Calculate the total area of a gambrel (barn-style) roof with its dual-slope design — steep lower slopes and shallow upper slopes for maximum attic space.
Enter dimensions — upper slope pitch can be adjusted
A gambrel roof is a symmetrical two-sided roof with two slopes on each side. The lower slope is steep (typically 60°) and the upper slope is shallower. This design maximizes usable attic/loft space and is iconic on barns and Dutch Colonial homes.