This calculator requires the use of Javascript enabled and capable browsers. This calculator is designed to give an approximate quantity of bags of mortar required for the possible options for a 3/8" mortar joint, based on your data entry. Enter the number of 8" x 2" x 4" bricks or 8" x 8" x 16" blocks needed for this job. All values are numeric. Click on Calculate and read the possible values. This quantity is approximate; even so, it is very accurate but cannot account for unknowns creating data error.