Construction · masonry
Concrete block & mortar calculator.
Estimate nominal block count and mortar volume from wall dimensions, openings, block size, joint allowance, and bag yield.
Wall inputs
Masonry estimate
Nominal block planning
The calculator adds a 10 mm metric or ⅜ in customary joint to the block face for the count, subtracts the exact block volume from the net wall volume, and then applies mortar waste. Bag yields vary widely by product; enter the yield printed on the bag or supplied by the manufacturer.