Concrete Crack Width Calculator
Estimate expected crack width based on reinforcement, concrete cover, and tensile strain
Common values: 12mm, 16mm, 20mm, 25mm
Center-to-center distance between bars
Distance from bar surface to concrete surface
Typical range: 0.0005 – 0.003
Depends on bond properties (0.8-1.4)
0.00
Crack Width (mm)
Expected maximum crack width
Interpretation of Results
Enter your values and click “Calculate” to see results.
Industry Standards Reference
- ACI 224R-01: Recommended crack width limits: 0.33mm (exterior) to 0.41mm (interior)
- Eurocode 2: Typical limit: 0.3mm for reinforced concrete under quasi-permanent loads
- BS 8110: Suggests 0.3mm limit for normal environments
About This Calculator
This calculator estimates crack width in reinforced concrete members using the formula from Eurocode 2 (EN 1992-1-1). The calculation considers the bond properties between concrete and reinforcement, strain distribution, and geometric parameters.
Formula Used
wk = k × sr,max × εsm
Where:
- wk = Crack width (mm)
- k = Coefficient (depends on bond properties)
- sr,max = Maximum crack spacing (mm)
- εsm = Mean strain in reinforcement