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Block Wall Calculator

Wall area converted into a block count, using the standard 8×16 inch CMU coverage rate.

Standard CMU coverage

This uses the common 8×16 inch concrete masonry unit (CMU) at 1.125 blocks per square foot, accounting for the mortar joint — half blocks, corner blocks, and other specialty units may be needed separately at openings and corners.

Don't forget mortar and rebar

This calculator covers block count only — a block wall also needs mortar mix and typically vertical rebar with grout fill at regular intervals for structural walls, which this doesn't estimate.

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Block Wall Calculator

Wall area converted into a block count, using the standard 8×16 inch CMU coverage rate.

Wall area (sq ft)

Waste factor (%)

Blocks needed

248

Based on standard 8×16 in concrete block (1.125 blocks per sq ft including mortar joints).

What you entered

Wall area (sq ft): 200Waste factor (%): 10

1
Base block count (1.125 blocks/sq ft)
200 × 1.125= 225 blocks
2
Add 10% waste
225 × 1.10= 248 blocks

Result

Blocks needed: 248

A 200 sq ft wall needs about 248 concrete blocks, including a 10% waste allowance.

Standard CMU coverage

Don't forget mortar and rebar

This calculator covers block count only — a block wall also needs mortar mix and typically vertical rebar with grout fill at regular intervals for structural walls, which this doesn't estimate.