Crack Width Calculator
Calculate crack widths in reinforced concrete beams and slabs per ACI 318 requirements.
Section Parameters
in
in
ksi
Service load stress in reinforcement (typically 0.6fy)
in
in
Calculated Crack Width
7.15 mils
0.18 mm | Allowable: 16.00 mils
Utilization
44.7%
Beta Factor
1.140
Max Spacing
20.0"
dc
2.31"
Crack Width: OK
w = 7.15 mils vs w_allow = 16.00 mils
Bar Spacing: OK
s = 6" vs s_max = 20.0"
Crack Width Limits:
Interior Exposure16 mils (0.4 mm)
Exterior Exposure13 mils (0.3 mm)
Severe Exposure10 mils (0.25 mm)
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.