4 Online Concrete Rebar Calculator Free Websites

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Here is a list of 4 free online concrete rebar calculator websites. These websites help you check number of rebars (or reinforcing steel which is used as rods) needed for concrete slab. You will be able to enter input details such as slab width and height, grid spacing, waste percentage (if required), edge clearance, etc., based on the details provided by website, and then you can get the results.

The results will show number of rebars needed, grids, grid spacing, total rebars length, and more. Some websites have unique features also. For example, you can see the graph for concrete rebar calculation, check total estimated cost for rebars, etc.

Let’s check these free concrete rebar calculator websites one by one.


Blocklayer.com website

Blocklayer.com is one of the best websites for concrete rebar calculation. It lets you calculate rebar spacing, its layout, and weight of rebar in a concrete slab. The unique feature of this website is it also creates a graph automatically for rebar calculation.

You can add:

  • Exact bar spacing.
  • Bar length and width.
  • Exact or equal spacing.
  • Bar size.
  • Edge clearance.
  • Waste/overlap.
  • Slab thickness.
  • Output (in feet or Inches).

After adding the details, use the available Calculate button. This will generate the output graph where you can see grid, spacing, and other details.


Inchcalculator.com website with rebar material calculator

Inchcalculator.com brings a simple but useful rebar material calculator. Here is the link. You can add concrete slab width n height, edge clearance, and grid spacing, and then get the results.

The results are visible just below the input details so that it will be very easy for you to check output and input details together. The results show material estimate (number of rebars needed), equal spacing (length and width), and grid size. It doesn’t come with any graph or other options. But, the available options are good enough.

Omni Calculator

Omni Calculator

Omni Calculator (Homepage) is also a useful website to calculate number of rebars needed for creating reinforcement in the concrete slab. You can add:

  • Slab dimensions: width and height (in meter, centimeter, feet, inches, yards, etc).
  • Spacings: edge-grid and rebar-grid.
  • Length of a single rebar.
  • Wire price, etc.

Once you have added the details, you will get the result. The output will show number of rebar pieces, grid length and width, total rebars length, and cost of rebars.

The website has a user-friendly interface so you won’t face any trouble while using this concrete rebar calculator.



Spikevm brings a very simple concrete reinforcement calculator for slabs. You can enter input details like length (in feet and inches), width, grid spacing, required splice of your bars, and waste factor (in percentage, if needed). When the details are added, hit the Calculate button.

The result will show total amount of rebar needed in lineal feet, amount of waste factor that will be added, total lineal feet of rebar including amount of waste, etc.

We’ve also covered hip roof framing websites for you.

The Conclusion:

Here I close this list which has good online concrete rebar calculator websites. In my view, the first website is more useful than others because it generates graphs and lets you enter more details than other online concrete rebar calculators. You can still try out all these sites, and then start using the most useful website.

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