Calculate how plenty of concrete blocks and also bags of mortar are required for your job by start your wall dimensions and block size. Add the block price to acquire an approximated material price estimate.

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Concrete blocks space an affordable structure material that have the right to be used for many construction projects and are suited very well for building and construction walls for foundations or energy buildings.

Concrete blocks typically have holes in the facility to mitigate the weight, the product needed, and the cost. The average concrete block is created of cement and also coal ash, i beg your pardon is why they room often called cinder blocks.


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Concrete blocks are concrete stonework units, or CMUs,<1> however we frequently refer come them together concrete blocks or cinder blocks.

You could be here due to the fact that you’re wondering how numerous concrete block you’ll require for your project.


Keep reading to learn the process to calculation the number of concrete blocks you need, or simply use the calculator above. Simply go into the dimensions of your wall surface project, and the concrete block calculator will number out how plenty of blocks friend need.

Note: Retaining walls space a bit different from a typical concrete block wall. If you’re building a retaining wall, then try our retaining wall surface calculator.

How to calculation Concrete Blocks

There are several formulas to figure out how numerous concrete blocks are important for a wall surface project, yet you’ll need to start by measuring the wall’s width and height in feet.

Step One: Find wall Square Footage

Once you have the wall measurements, calculation the square footage by multiplying the width times the height.

wall sq ft = broad × height

Step Two: discover Block Square Footage

Now you require to figure out the square clip of the block you space using. The standard block size is 16″ large x 8″ high. Multiply 16×8, and then division by 144 to acquire the answer.

block sq ft = 16 × 8144 = 0.89 sq. Ft.


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Different size blocks will have various square footages; use the formula over to uncover the solution. Check out ours square footage calculator to identify the square clip of her block.

Step Three: calculate Blocks

After you have found the square clip of both your wall surface and your block, identify the variety of blocks you need is as straightforward as splitting the wall square footage by the block square footage.

blocks = wall sq ftblock sq ft


If you’re making use of a typical 16″ x 8″ x 8″ block, uncover the number of blocks needed by splitting the wall surface square footage by 0.89.

blocks = wall surface sq ft0.89


We recommend including 5%-10% additional blocks come account for broken blocks or block that have to be reduced for the edges.

Our calculator over may suggest a different quantity of block needed since it offers a more precise formula, accounting for partial blocks and cutoffs automatically.

How to calculation Mortar for a Block Wall

Calculating the amount of mortar essential for the joints in a concrete block wall surface will vary depending on the mortar mix girlfriend use. ~ above average, it takes about three bags of cement for every 100 blocks.

Divide the number of blocks being mounted by 33.3 to calculation how countless bags room needed. Traditional mortar calls for a 1:3 cement to sand mix, which amounts to 1 yd3 that sand because that every seven bags of cement.

You can likewise purchase pre-mixed bags that mortar, which usually yield roughly 12 blocks per 80-pound bag. Shot our mortar calculator to calculation how plenty of bags space needed.

How to estimate Grout or Concrete Fill

Estimating the concrete required to to fill the voids in concrete block involves finding the volume the the void in the block being used and also multiplying the by the variety of voids in the wall. Measure the length, width, and height that the void in inches, climate multiply to acquire the void’s cubic inches.

Multiply the cubic inches by the variety of voids in the wall, generally 2 per block. Finally, division cubic inches by 46,656 to find cubic yards of concrete needed.

Use our block to fill calculator to estimate the to fill volume.

Tools required to download a Concrete Block Wall

If you’re installation a concrete block wall, you will need several devices to correctly execute the job. Right here is a tiny list of tools that are vital to develop a wall.

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Standard Concrete Block Sizes

You’ll need to understand the dimension of the concrete block you will do it be making use of to recognize how numerous blocks you require for your project. The most common sizes space 8″ high by 8″ wide and 8″ high through 16″ broad in varying thicknesses.

The block’s thickness is not vital to detect how numerous blocks you need, yet it is important when estimating how much mortar and other masonry material you need. The usual thicknesses space 4″, 6″, 8″, 10″, 12″, and 14″.

Refer come the tables listed below for standard block sizes, including the in the name of dimensions. The nominal size is the block’s really size, while the size contains a 3/8″ mortar joint and is the size that should be offered when estimating material.

The conventional mortar joint should be 3/8″ special for your wall.

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2″ and 3″ CMU Block Dimensions

Chart showing the size of traditional 2″ and 3″ blocks and also the variety of blocks necessary per 100 sq ft of wallSize D x H x WNominal D x H x WBlocks every 100 ft2
2″ x 8″ x 16″1 5⁄8” x 7 5⁄8” x 15 5⁄8“113
3″ x 8″ x 16″2 5⁄8” x 7 5⁄8” x 15 5⁄8“113

4″ CMU Block Dimensions

Chart mirroring the size of standard 4″ blocks and also the number of blocks necessary per 100 sq ft of wallSize D x H x WNominal D x H x WBlocks every 100 ft2
4″ x 8″ x 8″3 5⁄8” x 7 5⁄8” x 7 5⁄8“226
4″ x 8″ x 16″3 5⁄8” x 7 5⁄8” x 15 5⁄8“113

6″ CMU Block Dimensions

Chart reflecting the size of typical 6″ blocks and also the number of blocks required per 100 sq ft the wallSize D x H x WNominal D x H x WBlocks per 100 ft2
6″ x 8″ x 8″5 5⁄8” x 7 5⁄8” x 7 5⁄8“226
6″ x 8″ x 16″5 5⁄8” x 7 5⁄8” x 15 5⁄8“113

8″ CMU Block Dimensions

Chart showing the size of standard 8″ blocks and also the variety of blocks required per 100 sq ft of wallSize D x H x WNominal D x H x WBlocks every 100 ft2
8″ x 8″ x 8″7 5⁄8” x 7 5⁄8” x 7 5⁄8“226
8″ x 8″ x 16″7 5⁄8” x 7 5⁄8” x 15 5⁄8“113

10″ CMU Block Dimensions

Chart reflecting the dimensions of traditional 10″ blocks and the number of blocks required per 100 sq ft that wallSize D x H x WNominal D x H x WBlocks every 100 ft2
10″ x 8″ x 8″9 5⁄8” x 7 5⁄8” x 7 5⁄8“226
10″ x 8″ x 16″9 5⁄8” x 7 5⁄8” x 15 5⁄8“113

12″ CMU Block Dimensions

Chart showing the size of traditional 12″ blocks and also the number of blocks necessary per 100 sq ft that wallSize D x H x WNominal D x H x WBlocks every 100 ft2
12″ x 8″ x 8″11 5⁄8” x 7 5⁄8” x 7 5⁄8“226
12″ x 8″ x 16″11 5⁄8” x 7 5⁄8” x 15 5⁄8“113

14″ CMU Block Dimensions

Chart showing the dimensions of traditional 14″ blocks and the variety of blocks needed per 100 sq ft the wallSize D x H x WNominal D x H x WBlocks per 100 ft2
14″ x 8″ x 8″13 5⁄8” x 7 5⁄8” x 7 5⁄8“226
14″ x 8″ x 16″13 5⁄8” x 7 5⁄8” x 15 5⁄8“113

How lot Does a Block wall surface Cost?

A wall surface typically expenses $10 – $15 to install; learn much more about a wall surface project’s expense factors. Us suggest acquiring several professional approximates to gain the best labor cost and find the right company for your project.