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)