Brick Mortar Calculator

Calculator

Wall length (m) *

Wall height (m) *

Wall thickness (m) *

Example: 0.115 m for half-brick thickness.

Openings area (m²)

Total doors/windows area to subtract.

Wastage (%) *

Brick length *

Brick width *

Brick height *

Brick unit *

Joint thickness *

Joint unit *

Dry volume factor *

Typical range: 1.25–1.40.

Mix ratio cement part *

Mix ratio sand part *

Example: 1:6 for plaster mortar.

Cement density (kg/m³) *

Bag size (kg) *

Water-cement ratio *

Used only for mixing water estimate.

Formula used

The model estimates mortar by subtracting brick solid volume from brickwork volume, using modular brick size (brick + joint) to estimate brick count.

NetArea = (Length · Height) − OpeningsArea
WallVolume = NetArea · Thickness

Vmod = (Lb + j) · (Wb + j) · (Hb + j)
Bricks ≈ WallVolume / Vmod

Vbrick = Lb · Wb · Hb
WetMortar = max(0, WallVolume − Bricks · Vbrick)
DryMortar = WetMortar · DryFactor · (1 + Waste%)

CementVol = DryMortar · (CementPart / (CementPart + SandPart))
SandVol = DryMortar − CementVol
CementMass = CementVol · ρcement
Bags = CementMass / BagSize
WaterLiters ≈ CementMass · (w/c)

How to use this calculator

Enter wall length, height, and thickness in meters.
Subtract doors and windows using total openings area.
Provide brick dimensions and select their unit.
Set joint thickness to match site workmanship.
Choose dry volume factor and wastage percentage.
Enter the mortar mix ratio, cement density, and bag size.
Press Submit to view results above the form.
Download CSV or PDF for quick site reporting.

Example data table

Wall (m)	Thickness (m)	Openings (m²)	Brick (mm)	Joint (mm)	Mix	Dry factor	Waste (%)	Dry mortar (m³)	Cement bags
5 × 2.8	0.115	0.0	190×90×90	10	1:6	1.33	5	0.1003	0.38

Example values are illustrative; adjust for your local brick sizes.

Calculator

Formula used

How to use this calculator

Example data table

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