How to Calculate Concrete Blocks Needed?

In United States, cinder or concrete block serve as economic building material and there is a wide range of construction application for many types of Residential, Public and industrial building. Due to sturdy and long lasting building material, architect and Engineer will recommended for house construction, retaining wall, security barriers etc and this is best choice.

Concrete blocks also known as Concrete masonry units or CMU or Cinder blocks or breeze blocks. For a concrete block wall, the number of blocks you will need will depend on the size of wall and wether it is single or double skin wall.

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Knowing the size of concrete block help in block wall calculation, cinder block must confirm to ASTM standard when fabricating, most commonly used, a standard size of cinder block is 16 inch long by 8 inch high by 8 inch depth, which is represented in inch as 8″×8″×16″ or in mm as 200 × 200 × 400 (depth × height× length). This is nominal size of standard cinder block, their actual size measures 3/8 inch or 10mm shorter, allowing for mortar joints, their actual size is 7 5/8″ × 7 5/8″ × 15 5/8″ or approx 190 × 190 × 390 in mm. Other sizes are also available given here —

Nominal size of 4″ full CMU or cinder block – 4″×8″×16″ or 100 mm × 200 mm × 400 mm
Nominal size of 6″ full CMU or cinder block – 6″×8″×16″ or 150 mm × 200 mm × 400 mm
Nominal size of 8″ full CMU or cinder block – 8″×8″×16″ or 200 mm × 200 mm × 400 mm
Nominal size of 10″ full CMU or cinder block – 10″×8″×16″ or 250 mm × 200 mm × 400 mm
Nominal size of 12″ full CMU or cinder block – 12″×8″×16″ or 300 mm × 200 mm × 400 mm

How to calculate number of concrete blocks in a wall?

Determine the length and height of the block wall such as length of the wall =10 feet and height of wall = 10 ft
Calculate the square footage of clock wall by multiplying length and height such as 10 ft × 10 ft = 100 sq ft
Calculate square footage of one block such as 16″× 8″ = 128 sq in ÷ 144 = 0.89 sq ft
Determining the number of blocks you will need by dividing the wall square footage by square footage of one concrete block, such as number of blocks = wall sq ft/ block sq ft, 100/ 0.89 = 112 nos blocks.
Add 5% – 10% additional blocks (5% of 112 = 6 nos, 112 + 6 = 118 nos blocks, thus you will need 118 blocks for 100 sq ft wall.

How many concrete blocks per cubic foot (CFT)

Calculate block wall cubic footage (10 ft × 10 ft × 0.66 ft = 66 cubic footage) :- measures length, height and thickness of block wall, suppose a block wall is 10 feet long by 10 feet high by 8 inch wide, volume of wall in CF = length × height × thickness = 10 ft × 10 ft × 0.66 ft = 66 cubic feet.

2. Calculate volume of block (16″× 8″ × 8″ = 1024 sq in ÷ 1728 = 0.59 cubic feet):- most commonly used, a standard size of concrete block is 8″×8″×16″, volume of one block in CF = length × height × thickness = 16″ × 8″ × 8″ = 1024 cubic inch, divide by 1728 to get 1024 ÷ 1728 = 0.59 cubic feet

3. determining the number of blocks you need (66 CF÷ 0.59 CF = 112 nos blocks):- determining the number of blocks you need by dividing the volume of block wall by cubic feet of one concrete block, such as number of blocks = volume of wall CF/ volume of block CF, 66/0.59 = 112 nos blocks

4. Add 5% – 10% additional blocks (5% of 112 = 6 nos, 112 + 6 = 118 nos blocks

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Process To Get Concrete Blocks Cost Estimate Report

Here I am going to share some steps to get your concrete blocks cost estimate report.

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