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Calculating the Number of Block Quantity
- Add the total Linear FT of walls to be blocked.
- Multiply the total Linear FT by the Height of the building to find the Area to be Blocked.
- Minus the total square feet of all openings.
Multiply the area by 1.125.
Example: Calculate the block needed for a wall that is 50' long and 10' High. With 80 sq feet of openings.
- 50' X 10' = 500 SF
- 500 - 80 = 420
- 420 X 1.125 = 473
Block Multiplier
- Add 3/8" Mortar joint to block dimensions = 16" X 8"
- 16" X 8" = 128"
- 144 / 128 = 1.125 (144 is the square inches in a square foot) 1.125 Blocks per SF.
Concrete Masonry Units (Blocks)
Concrete Columns: Multiply the Height of your column by the number that corresponds to the diameter to determine the cubic yards needed.
Pythagorean Theorem is often used for squaring. To verify a corner is square (90 Degrees)
Pythagorean Theorem
Calculating a Concrete Slab
- Multiply Length by the Width to determine area.
- Multiply the area by the depth (Make sure the depth has been converted from inches to feet) to determine cubic feet.
- Most concrete is ordered by the "yard" (or cubic yard) so you must now divide the cubic feet by 27.
Example: Calculate the cubic yards of concrete for a driveway that is 12' wide, 100' long and will be poured to an average depth of 4"
- 100 X 12 = 1200
- 1200 X .33 = (4" ÷ 12 = .33)
- 396 ÷ 27 = 14.67