Permeable Paver Calculator

Gardening • Drainage • Materials

Design clean drainage surfaces that protect garden soil. Get quantities for pavers, stone, and edging. Export results as files and build with confidence today.

Calculator
Enter project geometry, paver size, layers, and optional costs.
Choose how you will enter dimensions and densities.
Custom area skips perimeter-based edging.
Typical: 5–10% for cuts and breakage.
Enter radius, not diameter.
Use a measured plan or mapping tool.
Use 0 for tight fit, or typical joint width.
Depth of joint stone above bedding layer.
Typical open-graded aggregate: 30–40%.
Used for weight and cost estimates.
Edging reduces spreading and maintains joints.
Add unit costs to estimate totals.
Results will appear above this form.
Cost Inputs
Fill only what you want to include.
Currency is display-only; enter values in your preferred currency.
Example Data Table
Reference scenarios for quick planning.
Scenario Area Paver Size Base Estimated Pavers Base Volume
Garden patio (rectangle) 120 sq ft 8×4 in 6 in ~540 ~2.7 cu yd
Walkway (rectangle) 60 sq ft 6×6 in 4 in ~260 ~0.7 cu yd
Parking pad (rectangle) 200 sq ft 8×8 in 8 in ~450 ~4.9 cu yd
Examples assume ~7% waste and a simple grid layout.
Formula Used
Core calculations behind quantities and storage.
  • Area: Rectangle A = L × W, Circle A = πr².
  • Perimeter: Rectangle P = 2(L+W), Circle P = 2πr.
  • Pavers: N = (A / A_module) × (1 + waste), rounded up.
  • Module area: A_module = (paver + joint)_L × (paver + joint)_W.
  • Layer volume: V = A × thickness.
  • Joint fraction: f = 1 − (A_paver / A_module).
  • Joint volume: V_joint = A × joint_depth × f.
  • Base storage: V_storage = A × base_thickness × void_ratio.
How to Use This Calculator
A quick workflow that matches typical site planning.
  1. Select your unit system and choose a shape.
  2. Enter project size, then enter paver and joint dimensions.
  3. Set layer thicknesses for base, bedding, and joint depth.
  4. Adjust waste and void ratio for your build conditions.
  5. Optional: turn on cost estimator and fill unit costs.
  6. Press Submit to view results above the form.
  7. Download CSV or PDF to share with suppliers or crews.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.