Gambrel Roof Calculator

Symmetric gambrel geometry excluding overhangs,overlaps and cutting waste; not member sizing or structural capacity.

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Result

Enter your values and run the tool to see your result.

Check the units, enter your values, and run the tool. Results follow the assumptions and method below.

Ridge height above eaveslowerRun*tan(lower*pi/180)+(span/2-lowerRun)*tan(upper*pi/180)

One-side lower slope lengthlowerRun/cos(lower*pi/180)

One-side upper slope length(span/2-lowerRun)/cos(upper*pi/180)

Total roof surface area2*length*(lowerRun/cos(lower*pi/180)+(span/2-lowerRun)/cos(upper*pi/180))