Estimate how many cinder blocks and bags of mortar your wall needs. Each dimension has its own unit selector (in/ft/yd/m).
Cinder block, like concrete block, is estimated by wall area. Measure each wall (any unit), subtract openings, and multiply the net area by 1.125 for a standard 8x8x16 block. Add about 5% for breakage and plan about three 80-lb mortar bags per 100 blocks.