Concrete Block Size Calculator

Estimate concrete block count by wall size, block size, block shape, block type, mortar joint, openings, waste, and cost.

Measurement inputs

Use block size, shape, and type as separate choices.

Live calculation

Project name This name appears in the PDF and saved report.

Unit system

Block size

Wall length

Enter a wall length greater than 0.

Wall height

Enter a wall height greater than 0.

Block shape

Block type

Mortar joint thickness

Common US value is 3/8 in. Enter a mortar joint of 0 or more.

Waste percentage Use 5% simple, 10% normal, 15% complex. Waste cannot be negative.

Cost per block Leave blank if cost is not needed. Cost cannot be negative.

Custom block size

Custom size basis

Block length

Enter a block length greater than 0.

Block height

Enter a block height greater than 0.

Block width / depth

Enter a block width greater than 0.

Advanced options: openings and special blocks

Number of openings Doors or windows with same size. Openings cannot be negative.

Wall corners Used to estimate corner blocks. Corners cannot be negative.

Opening width

Enter an opening width greater than 0.

Opening height

Enter an opening height greater than 0.

Bond beam courses Special count only. Replaces normal blocks. Bond beam courses cannot be negative.

Cap courses Usually 1 top course when needed. Cap courses cannot be negative.

Live block wall preview

The wall diagram updates with block size, shape, and type.

Block size–

Courses–

Blocks / course–

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Concrete block results

Main quantity, block layout, special blocks, formula, and calculation steps.

Blocks to order with waste –

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Base block count–

Waste blocks–

Wall area–

Estimated cost–

Selected shape–

Selected type–

Mortar joint–

Block face coverage–

Block layout details

Special block estimates

Formula used

Calculation steps