Roof Area Calculator

Roof Width (Horizontal Projection) (m)

Roof Length (m)

Slope Representation

Slope Angle (°)

Roof Thickness (m)

Rafter Length:

Ridge Board Length (C):

Roof Rise Height:

Roof Area:

Roof Volume:

Slope Percentage:

Slope Angle:

Slope Ratio:

About the Sloped Roof Calculator

This calculator is designed for the construction industry to quickly compute the key parameters of a sloped (pitched) roof, including rafter length, ridge length, rise height, area, and volume, helping builders, designers, and property owners estimate material quantities and construction plans.

Formulas

Rafter length = √((width/2)² + rise height²)
Ridge length = roof length
Rise height = (width/2) × tan(pitch angle) or (width/2) × pitch ratio
Roof area = 2 × rafter length × roof length
Roof volume = roof area × roof thickness