Crack Width Analysis Calculator

Serviceability crack width check using ACI 318-19 Frosch, Eurocode 2, and Gergely-Lutz — for beams, slabs, walls, and tension members

ACI 318-19 §24.3Eurocode 2 §7.3.4Three Methods ComparedTransparent Steps

Note: This tool calculates per ACI/DPT standards but does not replace review by the design engineer.

Width b (mm)

Depth h (mm)

Eff. Depth d (mm)

Bar Diameter

Number of Bars

Bar Spacing (mm)

Clear Cover (mm)

Clear cover to nearest tension bar surface

Load Type

Service Moment Ms (kN·m)

Unfactored service moment (not 1.2D+1.6L)

Exposure Class

Affects allowable crack width limit

Concrete Grade

Steel Grade

Building Code

Ready to Analyze

Enter section, reinforcement, and loading then click Analyze