Precast Concrete Countertop Mixers: Which Size, Power & Drum?
These small mixers are inexpensive and fairly portable. Two hundred pounds of concrete is just about 1-1/3 cubic feet of concrete; at 1-1/2" thick, that amount of concrete makes around 10.5 square feet of countertops. The largest mixers top out at 12 cubic feet, and can make 1100 pounds, or 7-1/3 cubic feet of concrete in a single batch.