TryBuildCalcSand-Set Patio Calculator (Flexible / Interlocking Installation)
Size your sand-set patio materials instantly.
🕒 Last updated: September 22, 2026
Inputs
Sand-Set builds up a base course, bedding sand, pavers/flagstone, and swept joint sand — held at the edges by a separate edge restraint.
Aggregate Base
ℹ️ICPI/CMHA cite 4 in as the minimum pedestrian patio base over well-drained soil. Step up to 6 in for clay-rich/poor-draining soil or a frost-prone climate.
Bedding Sand
ℹ️1 in is the standard bedding thickness — deeper loose sand can shift and settle unevenly.
ℹ️Bulk delivery is standard; bagged is only practical for a small patio.
Pavers
ℹ️Pedestrian-only thicknesses — no 80mm vehicular-rated tier, since a patio never carries vehicle loads.
ℹ️Running bond has the lowest cutting waste and works with any paver shape; herringbone and basket weave are designed for roughly 2:1 rectangular pavers.
Joint Fill
ℹ️Joint depth is set to your surface material's own thickness.
Geotextile Fabric & Edge Restraint
Standard practice between subgrade and base — prevents soil migration into the base.
Edge restraint is required for an interlocking sand-set system to perform correctly — pick "No" only if a suitable restraint already exists or will be quoted separately.
Cost
Pavers Needed
908
4 x 8 in (Standard Brick), Running Bond (Stretcher) — lowest waste
Aggregate Base Needed
4.59 tons
4" deep
Patio Area
192
sq ft (17.84 m²) — 16 x 12 ft
Installation Method: Sand-Set (Flexible / Interlocking) — Surface: Concrete Pavers
Aggregate Base
Quarry Process (QP) — US driveway base, 4" deep
Installed volume: 2.37 cu yd
Order volume (incl. 15% compaction + 8% waste): 2.944 cu yd
Weight: 4.59 tons
Bedding Sand
Concrete Sand (ASTM C33) — recommended for bedding, 1" deep
Order volume (incl. 10% waste): 0.652 cu yd
Weight: 0.989 tons
Pavers
4 x 8 in (Standard Brick)
Order area (incl. 5% waste): 201.6 sq ft
Pavers: 908
Joint Fill
Polymeric/joint sand, 0.125" wide
Volume (incl. 12% waste): 1.98 cu ft
Bags needed: 4 (~50 lb each)
Geotextile Fabric
Area (+10% overlap): 211.2 sq ft
Rolls needed (12.5 x 360 ft each): 1
Edge Restraint
Steel / Aluminum Edge Restraint — holds curves well, longest-lasting
Length needed: 56 linear ft
Assumptions Used
Rectangular residential patio, pedestrian loads only (never vehicular). Sand-Set: an aggregate base (15% compaction + 8% waste), a screeded bedding course (10% waste, no compaction since it is installed loose), swept-in joint sand (12% waste for repeated dry fill/compact passes), and a required edge restraint around the full perimeter to keep the interlocking system from spreading apart. 4 x 8 in (Standard Brick) concrete pavers are quantified by the order area (footprint plus your chosen Running Bond (Stretcher) — lowest waste pattern's own cut waste) divided by each paver's own footprint. This calculator computes material quantities only — it does not verify subgrade compaction adequacy, drainage slope, local frost-depth requirements, or structural design for an unusual soil or loading condition.
Approximate results for planning only. Verify with a professional.
Diagram simplified for clarity (not to scale) — layer band heights reflect relative thickness, not exact scale.
Looking for the verification checklist, reference tables, tips, or common mistakes?See the complete Patio/Paver Materials Calculator.
Why Sand-Set is the most common patio installation method
Sand-Set (flexible/interlocking) installation builds a patio in layers from the bottom up: a compacted aggregate base, a screeded bedding sand course, the pavers themselves, and swept-in joint sand — with edge restraint around the perimeter keeping the whole system from spreading apart under foot traffic over time.
This page defaults to a 16 x 12 ft patio (192 sq ft) with a 4 in aggregate base — the ICPI/CMHA-cited minimum for a pedestrian patio over well-drained soil. Edit the inputs above to match your own patio size and soil conditions.
