What is minimum clear spacing between rebars?

ACI 318 25.2: minimum clear spacing ≥ d_b (bar diameter), 1.33 times maximum aggregate size, and 25mm (1 inch). This ensures concrete can be consolidated around bars without honeycombs.

What temperature and shrinkage reinforcement is required?

ACI 318 Table 24.4.3.2: minimum A_s = 0.0018bh for Grade 420 deformed bars. Maximum spacing = min(5h, 450mm). Grade 420 WWR (welded wire): A_s = 0.0014bh.

How do I calculate bar area for a given spacing?

A_s per unit width = (A_bar / spacing) × 1000 mm. For #4 bar (d=12.7mm, A=127mm²) at 200mm spacing: A_s = 127/200 × 1000 = 635 mm²/m. Compare to required A_s from flexural design.

Rebar Spacing Calculator

Calculate minimum rebar spacing per ACI 318: max(d_b, 1.33×agg, 25mm). Maximum spacing for temperature steel: min(5h, 450mm). Crack control spacing: s ≤ 380(280/f_s) - 2.5c_c (ACI 318-14). Bar area vs spacing.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the patient or scenario you are assessing. Calculate minimum rebar spacing per ACI 318: max(d_b, 1.33×agg, 25mm). Maximum spacing for temperature steel: min(5h, 450mm). Crack control spacing: s ≤ 380(280/f_s) - 2.5c_c (ACI 318-14). Bar area vs spacing. Use the rebar spacing result to inform your clinical assessment.

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Frequently Asked Questions

What is minimum clear spacing between rebars?

What temperature and shrinkage reinforcement is required?

How do I calculate bar area for a given spacing?