Pervious Concrete Calculator
Calculate pervious concrete volume, infiltration rate, stormwater storage capacity, and runoff reduction compared to impervious surfaces.
Inputs
Results
Infiltration Rate (in/hr)
288
Handles Design Storm (1=Yes)
1
Concrete Volume (yd³)18.52
Storage Capacity (cu ft)100
Runoff Reduction59.88%
Storage (in/sq ft)1.2
Total Weight (lbs)60,000
Estimated Cost$11,000
Total Storage Gallons62.35
How to Use This Calculator
- Enter the total pavement area in sq ft and the slab thickness in inches (typically 5–8 in for pervious concrete).
- Set the void ratio percentage — typical pervious mixes range from 15–25%; higher voids increase infiltration but reduce strength.
- Enter the design rainfall intensity in inches per hour using your local 10-year storm data.
- Check Infiltration Rate (in/hr) against design rainfall; 'Handles Design Storm' (1=Yes) confirms adequacy.
- Use Runoff Reduction (%) to document stormwater credit for permitting and LEED calculations.
- Note the Concrete Volume (yd³) and Estimated Cost for budget planning.
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