Masonry (Concrete, Brick and Block)

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Calculator / Last modified by KurtHeckman on 2017/10/10 14:38
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The Masonry Calculator contains equations and data used in working                  Rectangular Slab Circular Slab 5 sided polygon (pentagon) slab DIFFERENT SLAB SHAPES  with concrete slabs, walls and piers and footers, bricks, blocks and concrete walls. The formulas in this calculator are generally used to calculate materials needed for slabs of different shapes (e.g. rectangular, circular, or polygons), masonry walls made of poured concrete, brick or block, and columns and peers.    It also includes a calculator to compute the delivery cost of bulk concrete.  For more comprehensive rebar (reinforcement bar) calculations, see the Rebar Calculator.

The SLABS tab has the following formulas: (Click on any name)

• Cubic Yards in a Rectangle Slab: This computes the volume of concrete in a rectangular shaped slab.
• Square Feet of a Rectangle Slab: This computes the surface area of rectangular shaped slab.
• Length of Rebar in a Rectangle Slab: Computes the length of rebar in a rectangular shaped slab.
• Weight of Rebar in a Rectangle Slab: Computes the weight of rebar in a rectangular shaped slab.
• Weight of Concrete by Cubic Yards:  This computes the weight of any volume of concrete.
• Price of Delivered Concrete (mileage, material, pumping): Computes the delivered price of concrete as a function of the bulk rate, pumping costs and the mileage to the site.
• Cubic Yards in a Circular Slab: Computes the volume of a circular slab
• Square Feet of a Circular Slab: Computes the surface area of a circular slab.
• Perimeter of a Circular Slab by Radius: Computes the perimeter of a circular slab based on the radius (r).
• Perimeter of a Circular Slab by Area:  Computes the perimeter of a circular slab based on the Area (A) of the slab. Masonry Wall (brick, block or poured concrete)
• Cubic Yards in a Polygon Slab: Computes the volume of a polygon slab (e.g. hexagon).
• Square Feet of a Polygon Slab: Computes the surface area of a polygon (e.g. octagon) slab.
• Length of the Perimeter of a Polygon Slab: This computes the perimeter of a polygon slab (e.g. pentagon).
• Length of one Side of a Polygon Slab: This computes the appropriate length of one side of a polygon slab.

The Walls, Footers and Columns(piers) tab has the following formulas:

• Brick or Blocks in a Wall (U.S.A.): This computes the number of standard U.S. brick or block needed for a wall using feet and inches.
• Brick or Blocks in a Wall (Europe): This computes the number of standard European brick or block needed for a wall using meters and centimeters.
• Brick or Blocks in a Wall (custom): This computes the number of brick or block needed for a wall with user designated (variable) block dimensions including the mortar joint.
• Square Feet of Forms for a Wall: This computes the surface area for the forms needed when pouring a concrete wall (e.g. basement foundation wall).  It lets the user choose the surface area on one side, two sides, or two sides and the edges to provide the complete surface area needed for forms.
• Cubic Yards in a Concrete Wall: This computes the volume of concrete in a concrete wall.
• Cubic Yards in a Footer: This computes the volume of concrete in a footer base on the footer depth, length and width.
• Cubic Yards in a Footer (based on cross-section area): This computes the volume of concrete in a footer based on the footer's cross-section area.
• Cubic Yards in a Column (pier): This computes the volume of a circular concrete pier or column.

Other Information:

Weight of concrete:

• Cubic Feet in a 40lb bag of concrete mix (e.g. Quikrete) = 0.3 ft3
• Cubic Feet in a 60lb bag of concrete mix = 0.45 ft3
• Cubic Feet in an 80lb bag of concrete mix = 0.6 ft3
• Weight of a cubic foot of Concrete = 145 lbs/ft3
• Weight of a cubic yard of Concrete = 1.9575 tons/yd3

Guidelines for Depth of Concrete Slabs

Always consult local building codes for the best answer.  However, a guideline for the  depth of concrete is as follows:

4” - Home basement floors, farm building floors
4”-5” - Home garage and porches
5”-6” - Sidewalks, barn and granary floors, small sheds
6”-8” - Driveways

History

The term rebar is short for reinforcement bars, and refers to bars of steel embedded in concrete to improve tinsel strength.