Updated Masonry & Structure

Block Calculator

Estimate CMU and concrete blocks, wall coverage, mortar, rebar, grout fill, weight, pavers and project costs with this all-in-one block calculator.

CMU & Concrete Blocks Rebar & Grout Fill Weight & Cost Planning

Block, Rebar, Mortar & Grout Estimator

Calculation Mode

Length Units Main field = feet or metres, extra field = inches or centimetres.

Block Face Size Face dimensions are used to estimate blocks per square foot or per square metre.

Custom Block Face Size

Enter the exposed face dimensions of one block.

Mortar Joint Thickness Inches if using feet/inches, centimetres if using metres/centimetres. Typical joint ≈ 3/8 in or 10 mm.

Wall Height

Wall Length

Openings Area to Subtract (optional) Use this to subtract doors and windows from a single wall.

Waste / Breakage Factor (%) Extra blocks for cuts, breakage and layout. Common values: 5–10%.

Shared Wall Height

Number of Walls Only walls with non-zero length are included.

Wall 1 Length

Wall 2 Length

Wall 3 Length

Wall 4 Length

Wall 5 Length

Wall 6 Length

Average Openings Area per Wall

Waste / Breakage Factor (%)

Total Wall Area Before Openings

Number of Doors

Door Size (each)

Number of Windows

Window Size (each)

Additional Openings Area (optional) Use this for niches, vents or non-rectangular openings (same units as wall area).

Area or Block Count for Mortar

Mortar Richness Factor Use values above 1.0 for deeper joints or heavy parging.

Mortar Volume

Yield per Bag Typical 80 lb pre-mixed bag yields about 0.6 ft³ of mortar.

Price per Mortar Bag ($)

Wall Height

Wall Length

Vertical Rebar Spacing (centre-to-centre) Spacing along the wall length. Inches if using feet, centimetres if using metres.

Horizontal Rebar Spacing (lift or bond beam spacing)

Bar Stock Length Typical stock length is 20 or 40 ft.

Rebar Size Used for approximate weight per foot only.

Block Wall Height

Block Wall Length

Wall Thickness (nominal block thickness)

Percentage of Cells / Cores Filled (%) Use higher percentages for fully grouted walls or heavily reinforced areas.

Grout Overfill / Waste Factor (%)

Total Blocks

Weight per Block

Blocks per Pallet

Total Blocks

Price per Block

Price per Thousand Blocks (optional) If set, this overrides price per individual block.

Labour Cost per ft² of Wall ($)

Estimated Wall Area for Labour

Miscellaneous Materials & Overheads ($)

Paved Area Length

Paved Area Width

Sand Bedding Depth Inches if using feet, centimetres if using metres.

Gravel Base Depth

Paver Waste / Cut Factor (%)

Block Calculator

Block, Rebar, Mortar & Grout Estimator

Area & Coverage

Blocks, Rebar & Pavers

Mortar, Grout & Materials

Cost & Planning Notes

Block Calculator

Block, Rebar, Mortar & Grout Estimator

Area & Coverage

Blocks, Rebar & Pavers

Mortar, Grout & Materials

Cost & Planning Notes

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