A multi-functional carpentry tool includes a base member having a longitudinal T-shaped groove formed therewithin and a rule member. A T-shaped slide member is positioned within the groove and has a threaded aperture formed therewithin. A knob has a threaded stem operatively received within the threaded aperture for selectively securing the base member and the rule member together in frictional engagement maintaining the base member and the rule member in selected positions relative to one another and permitting each of a sliding and pivoting movement of the rule member relative to the base member. Linear measuring scale indicia is provided in each of the base and rule members. Angular measuring scale indicia and a squaring groove is also provided within the base member. A spring biased pin is movably mounted within the knob for defining pivot axis and facilitating arc scribing effort.