Estimate how many concrete blocks and bags of mortar your wall needs. Each dimension has its own unit selector (in/ft/yd/m).
Concrete masonry units (CMU) are estimated by wall area. Measure each wall's length and height (any unit), subtract openings, then multiply the net area by blocks-per-square-foot. A standard 8x8x16 block needs about 1.125 per sq ft - use the preset. Add about 5% for breakage, and plan roughly three 80-lb mortar bags per 100 blocks.