Concrete Hollow Blocks are used for a variety of purposes and are classified as load-bearing and non-load bearing blocks. Local hardware stores usually have a variety of 3 commercially-available CHBs – 4”, 6”, 8”.

The easiest way to estimate CHB quantity is by the Area Method. A piece of standard concrete hollow block (CHB) has a surface area of 0.08 m^{2}. In accordance to this, a one square meter area will require 12.5 pcs of CHB.

- Determine your initial wall area:
- Determine door and window areas:
- Get your total wall area:
- Multiply your total wall area by 12.5, the number of pieces needed for a 1m
^{2}wall:

Determine the area of your wall. The formula for a square wall is Length * Height.

Make sure to take into consideration the often overlooked information that will affect the area of your wall – for example, the depth of your beam or the underground foundation CHB.

Determine if there are any openings in your wall – e.g. windows or doors. If there are, get the total area of the openings.

Subtract your total openings with the initial area of your wall.

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Compute for the quantity of 4” concrete hollow blocks (CHB) needed for a wall that is 3 meters high and 2 meters long.

- Determine your initial wall area:
- Determine door and window areas:
- Get your total wall area:
- Multiply your total wall area by 12.5, the number of pieces needed for a 1m
^{2}wall:

** Square Wall Area ** = Length * Height

= 2m * 3m

** = 6m ^{2} **

** There are no specified doors or windows. **

** Total Wall Area ** = Initial Wall Area – Total Wall Opening Area

= 6m^{2} – 0m^{2}

** = 6m ^{2} **

** No. of CHB ** = 6m^{2} * 12.5

** = 75 pcs. of CHB **

Compute for the quantity of 8” concrete hollow blocks (CHB) needed for a wall that is 3 meters high and 5 meters long with a door that is 2.1 meter high and 0.6 meter wide and a window that is 0.6 meter wide and 1 meter high.

- Determine your initial wall area:
- Determine door and window areas:
- Get your total wall area:
- Multiply your total wall area by 12.5, the number of pieces needed for a 1m
^{2}wall:

** Square Wall Area ** = Length * Height

= 5m * 3m

** = 15m ^{2} **

** Door Area ** = 2.1m * 0.6m

** = 1.26m ^{2} **

** Total Wall Area ** = Initial Wall Area – Total Wall Opening Area

= 15m^{2} – 1.86m^{2}

** = 13.14m ^{2} **

** No. of CHB ** = 13.14m^{2} * 12.5

= ** 164.25 pcs of CHB
~ 165 pcs. of CHB **

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