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Calcimator

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$11,000.00
Total Storage Gallons62.35
How to Use This Calculator
  1. Enter the total pavement area in sq ft and the slab thickness in inches (typically 5–8 in for pervious concrete).
  2. Set the void ratio percentage — typical pervious mixes range from 15–25%; higher voids increase infiltration but reduce strength.
  3. Enter the design rainfall intensity in inches per hour using your local 10-year storm data.
  4. Check Infiltration Rate (in/hr) against design rainfall; 'Handles Design Storm' (1=Yes) confirms adequacy.
  5. Use Runoff Reduction (%) to document stormwater credit for permitting and LEED calculations.
  6. Note the Concrete Volume (yd³) and Estimated Cost for budget planning.

How the result changes with Void Ratio (%)

Void Ratio (%)Infiltration Rate (in/hr)Handles Design Storm (1=Yes)
172451
223171
284031
334751

What each input means

Pavement Area (sq ft)
Total area of pervious concrete pavement
Thickness (in)
Pervious concrete thickness (typically 5-8 inches)
Void Ratio (%)
Percentage of voids in the mix (typical: 15-25%)
Design Rainfall (in/hr)
Design storm rainfall intensity for your region

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Pavement Area (sq ft) = 1000, Thickness (in) = 6, Void Ratio (%) = 20, Design Rainfall (in/hr) = 2 = 4 input(s) provided
  2. Calculate Infiltration Rate
    Infiltration Rate
    288 = 288
  3. Calculate Handles Design Storm
    Handles Design Storm
    1 = 1
  4. Calculate Concrete Volume
    Concrete Volume
    18.52 = 18.52
  5. Calculate Storage Capacity
    Storage Capacity
    100 = 100

Engine last updated . Checked against 1 independently-derived test — how we verify calculators.

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