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Cement Mortar Mix Calculator

Calculate cement bags and sand needed for a mortar mix ratio.

How this is calculated
Dry volume = Wet volume × 1.33; Cement volume = Dry volume × (Cement parts ÷ Total parts); Bags = ⌈Cement volume ÷ 1.25 cu ft⌉

Assumptions used in this calculation

  • Standard bag size: Assumes a standard 50kg cement bag with a volume of 1.25 cubic feet and a dry-to-wet volume factor of 1.33.

About this calculator

The cement mortar mix calculator splits a total mortar volume by ratio into cement and sand quantities, then converts the cement volume into standard 50kg bags, accounting for the dry volume increase over wet volume.

Worked example

100 cu ft mortar, 1:4 cement:sand ratio

Result: ≈ 22 cement bags

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