Concrete Block Calculator

How many concrete blocks do I need?

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Order this much 8 × 16 in block

284concrete blocks

Nominal 8 × 16 in faces at 1.125 per sq ft, with 5% extra for cuts and breakage. Reinforcement and foundations follow your plans and local code.

40 ft6 ft9 courses × 30 block
Wall area240 sq ft
Courses9
Block per course30
Pallets3.2
80 lb mortar mix bags (13 block each)22
Or 70 lb masonry cement bags (46 block each)7, plus 0.8 tons sand

Enter a wall and get standard 8 × 16 inch block, courses and mortar in the bags you will actually carry.

How it works

A nominal 8 × 16 inch face covers 0.889 square feet, so you need 1.125 per square foot. Wall area minus openings, plus 5%.

Before you order

  • Lay out the first course dry to reduce cut block at the ends.
  • Order corner and bond-beam units separately if your wall needs them.
  • Pallets are heavy, so ask for delivery as close to the work as your surface can support.

Common questions

How many blocks per square foot?

1.125 for standard 8 × 16 inch block, which includes the mortar joint in its nominal size.

How much mortar does block take?

A premixed 80 lb bag lays about 13 block. A 70 lb bag of masonry cement mixed with sand lays about 46.