how tall is a cinder block
Rating Newest Oldest. Best Answer: A typical concrete cinder block has a nominal dimension of 8 x 8 x 16. The actual size is 7-5/8 x 7 5/8 x 15-5/8. This allows for a 3/8 inch mortar joint. I think they were supplied so that you could compute for the perimeter, the area and the volume.