Mortar Bag Quantity Calculator

How the mortar bag quantity calculator works

Allowance-adjusted masonry-unit equivalent = unit count × (1 + allowance percentage / 100). Whole mortar bags = ceil(adjusted equivalent ÷ entered masonry units covered per bag). Unit count is whole and nonnegative; product coverage must be positive.

Purchased coverage capacity is whole bags × entered units per bag. Bag cost extends the price over whole bags and rounds half-up to cents. One delivery charge rounds separately and applies only to a positive bag count. Zero masonry count means no bags or delivery.

Coverage is specific to unit size, joint dimensions, mortar product and package. The example 12-unit coverage is an illustrative input, not a universal bag yield. This calculator does not select mortar type, joint thickness, bond pattern or structural assembly. Manufacturer estimates are approximate and may need an additional allowance for actual site losses.

Worked example

500 masonry units with a 10% allowance gives 550 unit-equivalents. At an entered 12 units covered per bag, 45.833 bags rounds to 46. At an illustrative 8/bag, material costs 368; adding 50 delivery gives 418. For 240 units, the same assumptions require 22 bags and total 226.

Sources and assumptions

The source material explains the underlying calculation or pricing structure. Entered prices, costs, schedules and scenario choices are your assumptions; this tool does not obtain supplier quotes or predict actual results.

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