COMMITTED TO SERVING HAMPTON ROADS NORFOLK - VIRGINIA BEACH - CHESAPEAKE - SUFFOLK - PORTSMOUTH - HAMPTON - NEWPORT NEWS

**USE THIS MENU TO LOCATE MORE TIPS FOR EVERYDAY MATH**

- Calculating for Contractors (Estimating Tips, Mark up & Gross Profit)
- Calculating Area & Volume for Geometric Shapes
- Calculating & Estimating Concrete Slabs & Masonry Blocks
- Calculating Brick, Concrete, Footers, and Mortar
- Calculating Paint & Wallpaper
- Calculating Roofs & Gables (Waste Factors, Felt, Shingles, Nails Etc.)
- Calculating Wall Studs, Drywall, Ready Mix, Tape, Joint Compound, Nails & Screws.
- Calculating Wall Tile & Floor Tile
- Calculating Stairs, Stair Runs, Risers & Stair Terminology
- Calculating Slopes, Soil, Fill Material, Excavation Tips & Color Code for Underground lines

**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.

**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