Block Quantity Calculator | Quantitiy Surveying

Block Quantity Calculator for Wall

Developed By: Mohan Dangi (Gold Medalist)

This calculator helps civil engineers, contractors, quantity surveyors, and students calculate the number of blocks required for masonry walls after deducting door and window openings.

Formula Used

Gross Wall Area:

Wall Area = Length × Height

Opening Area:

Opening Area = Width × Height

Net Wall Area:

Net Wall Area = Gross Wall Area − Total Opening Area

Number of Blocks:

Number of Blocks = Net Wall Area / Block Face Area

Wall Details

Wall Length (m)

Wall Height (m)

Block Details

Block Length (mm)

Block Height (mm)

Wastage Percentage (%)

Opening Details (Doors / Windows)

Number of Openings

Total Opening Width (m)

Total Opening Height (m)

Enter combined dimensions of all openings. Example: If there are 2 windows each of 1.2m width, enter total width = 2.4m

Results will appear here.

Common Block Sizes

Block Type	Size (mm)
Concrete Block	400 × 200 × 200
AAC Block	600 × 200 × 200
Fly Ash Block	230 × 110 × 75
Hollow Block	400 × 200 × 150

© 2026 | Designed and Developed by Mohan Dangi (Gold Medalist)