | All 4 wall edges need angle cuts |
Herringbone | 20-25% | High | 45 degree cuts at every row end — maximum waste |
Chevron | 20-25% | High | Similar to herringbone — mirror-cut boards |
Basketweave | 12-15% | Medium | Multiple small cuts at pattern intersections |
Large format 24×24 | 12-15% | Medium-High | More material lost per cut on large tiles |
How Many Tiles Do I Need per Square Foot?
Tile Size | Tiles per Sq Ft | Sq Ft per Tile | Grout Joint (standard) |
2″ x 2″ (mosaic) | 36 tiles/sq ft | 0.028 sq ft | 1/16″ |
4″ x 4″ | 9 tiles/sq ft | 0.111 sq ft | 1/16″ |
6″ x 6″ | 4 tiles/sq ft | 0.25 sq ft | 1/8″ |
12″ x 12″ | 1 tile/sq ft | 1.00 sq ft | 3/16″ |
12″ x 24″ | 0.5 tiles/sq ft | 2.00 sq ft | 3/16″ |
18″ x 18″ | 0.44 tiles/sq ft | 2.25 sq ft | 3/16″ |
24″ x 24″ | 0.25 tiles/sq ft | 4.00 sq ft | 3/16-1/4″ |
24″ x 48″ | 0.125 tiles/sq ft | 8.00 sq ft | 1/4″ |
Tile Types and Cost Reference
Tile Type | Cost per Sq Ft | Installed Cost | Best Use |
Ceramic tile (standard) | /bin/sh.50-.00 | -/sq ft | Floors, walls, backsplashes |
Porcelain tile (standard) | .50-.00 | -2/sq ft | High-traffic floors, wet areas |
Porcelain tile (large format) | .00-0.00 | -8/sq ft | Modern open-plan floors |
Natural stone (travertine) | .00-.00 | 0-0/sq ft | Bathrooms, entryways |
Natural stone (slate) | .00-.00 | -6/sq ft | Outdoor patios, rustic floors |
Marble tile | .00-0.00 | 5-5/sq ft | Bathrooms, accent walls |
Glass mosaic | .00-0.00 | 0-5/sq ft | Backsplashes, shower accents |
Cement tile (encaustic) | .00-2.00 | 2-5/sq ft | Entryways, feature floors |
Tile Materials to Order with Your Tiles
7 accessory materials are required for most tile installations. Order all accessories at the same time as tiles.
Material | Quantity Formula | Cost Estimate | Notes |
Thinset mortar | 50 lb bag per 40-50 sq ft | 5-0/bag | Large format needs medium-bed mortar |
Unsanded grout | 10 lb bag per 50 sq ft | -0/bag | For joints under 1/8″ |
Sanded grout | 10 lb bag per 35 sq ft | -0/bag | For joints 1/8″ to 1/2″ |
Cement board | Same sq ft as tile area | /bin/sh.50-.50/sq ft | Required over wood subfloors |
Tile spacers | 4 per tile | -5/bag 100 pcs | Match to grout joint size |
Grout sealer | 1 quart per 100 sq ft | 0-5/qt | Apply after grout fully cures (72 hrs) |
Transition strips | 1 per doorway | -5 each | T-molding between tile and other floors |
Tile Installation by Room Type
Bathroom Floor Tile
A standard 5 x 8 ft bathroom floor = 40 sq ft. Order 44 sq ft (10% waste) for straight lay, 46 sq ft (15%) for diagonal. Use porcelain or ceramic with slip-resistance rating R9 or higher for wet areas. Cement board is required over wood subfloors.
Kitchen Backsplash Tile
A standard kitchen backsplash runs 30-40 sq ft. Order 33-44 sq ft with 10% waste. Use mastic adhesive over drywall and thinset over cement board.
Outdoor Patio Tile
Use porcelain with water absorption under 0.5% for outdoor installation. Add 15% waste for outdoor projects — concrete substrate unevenness increases cuts. Seal natural stone tile annually outdoors.
Frequently Asked Questions
How many tiles do I need for a 100 square foot room?
110 tiles for 12×12 tiles with 10% waste. Base count = 100 tiles. With 10% waste = 110 tiles. For 18×18 tiles: 100 / 2.25 = 45 base tiles x 1.10 = 50 tiles.
How do I calculate tile for an L-shaped room?
Break the L-shape into 2 rectangles. Calculate each rectangle separately. Add the totals together, then apply the waste factor. Measuring an L-shaped room as one unit underestimates area by 5-20%.
What grout joint size should I use?
Use 1/16″ for rectified porcelain, 3/16″ for standard ceramic tile. Large format tiles (24×24 and up) need a minimum 3/16″ joint to allow for slight size variation between tiles.
Should I add more tiles for a diagonal pattern?
Yes. Diagonal patterns need 15% extra material vs 10% for straight lay. Every board in a diagonal layout is cut at 45 degrees at wall edges — 50% more cut waste than straight lay.
How much does it cost to tile a 200 square foot floor?
00-,400 in materials only for a 200 sq ft floor. Ceramic tile: 00-00. Porcelain: 00-,400. Add /bin/sh.50-.50/sq ft for thinset and grout. Professional installation adds -/sq ft labor.
Can I tile over existing tile?
Yes for floors if existing tile is flat, firmly bonded, and the added height clears door thresholds. No for walls — the added weight exceeds typical drywall adhesion limits. Remove any loose or cracked existing tile before overlaying.
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