When drawing a hipped roof in plan view, the hip angle when shown on a 2D plan will always be 45degrees if the roof pitch is the same on all roof planes.

If the roof has 2 different roof pitches, the angle of the hip will not be 45degrees.

This calculator will determine the hip angle for a 2 different pitched hip roof.

To use the calculator, enter the Roof Pitches into the Text boxes then click calculate.

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These 2 calculators will convert a gradient to degrees and degrees to a gradient.

DOWNLOAD - Gradient to Degrees
DOWNLOAD - Degrees to Gradient