How does the Rebar Spacing Calculator work?

Minimum spacing typically 1.5× bar diameter or 40 mm, whichever is larger Then: Account for aggregate size (spacing > 1.3× max aggregate diameter) Then: Calculate based on cover requirements and member width.

Can you give an example of how to use the Rebar Spacing Calculator?

Example: Input #25 rebars (25 mm), clear cover 50 mm, beam width 400 mm gives a result of Maximum ~4 bars fit with 50 mm spacing (Detailed calculation).

Is the Rebar Spacing Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Rebar Spacing Calculator?

Our Rebar Spacing Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Rebar Spacing Calculator

Bar Diameter (in)

Number of Bars

Concrete Width (in)

Reinforcement bar spacing determines concrete coverage and structural capacity. Adequate spacing ensures proper concrete consolidation and strength.

Difficulty:intermediate

References

›Rebar Spacing — Wikipedia

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Rebar Spacing Calculator

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Rebar Spacing Calculator