A panel flange bending tool is disclosed, which includes a head coupled to an arm. The head includes a panel engaging portion, first and second bending corners, and an abutment. The panel engaging portion includes a flange slot having a slot plane extending in a proximal direction from a distal slot opening to a proximal slot end, the slot opening sized to receive a panel flange. The first bending corner is aligned with the flange slot, and the first and second bending corners define a first bending plane. The abutment extends proximal of the first and second bending corners. The second bending corner and the abutment define a second bending plane. The slot plane, the first bending plane, and the second bending plane intersect each other triangularly at first and second internal bending angles. The first and second internal bending angles are less than or equal to 90 degrees.