Masonry

Concrete Block Calculator

Estimate concrete block quantity for a wall from block face dimensions and waste allowance.

Project details

Wall length (ft)

Wall height (ft)

Nominal block length (in)

Nominal block height (in)

Waste allowance (%)

Wall area—

Blocks incl. waste—

Planning estimate only. Confirm product dimensions, package coverage and project requirements before purchasing.

Wall area is divided by the nominal face area of one masonry unit, then waste is added.

blocks = wall area ÷ nominal block face area

Bond beams, lintels, corners and specialty units should be planned separately.

Does this include mortar?

No. This estimates masonry units only.

Are nominal and actual block sizes the same?

No. Use dimensions appropriate for your product and layout.

What about doors and windows?

Subtract significant openings for a refined estimate.