Calculate how plenty of concrete blocks and also bags the mortar are needed for your task by start your wall dimensions and block size. Include the block price to obtain an approximated material price estimate.

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Concrete blocks are an affordable building material that deserve to be supplied for many construction projects and also are suited really well for building and construction walls for foundations or energy buildings.

Concrete blocks frequently have feet in the center to mitigate the weight, the material needed, and also the cost. The typical concrete block is written of cement and coal ash, which is why they space often dubbed cinder blocks.

Concrete blocks are concrete stonework units, or CMUs,<1> but we often refer to them together concrete blocks or cinder blocks.

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

Keep analysis to discover the process to calculation the number of concrete blocks you need, or simply use the calculator above. Simply go into the size of your wall project, and the concrete block calculator will figure out how numerous blocks girlfriend need.

Note: Retaining walls space a bit various from a common concrete block wall. If you’re building a retaining wall, then shot our retaining wall surface calculator.

## How to calculation Concrete Blocks

There are numerous formulas to figure out how numerous concrete blocks are necessary for a wall surface project, but you’ll should start by measure up the wall’s width and also height in feet.

### Step One: Find wall surface Square Footage

Once you have actually the wall surface measurements, calculation the square clip by multiply the broad times the height.

wall sq ft = broad × height

### Step Two: uncover Block Square Footage

Now you need to number out the square clip of the block you space using. The traditional block size is 16″ broad x 8″ high. Main point 16×8, and then division by 144 to obtain the answer.

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

Different size blocks will have different square footages; apply the formula above to find the solution. Check out our square footage calculator to determine the square clip of her block.

### Step Three: calculate Blocks

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

blocks = wall sq ftblock sq ft

If you’re utilizing a standard 16″ x 8″ x 8″ block, uncover the variety of blocks essential by dividing the wall surface square clip by 0.89.

blocks = wall sq ft0.89

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

Our calculator above may suggest a various quantity of blocks needed since it provides a much more precise formula, audit for partial blocks and also cutoffs automatically.

## How to estimate Mortar because that a Block Wall

Calculating the lot of mortar needed for the joints in a concrete block wall surface will vary depending upon the mortar mix you use. On average, it takes about three bags that cement for every 100 blocks.

Divide the number of blocks being set up by 33.3 to calculation how many bags are needed. Standard mortar needs a 1:3 cement come sand mix, which quantities to 1 yd3 that sand because that every seven bags the cement.

You can additionally purchase pre-mixed bags the mortar, which usually yield about 12 blocks per 80-pound bag. Try our mortar calculator to calculation how many bags room needed.

## How to calculation Grout or Concrete Fill

Estimating the concrete essential to to fill the voids in concrete block entails finding the volume the the void in the block gift used and multiplying the by the number of voids in the wall. Measure up the length, width, and also height of the void in inches, then multiply to acquire the void’s cubic inches.

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

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

If you’re installing a concrete block wall, friend will need several devices to correctly execute the job. Here is a small list of devices that are important to develop a wall.

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## Standard Concrete Block Sizes

You’ll require to understand the dimension of the concrete block you’ll be using to determine how countless blocks you need for her project. The most usual sizes room 8″ high by 8″ broad and 8″ high through 16″ large in differing thicknesses.

The block’s thickness is not vital to finding how numerous blocks girlfriend need, but it is necessary when estimating just how much mortar and also other masonry material you need. The typical thicknesses room 4″, 6″, 8″, 10″, 12″, and also 14″.

Refer come the tables listed below for typical block sizes, consisting of the nominal dimensions. The nominal size is the block’s really size, if the size includes a 3/8″ mortar joint and also is the dimension that have to be provided when estimating material.

The conventional mortar joint must be 3/8″ special for her wall.

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### 2″ and also 3″ CMU Block Dimensions

Chart showing the dimensions of typical 2″ and 3″ 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
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 dimensions of typical 4″ blocks and also the number of blocks necessary per 100 sq ft the 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 the number of blocks necessary per 100 sq ft of 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 mirroring the size of standard 8″ blocks and the variety of blocks needed per 100 sq ft that 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 size of traditional 10″ blocks and also the variety of blocks needed per 100 sq ft that wallSize D x H x WNominal D x H x WBlocks per 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 reflecting the size of typical 12″ blocks and also the variety of blocks necessary per 100 sq ft the wallSize D x H x WNominal D x H x WBlocks per 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 reflecting the dimensions of standard 14″ blocks and the number of blocks essential per 100 sq ft of wallSize D x H x WNominal D x H x WBlocks every 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 Cost?

A wall surface typically expenses \$10 – \$15 come install; learn an ext about a wall surface project’s expense factors. Us suggest gaining several professional estimates to acquire the best labor cost and also find the right firm for your project.