How to Build Legs for an A-Frame Desk

Adjust the miter saw setting to cut a 15-degree angle and cut 8 pieces of 2-inch by 4-inch lumber to 36 inches; cut the ends to run parallel. Reset the miter saw to make a 90-degree, or straight, cut, and cut 4 more lengths of 20 inches. This is suitable for a desktop no wider than about 25 inches.

Lay one of the straight end planks on the work surface, resting on a 2-inch side. Center the other straight end plank on top of this plank, resting on a 4-inch side. The ends of both planks should be flush and form a "T" for the top of one leg unit. Screw the top plank into the bottom one with 6 evenly spaced screws. Repeat with the remaining two straight end planks.

Invert the "T" shaped top so that it is now resting on its 4-inch side. Position two legs -- the mitered 36-inch planks -- 3 inches from one end of the sawhorse top. The ends of the legs should sit flush against the center plank of the leg unit top and flush against the floor.

Screw the legs onto the leg unit top: 2 screws into each plank of the top and 4 screws per leg. Repeat with two more legs on the other end of the leg unit top, so that the one leg unit is nearly complete. Repeat with the remaining four legs so you have two leg units nearly complete.

Measure 5 inches up from the bottom of the legs, then measure the gap between both legs at this point. Cut a length of 2-by-4 lumber to this measurement, and miter the ends in opposing angles of 15 degrees. Sit the plank across both legs, and use 2 screws on both legs to secure them in place. Repeat on the other side and the other leg unit to finish the A-frame desk legs.