Paver & Patio Calculator

How many pavers do you actually need? This free paver and patio calculator gives DIYers and contractors a complete materials list — pavers, aggregate base, bedding sand or chip stone, polymeric sand, edge restraint and spikes, and optional sealer — for any patio shape, paver material, and pattern. Concrete pavers (ASTM C936), clay brick (ASTM C902 / C1272), natural stone (bluestone, travertine, granite, limestone, flagstone), and 2 cm porcelain pavers all built in.

The four installation methods carry different rules. Sand-set on aggregate base (ICPI Tech Spec 2) is the residential default — 4" base for a patio, 6" for a driveway, with 1" of ASTM C33 bedding sand and polymeric joint sand. Mortar-set on a cured concrete slab (TCNA F101 / F102) uses ASTM C270 Type S mortar with sanded grout joints. Pedestal-set on rooftops and balconies (ICC-ES ESR-2884P Bison or ESR-3985 Buzon) requires center support beneath each 2 cm porcelain paver larger than 12×24. PICP for stormwater (Tech Spec 18) uses NO sand — open-graded No. 2 / No. 57 / No. 8 layers with chip stone joint fill, verified at ≥ 100 in/hr per ASTM C1781.

Pattern drives the waste factor: 8% for running bond, 13% for 45° herringbone (required for vehicular ICP per Tech Spec 4), 22% for circular / radial, 18% for irregular flagstone. The calculator returns paver count with waste, base aggregate in cubic yards and tons (using the K = 324 convenience constant), bedding sand, polymeric sand bags scaled by paver thickness, edge restraint linear feet with 12" / 8" / 6" spike spacing, and sealer gallons — runs in under a minute, no signup.

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Paver & Patio Calculator

Pavers, base, bedding, polymeric sand, edge restraint, spikes, and sealer for sand-set, mortar-set, pedestal, and PICP installations.

Patio dimensions

ft
ft
LF

Application & installation method

in

ICPI Tech Spec 2: add 50–100% to the minimum base for cold / wet / weak subgrade. 4" pedestrian / 6" residential drive / 8–12" vehicular at the floor.

Paver & pattern

in

Default for Concrete 4×8 (Holland) — 60 mm: 0.125" (range 0.0625"–0.1875"). Pattern note: Most common rectangular layout. Stagger joints by 1/2 paver length.

Edge restraint

Spike spacing: 12" o.c. pedestrian, 8" o.c. driveway, 6–10" on curves. Plus 2 end-anchor spikes per 8 ft section.

Polymeric joint sand

Coverage assumes 50 lb bags at 60 mm (2-3/8") paver thickness; thicker pavers consume more sand. Pallet quantity: 56 bags per pallet (SEK / Techniseal published).

Sealer (optional)

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How to Use This Calculator

  1. Pick a shape: rectangle (length × width), L-shape (two rectangles combined), or circle (diameter). For irregular footprints, subdivide into rectangles and run the calculator on each.
  2. Pick the application: pedestrian patio / walkway (4" base default), residential driveway (6" base, herringbone required), or light vehicular (8–12" base).
  3. Pick the installation method: sand-set on aggregate base (ICPI Tech Spec 2), mortar-set on cured concrete slab (TCNA F101 / F102), pedestal-set on rooftop or deck (ICC-ES ESR-2884P / ESR-3985), or PICP open-graded for stormwater (Tech Spec 18).
  4. Pick the paver: concrete 4×8 / 6×6 / 6×9 / 8×8 (60 mm patio or 80 mm driveway), concrete slab 12×12 / 12×24 / 24×24, clay brick 4×8 (2-1/4" or 2-5/8"), natural stone (bluestone, travertine, granite, limestone, flagstone), or porcelain 24×24 / 24×48 / 16×24 (2 cm).
  5. Pick the layout pattern: running bond, stack bond, 45° or 90° herringbone, basketweave, random / ashlar, circular / radial, irregular flagstone, or French pattern. Each carries its own published waste factor.
  6. Set joint width (defaults per paver type — 1/8" sand-set concrete, 3/8" cut bluestone, 1/8"–3/16" pedestal porcelain) and toggle "curved perimeter" (+5% waste).
  7. Optional: enter linear feet of soldier-course border (4×8 paver border consumes 0.70 ft² per LF), pick a polymeric sand product / joint band (Techniseal, SEK, or Alliance Gator), and enable a sealer.
  8. Click Calculate: see paver count with waste, paver weight, aggregate base in yd³ and tons (with the 6" extended footprint), bedding sand, PICP layer-by-layer breakdown if applicable, mortar bags for mortar-set, pedestal grid quantity (M × N) for pedestal-set, polymeric sand bags scaled by paver thickness, edge restraint LF and spike count by spacing, and sealer gallons.

