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` = "Interface Angle"`

162.8935

The **Interface Angle** calculator computes the outer angle made by two intersecting right triangles defined by their pitch.

**INSTRUCTIONS**: Enter the following:

- (
**P1**) Pitch 1 - (
**P2**) Pitch 2

**Interface Angle (B): **The calculator returns the angle in degrees. However, this can be automatically converted to compatible units via the pull-down menu.

The formula for the exterior angle of intersection of two right triangles is:

B = π + P1 - P2

where:

- B = Interface Angle
- P1 = Angle 1
- P2 = Angle 2

Note: P1 and P2 are two pitches. They are converted to radian angles.

**Pitch to Slope**: This converts pitch (e.g., 4/12) to slope.**Pitch to Angle**: This converts pitch (e.g., 10/12) to an angle in degrees.**Rise over Run to Angle**: This converts rise over run to an angle in degrees.**Gambrel Angle**: Computes the bend at the intersection of two slope as in a gambrel roof.**Interface Angle**: This computes the interface angle between two sloped surfaces.**Interface Angle from Rise over Run**: This computes the interface angle based on two rises and runs.**Trusses Needed for a Roof**: This computes the number of trusses needed for a roof based on the ridge length and truss spacing**Roof Section Area**: This computes the surface area of an irregular shaped section of a roof.**Gable Roof Geometrie**s: This computes the lengths and measurements for a gabled roof based on the ridge length, pitch, span and overhang.**Dormer Geometries**: This computes the measurements for a gable dormer based on the dimension of the dormer and main roof..**Hip Roof Geometries:**This the metrics associated with a hip roof based on the dimensions.**Double Hip Roof Geometries**: This compute the lengths of the dimensional lines where one hip roof intersects another such as in a dormer.**Pyramid Hip Roof Geometries**: This computes the lengths and dimensional lines of a pyramid roof.**Gambrel Pitch Angles**: This computes the pitch angles and rafter lengths in a gambrel roof bases on the span, total height, and height and width of the loft.**Gambrel Rafter Lengths**. This computes the upper and lower rafter lengths, attic width and total height under a gambrel roof based on the upper and lower pitch, span and loft height.**Rafter Length**: This computes the length of the rafters based on the span, pitch and overhang.**Corrugation Factor**: This computes the material length associated with a structural length using corrugated material.