Concrete Block, Mortar & Fill Calculator
Count blocks from wall area and openings, with the joint included in each block position.
Your measurements
Editable exampleExample: replace these measurements
Your material list
99 concrete blocks
80 sq ft measured
Shopping list & save options
- Wall area after openings
- 80 sq ft
- Block positions before extra
- 90
- Mortar bags
- Enter product yield
- Block subtotal
- Add your price
- Core fill from supplied design
- Enter filled cores and volume per unit
The calculation
- 80 ÷ ((15.63 + 0.38) × (7.63 + 0.38) ÷ 144) = 90 block positions
- 90 × (1 + 10/100), rounded up = 99 blocks
Before ordering, use the concrete measurement, yield & order handoff guide to check the inputs and take the right questions to the supplier. Choose another calculator.
How to plan the quantity
Use actual face dimensions plus one mortar joint to get the repeating block position. The calculation divides net wall area by that position area, then adds your chosen allowance.
Corners, ends, bond beams and openings may need special units. Separate those from ordinary stretchers on the supplier order.
Mortar yield depends on the block and how it is laid. Enter blocks per bag from the selected mortar guidance; otherwise mortar stays unpriced and uncounted.
Before you order
- Area rounding does not produce a running-bond cut schedule or a structural design.
- Footings, reinforcement, grout-filled cores, lintels and wall stability need a design; they are not mortar-bag allowances.