Masonry Mortar Calculator

Add each wall or area separately to get a full material breakdown

Metric (m) Imperial (ft / in)

Masonry Unit Type

Mix Ratio (cement : sand)

Additive (optional)

Waste Factor (%)

10%

Typical 10%. Stone or complex work: 15-20%.

Enter costs in your local currency - the calculator works with any currency as long as values are consistent.

Cement per 25kg bag

Sand per tonne

Wall / Area	Area (m²)	Net Mortar (m³)	+ Waste	Total (m³)

Total Area

m² net (after deductions)

Net Mortar

m³ before waste

Total to Mix
-
m³ inc. waste

Mix Ratio

cement : sand

Material	Per m³ mortar	Net total	+ Waste	Order qty

1:3 - Strong structural mix. Below DPC, retaining walls, engineering bricks, exposed parapets.
1:4 - General purpose. External walls above DPC, most residential brickwork.
1:5 - Medium strength. Internal walls, sheltered or protected brickwork.
1:6 - Weak/flexible. Soft or old bricks, lime-based restoration, chimneys.
Lime addition - Adding lime (typically 1:0.5:4.5 or 1:1:6 cement:lime:sand) improves workability, flexibility and weather resistance.

Figures include 30% dry-material bulking factor. Sand density assumed 1600 kg/m³, cement 1440 kg/m³.