Block Mortar Calculator

Calculate the number of mortar bags (80 lb) or cement-sand quantity needed for laying concrete blocks.

Total Concrete Blocks 300 Blocks

100 300 500 1,000

Mortar Joint Thickness 3/8 inch (0.375 in)

Premixed Mortar Required

10 Bags

Total Mortar Volume: 6.7 cu ft

Cement Bags (50kg)

~ 3 Bags

Sand Required

~ 0.35 Tons

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Frequently Asked Questions

Understanding mortar calculations for block walls.

One standard 80 lb bag of premixed masonry mortar yields approximately 0.67 cu ft of wet mortar, which is sufficient to lay about 30 to 35 standard 8x8x16 concrete blocks.

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