Concrete Block Wall Calculator

Estimate concrete blocks, courses, mortar, wall area, waste, and cost for a concrete block wall.

Measurement inputs

Live calculation

Project name

Wall name / block term Concrete block wall labels and preview are active.

Unit system

Concrete block size Common sizes use nominal wall module.

Wall length

Enter a wall length greater than 0.

Wall height

Enter a wall height greater than 0.

Custom block length

Enter a custom block length greater than 0.

Custom block height

Enter a custom block height greater than 0.

Custom block depth

Enter a custom block depth greater than 0.

Mortar joint

Mortar joint cannot be negative.

Openings area

Openings must be smaller than the wall area.

Waste

5% simple wall, 10% normal wall. Waste cannot be negative.

Concrete block price Leave blank if you only need quantity. Block price cannot be negative.

Mortar estimate Uses a simple joint-volume estimate.

Live block wall preview

Concrete block wall

Length–

Height–

Block size–

Wall term–

Results

Block wall estimate

Concrete blocks with waste

Includes waste.

–

Wall area–

Net wall area–

Base concrete blocks–

Courses–

Concrete blocks per course–

Opening deduction–

Mortar estimate–

Estimated concrete block cost–

This is an estimate. Confirm final block count and mortar with your supplier or contractor.

Formula used

Blocks = Net wall area ÷ Block face area

Common block sizes use nominal modular dimensions, such as 16 in length by 8 in height.

Calculation steps