ConcreteCalculatorHQ

Rebar Calculator

Estimate a simple rebar grid for rectangular slabs. Enter slab dimensions and bar spacing to get total bars, linear feet, and weight.

Calculator inputs

Estimate a simple rectangular rebar grid from slab dimensions and spacing.

Rebar Estimate
220.0 linear ft
147.0 lb approx. weight

How to use this calculator

  1. 1. Enter slab size
    Use the finished length and width of the rectangular area.
  2. 2. Set spacing and size
    Common grid spacing is 12 or 16 inches, depending on the project.
  3. 3. Review totals
    Use bar counts, linear feet, and weight as planning estimates.

Quick checks

10 x 10 slab at 12 inches
Quickly estimates both grid directions and total linear feet.
Weight check
Switch between #3, #4, and #5 to compare approximate material weight.