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

Calculation

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

Results

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