Brick & Block Calculator — Wall, Fence & Mortar Estimator

Order settings

Applies to every calculator below.

Wastage buffer

Mortar bag size

Brick wall

Wall size and brick dimensions. Openings are subtracted automatically.

Wall length

Wall height

Openings

m²

Wall type

Mortar joint

Brick size — defaults to NZ/AU standard (230 × 76mm face).

Brick length

Brick face height

Concrete block wall

Wall size and block dimensions. Openings are subtracted automatically.

Wall length

Wall height

Openings

m²

Wall type

Mortar joint

Block size — defaults to NZ standard (390 × 190mm face, NZS 3122). Width doesn't affect block count.

Block length

Block face height

Filling cores (reinforced wall)

Mortar mix

Work out cement and sand for a given volume of mortar, by ratio.

Mortar volume needed

m³

Mix ratio (cement : sand)

Not sure of your volume? Use the Brick or Block tab first — mortar volume shows in the results there.

Coursing

Work out how many courses a wall needs — handy for setting out openings and corners at the right height.

Wall height

Unit type

Mortar joint

Estimates only, based on typical NZ brick and block coverage rates (NZS 3122) and standard mortar yields — always confirm quantities with your supplier before ordering. Brick & Block Calculator is a free tool from Wiesner Enterprises NZ.