Rebar in a Circular Slab

The Rebar in a Circular Shaped Slab calculator estimates the total length and weight of reinforcement bars (rebar) needed for a circular shaped concrete slab.

INSTRUCTIONS: Choose units and enter the following:

  • (r) Radius of Circular Slab (e.g. 12 ft).
  • (D) Depth of Slab (e.g. 6″)
  • (i) Inset from the edge of the circular slab (e.g. 3 inches)
  • (oCon-center spacing of the rebar.
  • (rS) Rebar Size
  • (LF) Lapping Factor
  • (M) Number of rebar mats
  • (rL) un-cut Rebar Length
  • (WL) Output choice:  Choose rebar weight or length

Weight and Length of Rebar in a Circular Slab: The calculator returns the:

  • Length of rebar in feet
  • Weight rebar in pounds
  • Surface Area of Slab in square feet
  • Total Volume of the Slab in cubic yards
  • Volume of Concrete in cubic yards
  • Concrete Displaced by Rebar in cubic yards 

However, these can be automatically converted to compatible units (e.g. meters or kilograms) via the pull-down menu.