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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

**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)**

**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

# Concrete Calculations and Estimating