MAXScanner calculator widget

Concrete Block Calculator — CMU Blocks, Mortar, Grout, Pallets & Cost

Editable live calculator

Change any input — the result updates immediately

No hidden assumptions. Inputs, units and the working stay visible so you can check the calculation.

Wall length (ft) Wall height (ft) Number of similar walls Total door/window openings (sq ft) Actual block face length (in) Actual block face height (in) Actual block width/depth (in) Mortar joint thickness (in) Block waste / cuts allowance (%) Blocks per mortar bag Use the mortar product coverage for the actual joint and block condition.Blocks per pallet Use the supplier pack quantity.Installed blocks with cores filled (%) Enter 0 when core-fill grout is not part of this estimate.Approximate block core-void fraction (%) Use manufacturer geometry or project takeoff data when available.Grout bag yield (cu ft) Only used when grout-fill percentage is above zero.Price per block (optional) Price per mortar bag (optional) Price per grout bag (optional)

Calculated result

189 concrete blocks

160 sq ft net wall face · 180 blocks before allowance

6 mortar bags at 33 blocks per entered bag coverage

3 pallets at 72 blocks per pallet

Core-fill grout skipped because entered fill percentage is 0%.

Enter local unit prices only when you want a material subtotal.

Show the working

1. Net wall area = 20 × 8 × 1 − 0 = 160 sq ft.
2. Block module face = (15.625 + 0.375) in × (7.625 + 0.375) in = 0.88889 sq ft.
3. Base blocks = 160 ÷ 0.88889 = 180; purchase = ceil(base × 1.05) = 189.
4. Mortar bags = ceil(189 ÷ 33) = 6; pallets = ceil(189 ÷ 72) = 3.
5. No core-fill grout requested.

Quantity planning only. Reinforcement, bond beams, grout placement and structural/code requirements are not selected by this calculator.

Shared links reopen these inputs; saved calculations stay in this browser unless you clear site data.