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Rebar Calculator

Enter your slab's dimensions and grid spacing to calculate the total rebar length and number of standard sticks needed.

How to use this tool

  1. 1Enter your slab's length and width in feet.
  2. 2Enter your reinforcement grid spacing in inches on-center.
  3. 3Enter the standard rebar stick length sold at your supplier.
  4. 4See total sticks needed and estimated cost.

Frequently asked questions

Does this tell me what spacing or bar size to use?+

No — spacing and bar size (like #3 or #4 rebar) should come from your local building code, engineer, or project spec; this tool only converts a spacing you choose into a materials estimate.

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