Permeable Paver Calculator — Units, Bedding and Base
Estimate paver units and open-graded aggregate volumes for a rectangular permeable pavement area using user-selected layer depths.
Compare up to three scenarios
Capture the current result, change one or more inputs, and see the options side by side. The first option becomes your baseline.
Your live calculator remains unchanged. Capture it only when you want a comparison point.
Save this estimate as a project section
Name rooms, roof planes, yard areas or other sections separately. CalcurHome will combine compatible results from this calculator on this device.
No account or personal information required. Data remains in this browser until you delete it or clear browser storage.
View all saved project estimatesWhat does the permeable paver calculator calculate?
Divide paved area by the manufacturer’s installed module coverage, including the designed joint or open-cell spacing, then add cutting waste and round up. Multiply project area by bedding and base depths for aggregate volume. Infiltration, overflow, subgrade, traffic loads, edge restraint, and local stormwater rules still govern design.
Permeable paver and aggregate formulas
Installed module pitch includes the unit plus its assigned joint or open-cell spacing, so the two pitch dimensions produce consistent coverage area. Layer depths convert to feet, then cubic-foot volumes convert to cubic yards.
How to measure for an accurate estimate
- Measure the finished permeable surface inside edge restraints and divide curved or irregular plans into simple shapes.
- Use the manufacturer’s published installed module coverage or pitch, including the designed joint or open-cell spacing.
- Enter compacted layer depths from the site-specific section, not loose delivery depth or a generic online detail.
- Map slopes, low points, utilities, foundations, trees, and the intended overflow route before fixing the pavement footprint.
Permeable backyard patio
A 20 ft by 12 ft patio uses an 8 in by 4 in installed module pitch, 2 in bedding, 8 in base, and 10% allowance.
The estimate is 1,188 pavers, 1.63 yd³ of bedding stone, and 6.52 yd³ of open-graded base.Before you purchase material
- Use pavers, joint stone, bedding stone, and base aggregate approved as one compatible permeable pavement system.
- Confirm pallet coverage, pattern quantities, color-lot availability, replacement units, and return policies before ordering.
- Keep open-graded aggregate protected from sediment contamination during delivery, storage, and construction.
- Budget for edge restraints, geotextile only where specified, observation ports, underdrains, overflow, and maintenance equipment.
Common questions
How deep should a permeable paver base be?
Base depth depends on subgrade infiltration, frost, rainfall storage, drainage configuration, traffic loading, aggregate properties, and local criteria. Eight inches is only an editable example, not a design recommendation. Obtain a site-specific pavement section before using the aggregate quantity for purchasing.
Do permeable pavers need special gravel?
Yes, permeable systems generally use clean, open-graded aggregates selected to provide void storage, drainage, stability, and compatible joints. Conventional dense-graded base with fines can block infiltration. Follow the paver system specification and locally accepted gradations rather than substituting similar-looking stone.
How much waste should I add for permeable pavers?
A simple rectangular field may need a modest allowance, while curves, borders, diagonal patterns, breakage, and color blending increase cuts and waste. Check pallet coverage and pattern-specific manufacturer guidance. Keep a small quantity of matching units for future repairs without inflating aggregate quantities unnecessarily.
Do permeable pavers prevent all stormwater runoff?
No. Performance depends on rainfall intensity, available reservoir storage, soil infiltration, maintenance, sediment loading, slope, and any underdrain or overflow. Large or repeated storms can exceed capacity. The system needs a safe overflow path and periodic surface maintenance to preserve infiltration.
Sources and reference standards
- U.S. EPA — Soak Up the Rain: Permeable PavementFederal overview of permeable pavement benefits, site considerations, and maintenance.
Use this result in a complete project plan
Yard drainage planner
A wet yard is a water-path problem before it is a gravel, pipe or pavement problem. Roof discharge, neighboring grades, compacted soil, irrigation leaks and high groundwater can create similar symptoms but require different responses. This guide organizes observations, elevations, contributing areas, outlet review and material estimates without presenting a generic trench as a universal drainage design.
Did this calculator help you make the next project decision?