Why K = 324 is the calculator-critical constant

Aggregate base, bedding sand, and PICP layer volumes all reduce to one formula: cubic yards = (length_ft × width_ft × depth_in) / 324. The constant 324 is (27 ft³ per yd³) × (12 in per ft) folded together — it converts a footprint in square feet plus a depth in inches directly to cubic yards in one step. From there, multiply by the local quarry tonnage factor (1.40 tons/yd³ for dense-graded aggregate base, 1.35 for ASTM C33 sand, 1.50 for ASTM No. 2 PICP subbase) to get tons for ordering. The calculator also applies a 1.20–1.30 compaction multiplier to convert in-place compacted volume to the loose volume you need to order from the supplier — this covers loose-to-compacted shrinkage (about 15%) plus over-excavation and minor losses. The base footprint extends 6" past the paver edge in every direction so spikes anchor in compacted base, never soil, per ICPI Tech Spec 3. All of this is automatic — change the depth or the application and watch the tonnage update.

Frequently Asked Questions

How many pavers do I need per square foot?

Pavers per square foot equals 144 divided by (paver length × paver width) in inches. A 4×8 Holland paver (32 in²) gives 4.5 pavers/ft²; a 6×6 paver gives 4.0/ft²; a 6×9 gives 2.67/ft²; a 12×12 gives 1.0/ft²; a 24×24 porcelain paver gives 0.25/ft². Multiply by your patio square footage, then multiply by (1 + waste factor) — typically 8% running bond, 13% for 45° herringbone, 22% for circular, 18% for irregular flagstone — and round up. Suppliers rarely sell partial pavers.

How deep should the base be for a paver patio?

Per CMHA / ICPI Tech Spec 2: 4 inches of compacted dense-graded aggregate base (DGA / crusher run / ASTM D2940) under a pedestrian patio over well-drained subgrade; 6 inches for a residential driveway; 8–12 inches for light vehicular and streets. Add 50–100% to those minimums for cold, wet, or weak subgrade — and add a woven or non-woven geotextile per AASHTO M-288 over fine, moist, or freeze-susceptible soils. Never use bedding sand to fix a low base — bedding is 1 inch uniform of ASTM C33 concrete sand, no thicker than 1.5 inches, screeded only after the base is at finished elevation.

How do I convert patio square footage to cubic yards of base?

The convenience constant is K = 324. Cubic yards = (length_ft × width_ft × depth_in) ÷ 324. For a 14 × 12 ft patio at 6 inches of base: 14 × 12 × 6 / 324 = 3.11 yd³ compacted. Multiply by a 1.20–1.30 compaction multiplier to get the loose volume you actually need to order (covers ~15% loose-to-compacted shrinkage plus over-excavation), then by 1.40 tons/yd³ for dense-graded aggregate to get tons. Important: the base footprint should extend 6 inches past the paver edge so the edge restraint spikes anchor into compacted base, not soil — that bumps the area to (14 + 1) × (12 + 1) = 195 ft².

How much polymeric sand do I need?

Coverage varies wildly by manufacturer, joint width, and paver thickness. Manufacturer-published lower bounds per 50 lb bag: Techniseal HP NextGel 60 ft² (narrow joints) / 25 ft² (wide); SEK PolySweep 50 ft² (≤1/4") / 15 ft² (1/2"–3/4"); Alliance Gator Maxx G2 65 ft² (1/8"–3/8") / 22 ft² (3/4"–1-1/4"). Coverage is published at a 60 mm (2-3/8") paver thickness — for 80 mm pavers, multiply bag count by (paver_thickness / 2.375). Always use the lower bound for ordering, add 10% waste, and round up. Pallet quantity is 56 bags for both SEK and Techniseal.

Is edge restraint really necessary?

Yes — ICPI Tech Spec 3 makes edge restraint mandatory for every sand-set interlocking concrete paver installation. Without it, freeze-thaw cycles and lateral loads spread the field pavers and the patio loses its geometry within 1–3 winters. Plastic HDPE spike-down (Snap-Edge / Pave Edge) at 12 inches on center is acceptable for pedestrian patios; 8 inches on center for residential driveways; 6–10 inches on curves regardless of application. Add 2 end-anchor spikes per 8 ft connector segment. Spikes are 3/8 inch × 8, 10, or 12 inches and must penetrate the compacted base — the base must extend 6 inches past the paver edge, never anchor into soil.

What's the difference between sand-set, mortar-set, and pedestal-set?

