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Tile Calculator

Estimate tile quantity, required boxes, grout spacing, waste allowance, material weight, and project cost for floor and wall tiling projects. Supports metric and imperial units.

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Select project type, shape, tile dimensions, and calculator inputs.

Floor installations use durable, slip-resistant, and thicker tiles designed to support weight. Standard grout width is usually 1/8" (3mm) to 1/4" (6mm).

Area Dimensions

Tile Specifications

in
in
in
10%

Packaging & Logistics (optional)

lbs

Calculation Results

Awaiting Calculations

Fill in the room shape, dimensions, tile choices, and click Calculate to view estimations.

Formula Details

Surface Area Formula
Area calculations vary by Room Shape:

Rectangle: Area = Length × Width Square: Area = Side × Side Circle: Area = π × (Diameter / 2)² Triangle: Area = 0.5 × Base × Height L-Shaped: Area = (Section 1 Length × Section 1 Width) + (Section 2 Length × Section 2 Width)

Variables Explained
  • Length / Width
    Dimensions:Measurements of the rooms or walls being tiled.
Tile Coverage Area Formula
Nominal Tile Area = (Tile Length + Grout Width) × (Tile Width + Grout Width)

Calculates the total surface area covered by a single tile, including its surrounding grout lines.

Variables Explained
  • Tile Length
    Length:Physical length of the selected tile.
  • Tile Width
    Width:Physical width of the selected tile.
  • Grout Width
    Grout Joint Spacing:Width of the joint space between tiles (defaults to 0 if not provided).
Tile Quantity Formula
Tiles Required = (Surface Area / Nominal Tile Area) × (1 + Waste Percentage / 100)

Estimates the total number of tiles needed by dividing the room area by nominal tile area, then adding a waste percentage and rounding up to the nearest whole tile.

Variables Explained
  • Surface Area
    Total Area:The calculated surface area of the floor or wall.
  • Waste Percentage
    Waste Allowance:Additional tile buffer percentage for cut pieces and corner fits (usually 10%).
Waste Allowance Formula
Waste Allowance (Tiles) = Tiles Required - Raw Tiles Count (Rounded Up)

Determines how many extra tiles are bought specifically for waste, cuts, and replacements.

Variables Explained
  • Raw Tiles Count
    Net Tiles Needed:The raw calculated number of tiles without waste added.
Boxes of Tiles Formula
Boxes Required = Tiles Required / Tiles Per Box

Converts individual tile requirements into boxes to buy, rounded up to the nearest whole box.

Variables Explained
  • Tiles Per Box
    Pack Quantity:The number of individual tiles packaged in a single box.
Estimated Cost Formula
Estimated Cost = Tiles Required × Cost Per Tile

Calculates the total project tile cost based on individual tile price.

Variables Explained
  • Cost Per Tile
    Unit Cost:The retail cost of a single tile.

Calculation Example

Worked Example
Scenario

Calculate tile requirements for a bathroom floor measuring 10 feet long and 8 feet wide. Use 12" × 12" tiles with a 1/8" (0.125") grout joint width, 10% waste allowance, 10 tiles per box, and $3.50 cost per tile.

Calculation Steps
  1. 1.Calculate total floor area.
    Area = 10 ft × 8 ft = 80 sq ft
  2. 2.Compute nominal tile dimensions in feet.
    Nominal Length = 12" + 0.125" = 12.125" (1.0104 ft) | Nominal Width = 12" + 0.125" = 12.125" (1.0104 ft)
  3. 3.Compute nominal tile coverage area.
    Nominal Tile Area = 1.0104 ft × 1.0104 ft = 1.0209 sq ft
  4. 4.Compute raw tiles needed.
    Raw Count = 80 sq ft / 1.0209 sq ft = 78.36 Tiles
  5. 5.Apply 10% waste allowance and round up.
    Tiles Required = 78.36 × 1.10 = 86.20 => 87 Tiles
  6. 6.Calculate boxes of tiles required.
    Boxes Required = 87 / 10 = 8.70 => 9 Boxes
  7. 7.Calculate waste tiles.
    Waste Tiles = 87 - ceil(78.36) = 87 - 79 = 8 Tiles
  8. 8.Calculate overall cost.
    Total Cost = 87 Tiles × $3.50 = $304.50
Final Quantity Needed87 Tiles (9 Boxes), 8 Waste Tiles, and a total cost of $304.50.
Worked Example
Scenario

Calculate metric quantities for a kitchen backsplash wall measuring 3.6 meters long and 0.75 meters high. Use 100 × 100 mm tiles, a 2 mm grout joint, 10% waste, and ₹40 per tile.

