Master construction math like a pro with this free and easy app. It handles feet and inches, and is loaded with simple wizards for handling anything to do with construction.

Wizards:

Basic arithmetic with carpenter fractions.

Diagonals for squaring up layouts and more.

Stairs for quick and easy riser calculation.

Common rafters, lean to rafters, and jack rafters.

Hip roofs (excepts unequal roof pitches).