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`"brick/block/stone count" = ( "length" * "height" )/ (( "bh" + "mj" ) * ( "bl" + "mj" ))`

Enter a value for all fields

The **Variable Sized (brick, block or stone)** calculator computes the number of bricks, blocks or cut stone needed for a wall using any uniformed size brick, block or stone.

**INSTRUCTIONS:** Choose units and the following:

- (
**l**) Length of the wall - (
**h**) Height of the wall - (
**b**h) Brick, Block or Stone height. - (
**bl**) Brick, Block or Stone length. - (
**mj**) Mortar Joint thickness. In the U.S., it's often 3/8" and 10mm in Europe. - (
**M**) Choose whether to add margin to the count estimate. Otherwise, the algorithm assumes all fractional bricks and blocks are used. The default is YES, because it is better to have a few too many bricks or blocks on the site than waist time waiting for more to come.

**Number of Brick, Block or Stone (n):** The calculator returns the number of masonry units needed to wall.

**Note:** The wall height (h) and length (l) are in meters and the brick/block units are millimeters. However, other units are available via the pull-down menu for the inputs (e.g. inches, feet, yards).

**Also Note:** The sizes for the brick and block in the U.S. include a mortar joint (mj) of 3/8". Therefore, enter a mortar joint equal to zero, if using the standard American brick or block sizes.

The** Variable Sized (brick, block or stone) **equation calculates the number of brick, block or cut stone needed for a wall based on the dimensions of the wall and the size of the brick, cut stone or block. This calculation is for a wall or fascia wall which implies that wall is one unit (brick, block or stone) deep. The user identifies the height and length of the wall and enters the dimensions of the masonry unit. vCalc will then calculate the number of units needed for the wall. The graphic shows a straight wall. However, the length can be provided for a circular or other-wised curved or serpentine wall, and the calculation should be accurate.

To do this, vCalc calculates the area of a wall and then uses the dimensions of brick, block or stone to determine how many units are needed for the construction of the wall. This is an ESTIMATION, and actual number of units needed may vary based on the thickness of the mortar joints and other factors. Nonetheless, this formula does take into account a nominal mortar joint. The ADD MARGIN option is a more conservative method. While one ideally would like to precisely pre-order and purchase the exact amount, it is better to have a small excess of materials that can be returned after the job, than to halt construction in order to acquire additional materials. This latter case is both frustrating and costly.

Brick and block walls are used in many applications, ancient to modern. They can be found in homes, building, and gardens. They can also be seen in general landscaping as retention walls.