Patio/Paver Materials Calculator Formula: How Is It Determined?
Your patio area, installation method, and surface material combine into a full material takeoff, with a different formula path for each branch of the sand-set/mortar-set x pavers/flagstone matrix.
Step 1 — Patio Area
Area = Length x Width
Entered directly as a single rectangle.
Step 2a — Sand-Set: Base Course
Base Volume = Area x Base Depth
Order Volume = Base Volume x (1 + 15% compaction) x (1 + 8% waste)
Base depth is a pedestrian-only figure (4-6 in) per ICPI/CMHA patio guidance — materially shallower than a driveway's vehicular-load base.
Step 2b — Mortar-Set: Concrete Slab
Slab Volume = Area x Slab Thickness (skipped entirely if mortaring onto an EXISTING slab)
Order Volume = Slab Volume x (1 + 5% waste)
A new slab is 4-6 in thick per CMHA mortar-set guidance; an existing, sound concrete patio can be used directly with no new slab material.
Step 3 — Bedding Course or Mortar Setting Bed
Sand-Set: Bedding Volume = Area x Bedding Depth x (1 + 10% waste)
Mortar-Set: Mortar Bed Volume = Area x Mortar Bed Depth x (1 + 10% waste), then Bags = Order Volume / Bag Yield
Bedding sand/stone dust is installed loose (no compaction allowance); a mortar bed is troweled to a nominal thickness and bagged in whole units.
Step 4a — Concrete Pavers
Order Area = Area x (1 + Layout Pattern Waste %)
Paver Count = Order Area / Paver Unit Area
Layout pattern waste ranges 5-13% depending on cut geometry — the same formula this site's Paver Driveway Calculator uses, since the underlying cutting-waste geometry doesn't change for pedestrian loads.
Step 4b — Natural Flagstone
Order Area = Area x (1 + 10% cutting/breakage waste)
Tons = Order Area x Thickness x Stone Density / 2000
Flagstone is quantified by WEIGHT, not a fabricated per-unit count — coverage-per-ton is derived directly from the stone's own density and thickness.
Step 5 — Joint Fill
Rectangular units: Volume per sq ft = 144 x (1/W + 1/L) x Joint Width x Joint Depth
Flagstone: Volume = Area x Joint Area Fraction x Joint Depth
Concrete pavers use exact rectangular joint geometry; flagstone's irregular joints are approximated as a fraction of surface area that scales with joint width (a standard simplification for irregular-stone jointing takeoffs).
Step 6 — Cost
Line Cost = Order Quantity (bags/tons/sheets/bars/sq ft, as actually purchased) x Unit Price
Total = Sum of every line item relevant to your selected installation method
Every cost line is priced off the actual PURCHASED unit — never the bare theoretical volume — and only line items relevant to your selected Sand-Set/Mortar-Set branch are included in the total.
Worked Example
This example walks through your current inputs above, using the same steps as the Formula section.
Input Values Used
| Input | Value |
|---|---|
| Patio Size | 16 x 12 ft (192 sq ft) |
| Installation Method | Sand-Set |
| Surface Material | 4 x 8 in (Standard Brick), Running Bond (Stretcher) — lowest waste |
Step 2a — Base Course
| Calculation | Result |
|---|---|
| 192 sq ft x 4/12 ft, +15% compaction +8% waste | 2.944 cu yd (4.59 tons) |
Step 3 — Bedding Sand
| Calculation | Result |
|---|---|
| 192 sq ft x 1/12 ft, +10% waste | 0.652 cu yd |
Step 4a — Pavers
| Calculation | Result |
|---|---|
| 201.6 sq ft / 0.2222 sq ft per paver | 908 pavers |
Step 5 — Joint Fill
| Calculation | Result |
|---|---|
| 1.77 cu ft, +12% waste | 1.98 cu ft (4 bags) |
Figures above are rounded for display; the real quantities are always calculated from full, unrounded values.
Therefore, a 192 sq ft (16 x 12 ft) Sand-Set patio using 908 4 x 8 in (Standard Brick) pavers needs 2.944 cu yd of base and 0.652 cu yd of bedding, plus 4 bags of joint fill.