Sand-set on aggregate base (ICPI Tech Spec 2) is the residential default: 4–12 inches of DGA, 1 inch C33 bedding sand, polymeric joint sand, mandatory edge restraint. Mortar-set (TCNA F101 / F102) goes over an existing structural concrete slab cured ≥ 28 days, sloped 1.5–2%: 3/4 inch ASTM C270 Type S mortar bed with sanded grout joints. Pedestal-set (ICC-ES ESR-2884P Bison or ESR-3985 Buzon) goes on rooftops, decks, and balconies: adjustable pedestals at corners (and centers for 2 cm porcelain), 1/8 inch or 3/16 inch open spacer-tab joints, no base or bedding required. PICP (Tech Spec 18) replaces all sand layers with open-graded chip stone for stormwater infiltration.

What's PICP and when do I need it?

Permeable Interlocking Concrete Pavement — sand-set ICP modified to drain stormwater through the joints into a deep open-graded reservoir. NO sand anywhere: bedding is 2" of ASTM No. 8 chip stone, base is 4" of ASTM No. 57, subbase is ≥ 8" of ASTM No. 2 (12" for vehicular). Joint fill is open-graded No. 8/89/9 chip stone at ~2 lb/ft². Surface infiltration must verify ≥ 100 in/hr per ASTM C1781 at acceptance, per CMHA Guide Spec PAV-GSP-016-21. PICP is required where local stormwater authorities credit it toward impervious-coverage limits (most MS4 jurisdictions) — outside those zones, sand-set ICP with polymeric joints is roughly half the base material cost and the better default.

Which pattern is required for a paver driveway?

Herringbone — either 45° or 90° — is required for residential driveways and any vehicular interlocking concrete pavement per ICPI Tech Spec 4. "Herringbone patterns are recommended in areas subject to vehicular traffic… other laying patterns may have lower structural capacity and resistance to lateral movement." 45° herringbone gives the highest interlock against rotation and creep under tire loads. Running bond and stack bond are pedestrian-only — they shift sideways under vehicle loads. The calculator blocks non-herringbone patterns when application = residential driveway or vehicular and surfaces an explicit Tech Spec 4 message.

What's the slip-resistance standard for porcelain pavers?

ANSI A137.1 / A326.3 — Dynamic Coefficient of Friction (DCOF) ≥ 0.42 wet for level interior areas to be walked when wet; ≥ 0.55 wet for exterior pedestrian surfaces. This is the IBC-referenced standard. ASTM C1028 (Static Coefficient of Friction by Horizontal Dynamometer) was withdrawn in 2014 with no direct replacement — do NOT specify against it. Test method is ANSI A326.3 with the BOT-3000E dynamometer. Every reputable porcelain-paver TDS reports DCOF wet/dry; reject any paver that doesn't publish the value for exterior use.

Do 2 cm porcelain pavers need a center support pedestal?

Bison ICC-ES ESR-2884P requires a center support pedestal beneath each 2 cm porcelain paver larger than 12×24 — for break-through protection. Pedestal count formula: corners (M+1)(N+1) + centers (M×N), where M and N are the tile-grid dimensions. A 6 ft × 6 ft = 3 × 3 grid of 24×24 pavers needs 16 corner + 9 center = 25 pedestals across 36 ft² (about 0.69 pedestals per ft²). Buzon ESR-3985 allows skipping center pedestals for tile sides ≤ 650 mm (~25.6 inches) AND pedestal heights ≤ 100 mm (~4 inches). Bison also requires a galvanized steel safety backer (G90, 20 ga, ASTM A653) glued to the underside of every 2 cm paver in rooftop assemblies.

When can I seal new pavers?

Wait 24–48 hours after polymeric sand cures before any sealer. For new concrete pavers — wait 60–90 days before the first sealer to allow efflorescence (calcium carbonate bloom from cement hydration) to clear; per Unilock published guidance, hold off until efflorescence is completely gone, sometimes up to a year, to prevent paver haze under the sealer. Penetrating silane/siloxane sealers (Foundation Armor SX5000 WB, RadonSeal) cover 100–250 ft²/gal in one coat and re-coat every 5–7 years. Acrylic film-forming sealers (Glaze 'N Seal, Foundation Armor AR350) cover 75–150 ft²/gal but require two coats and re-coat every 1–3 years. Apply only on dry pavers at 50–90°F.

How thick should pavers be for a driveway?

ASTM C936 sets the minimums: 60 mm (2-3/8 inches) for pedestrian patios and most residential driveways; 80 mm (3-1/8 inches) for vehicular and street use. Most homeowners use 60 mm pavers on driveways — that's the manufacturer recommendation for residential traffic when paired with a 6-inch compacted DGA base, herringbone pattern, and concrete-curb edge restraint. Step up to 80 mm where you'll regularly park heavy commercial trucks, RVs, or where a snowplow blade contacts the surface. Clay brick driveways follow ASTM C1272 Type R or F at 2-5/8 inch minimum thickness; never use ASTM C902 light-traffic brick on a driveway.