Calculation Steps
  1. 1.Calculate total wall area.
    Area = 3.6 m × 0.75 m = 2.7 sq m
  2. 2.Compute nominal tile dimensions in meters.
    Nominal Length = 100 mm + 2 mm = 102 mm (0.102 m) | Nominal Width = 100 mm + 2 mm = 102 mm (0.102 m)
  3. 3.Compute nominal tile coverage area.
    Nominal Tile Area = 0.102 m × 0.102 m = 0.010404 sq m
  4. 4.Compute raw tiles needed.
    Raw Count = 2.7 sq m / 0.010404 sq m = 259.5 Tiles
  5. 5.Apply 10% waste and round up.
    Tiles Required = 259.5 × 1.10 = 285.45 => 286 Tiles
  6. 6.Calculate waste tiles.
    Waste Tiles = 286 - ceil(259.5) = 286 - 260 = 26 Tiles
  7. 7.Calculate total cost.
    Total Cost = 286 Tiles × ₹40 = ₹11,440
Final Quantity Needed286 Tiles, 26 Waste Tiles, and a total cost of ₹11,440.
Worked Example
Scenario

Calculate tile requirements for an L-shaped living room floor. Section 1 is 18 feet by 15 feet. Section 2 is 8 feet by 6 feet. Use 24" × 24" (2 ft × 2 ft) large tiles, 1/8" (0.125") grout joint, 12% waste, 5 tiles per box, and 8.5 lbs tile weight.

Calculation Steps
  1. 1.Calculate total floor area by adding the two sections.
    Area = (18 ft × 15 ft) + (8 ft × 6 ft) = 270 + 48 = 318 sq ft
  2. 2.Compute nominal tile dimensions in feet.
    Nominal Length = 24" + 0.125" = 24.125" (2.0104 ft) | Nominal Width = 24" + 0.125" = 24.125" (2.0104 ft)
  3. 3.Compute nominal tile coverage area.
    Nominal Tile Area = 2.0104 ft × 2.0104 ft = 4.0417 sq ft
  4. 4.Compute raw tiles needed.
    Raw Count = 318 sq ft / 4.0417 sq ft = 78.68 Tiles
  5. 5.Apply 12% waste allowance and round up.
    Tiles Required = 78.68 × 1.12 = 88.12 => 89 Tiles
  6. 6.Calculate boxes required.
    Boxes Required = 89 / 5 = 17.80 => 18 Boxes
  7. 7.Calculate estimated total tile weight.
    Total Weight = 89 Tiles × 8.5 lbs = 756.5 lbs
Final Quantity Needed89 Tiles (18 Boxes), with an estimated weight of 756.5 lbs.

How to Use

Follow these steps to estimate tile quantities, grout allowances, packaging boxes, and overall material costs:

  1. Select Project Type: Choose Floor Tiling or Wall Tiling to set contextual expectations and default grout joint widths.
  2. Select Room Shape: Select from Rectangle, Square, Circle, Triangle, or L-Shaped.
  3. Choose Unit System: Toggle between Imperial (ft/in/yd) and Metric (m/cm/mm) in the top right.
  4. Enter Dimensions: Fill in the required room measurements matching the selected room shape.
  5. Select Tile Size: Choose a preset standard tile size or select "Custom Tile Size" to enter specific tile length and width.
  6. Set Grout and Waste: Adjust the grout joint width and slide the waste percentage (10% is recommended for straight runs, 15% for diagonal layouts).
  7. Optional Details: Enter tiles per box, unit tile weight, or tile cost to get packaging, weight, and pricing breakdowns.
  8. Calculate: Click Calculate to view all results instantly in the results card stack. Click Reset to clear the form.

Frequently Asked Questions

How many tiles do I need?
Divide the total surface area of your floor or wall by the coverage area of a single tile. If you are using grout spacing, make sure to add the grout joint width to both the length and width of the tile to find its nominal coverage area. Always add a waste allowance (10% is standard) for cuts.
How much waste should I allow for tiling?
For standard rectangular layouts, a 10% waste allowance is recommended. If the room has curves, diagonals, or an L-shape, allow 12% to 15% waste, as these patterns require more complex cuts and diagonal trims.
How many tile boxes should I buy?
Tiles are sold in boxes. Check the box details for 'Tiles Per Box'. Divide the total tiles required by the tiles per box, and round up to the nearest whole box. Buying complete boxes protects tiles from shipping damage and ensures consistent dye lots.
Does grout joint spacing affect tile quantity?
Yes. Grout lines increase the effective footprint of each tile. For small tiles (like 4" × 4") or wide joints, grout spacing can significantly reduce the number of tiles required. For large tiles, the difference is negligible, but it is still recommended to calculate with grout spacing for accuracy.
Can I calculate using custom tile sizes?
Yes. Choose 'Custom Tile Size...' in the Tile Size Preset dropdown. The Length and Width fields will unlock, allowing you to enter any custom tile specifications in inches (Imperial) or millimeters (Metric).
How accurate is this tile estimate?
This calculator provides a precise geometric estimation. Real-world requirements may vary slightly depending on your tiling pattern (e.g. brick bond, herringbone, diagonal) and cuts. We recommend purchasing a small excess (at least 1 extra box) to keep as spares for future repairs.

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Disclaimer

Calculations are estimates based on the values you enter and standard engineering formulas. Results are intended for planning and estimation only. Always verify critical measurements, specifications, and local building requirements before purchasing materials or beginning construction.