Roof angle from rise and run

Calculates roof slope percent from rise and horizontal run.

Converts roof plan area into approximate sloped roof area using the pitch angle.

Calculates sloped roof area from plan area and roof angle plus required material area with waste.

Helper calculation of geometric rafter length from run and rise; it is not code-based design.

Calculates stair slope angle from riser height and tread depth.

Calculates single riser height from total rise and riser count.