Spike's Calculators


Slate Roof Tiles - Imperial

Spike's Calculators

Calculate the number of Slate tiles needed based on the square footage of the roof. Slate roofing tiles come in various sizes.

Slate Roof Tiles

Slate Roof Tiles

Roof Area ft²
Head Lap in
Tile Length in
Tile Width in
Waste %


Tile Exposure in²
Number of Tiles per Square #
Tiles Needed tiles
Waste Percentage Adds # of tiles
Total # of Tiles Needed tiles


  1. enter the area of the roof in square feet
  2. slate tile head lap in inches
  3. tile length in inches
  4. tile width in inches
  5. waste percentage preset @ 12%


  1. exposure of the tile in square inches
  2. number of tiles needed to cover one square
  3. amount of tiles needed based on square footage
  4. number of tiles added for waste
  5. total number of tiles needed
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