Free Brick Calculator: Bricks, Cement and Sand for a Wall

How the count is worked out

Bricks = wall volume ÷ the volume of one brick with its mortar. A modular brick with a 10 mm joint counts as 200 × 100 × 100 mm, or 0.002 m³.

Mortar = wall volume − the volume of the bricks themselves. Dry mortar = wet mortar × 1.33.

Cement bags = dry mortar × 1 ÷ (1 + sand parts) ÷ 0.0347. Sand = dry mortar × sand parts ÷ (1 + sand parts).

Example: a one-brick wall 10 m long and 3 m high, in modular bricks, is 30 m² × 0.2 m = 6 m³. That takes 3,000 bricks. The bricks fill 4.62 m³, leaving 1.38 m³ of mortar, or 1.84 m³ dry. At 1 : 6, that is about 7.6 bags of cement and 1.58 m³ of sand, before wastage.

The wall thickness here includes one mortar joint, as the count needs it: one brick is brick length + joint, and half a brick is brick width + joint.

Questions people ask