Work out roof tile quantity instantly with clear inputs, formula shown and shareable results.
Tile quantity is slope area times the tiles per square metre for the chosen tile and gauge, plus a cutting allowance for verges, valleys and breakage. Ridge tiles run about 2.5 per metre, and battens at a 300 mm gauge need roughly 3.3 metres of batten per square metre of roof.
Tile count
Tiles = slope area x tiles per m² x (1 + wastage)
Battens
Batten metres = area / gauge in metres
Tiles = slope area x tiles per m² x (1 + wastage). Tile quantity is slope area times the tiles per square metre for the chosen tile and gauge, plus a cutting allowance for verges, valleys and breakage.
It depends on tile size and the batten gauge, which is set by the roof pitch: shallower pitches need more headlap, closer gauge and therefore more tiles per square metre.
This calculator takes 4 inputs: Roof slope area, Tiles per square metre, Cutting and breakage allowance, Ridge and hip length. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.