What size is a half acre lot? Leave a Comment / General Greatest Reply One acre is 43,560 sq ft. One half acre is 21,780 sq ft. Nonetheless, that does not assist most individuals a lot when making an attempt to image how massive a lot is. Extra Solutions 21,350 Read More: What tims is 9pm PST in Central time? How many linear ft in 1 acre? READ: What is 2000 divided by 200?