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Roof Area calculator.

This will provide an area calculation for clay or concrete roof tile, natural or composite slate, underfelt or breathable felt and ridge length.

Gable & Hip Roofs will have the same area provided that the pitch remains the same.

Roof A dimensions only will give you the area of a straight gable end or hipped roof.

Roof A & Roof B dimensions will provide the total exposed roof areas (the hidden area is subtracted from the total).

Enter the dimensions below, then click calculate to calculate the Area. Roof A and B can be calculated separately or together. There is a separate calculation at the right of the form for a simple "shed" roof.

The calculation of Roofs A and B require a gable height or fall to be entered. If you don't know these, but do know the pitch angle, then the fall can be calculated by selecting the nearest angle in the box below.

  degrees gives a fall of 

Roof A Roof B Shed
Diagram of straight roof Diagram of angled roof Diagram of one-sided roof
Dimensions Dimensions Dimensions
Length in Metres Length in Metres Length in Metres
Width in Metres Width in Metres Width in Metres
Gable Height Gable Height Height in Metres
OR    a fall of in 12 OR    a fall of in 12 OR    a fall of in 12
Area Roof A m2 Area Shed Roof m2
Area Roof B m2
Area Roof A & Roof B m2
Hidden Area m2
Roof B Ridge Length m
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