Giardinaggio & Paesaggismo

Calcolatore di Autobloccanti e Pavimentazioni

Devi realizzare un pavimento esterno in autobloccanti, un vialetto o un passo carrabile? Il nostro calcolatore gratuito calcola il numero esatto di masselli, volume di ghiaia per fondazione, sabbia di posa e sabbia polimerica con scarto di taglio.

⚡ Quick Dimensional Presets:

Misure del Progetto

Inserisci le dimensioni per calcolare i materiali necessari

Project Type

Select your application for base depth recommendations

Area Shape

Geometry of your paved area

Project Length (or Custom Area)(ft)

Length of project, or total area if Custom Area is selected

Project Width / Diameter(ft)

Width of project (or full diameter for circular patios)

Paver Length(in)

Standard brick paver length (e.g., 8" or 20 cm)

Paver Width(in)

Standard brick paver width (e.g., 4" or 10 cm)

Joint Width (Gap)(in)

Standard sand joint width (1/8" = 0.125 in / 3 mm)

Base Gravel Depth(in)

Patios/walkways: 4–6", Driveways: 6–8"

Bedding Sand Depth(in)

Industry standard bedding layer is 1" (2.5 cm)

Cutting & Breakage Buffer

Extra pavers for border cuts and diagonal patterns

2D DRAFTING PLAN20 FT × 15 FT (300 SQ FT)

Inserisci le misure sopra per visualizzare il risultato.

Esempio di Calcolo Dettagliato

Scenario: Installing a 20 ft by 15 ft rectangular patio (300 sq ft) using standard 8x4 inch pavers with 1/8-inch joints, a 4-inch gravel base, 1-inch bedding sand, and a 10% cutting waste factor.

Calculate Patio Area: 20 ft × 15 ft = 300 sq ft.

Calculate Effective Paver Area: (8 + 0.125) in × (4 + 0.125) in = 33.52 sq in ÷ 144 = 0.2327 sq ft.

Compute Net Pavers: 300 sq ft ÷ 0.2327 sq ft = 1,289 pavers.

Add 10% Cutting Waste: 1,289 × 1.10 = 1,418 pavers.

Calculate Sub-base Gravel: 300 sq ft × (4 ÷ 12) ft × 1.10 = 110 cu ft ÷ 27 = 4.07 cubic yards (5.70 Tons).

Calculate Bedding Sand: 300 sq ft × (1 ÷ 12) ft × 1.05 = 26.25 cu ft ÷ 27 = 0.97 cubic yards (1.31 Tons).

Calculate Edge Restraints: Perimeter = 2 × (20 + 15) = 70 linear feet.

Result: You need 1,418 pavers (1,289 exact + 129 waste), 4.07 cubic yards of crushed base gravel, 0.97 cubic yards of bedding sand, 4 bags of polymeric sand, and 70 linear feet of edge restraints.

Paver Material & Base Volume Formula

Total Pavers = ⌈(Project Area ÷ Single Paver Area) × (1 + Waste %)⌉

Project area is calculated according to the chosen geometry. Single paver area includes the joint spacing allowance on all sides. Dividing project area by the effective paver area gives the net paver count. A cutting waste allowance (typically 10% for running bond, 12-15% for herringbone or curved edges) is added to account for border cuts and perimeter trimming.

Variabili della Formula

A — Total Project Surface Area (Square Feet or Square Meters)

L_p, W_p — Single Paver Length and Width (Inches or Centimeters)

J — Joint Spacing Gap (Inches or Millimeters)

a_p — Effective Single Paver Area ((L_p + J) × (W_p + J))

N_{net} — Net Exact-Fit Paver Units (⌈A / a_p⌉)

V_{base} — Compacted Sub-base Gravel Volume (Area × Base Depth × 1.10)

V_{sand} — Coarse Bedding Sand Volume (Area × Sand Depth × 1.05)

P — Perimeter Edge Restraint Length (Linear Feet or Meters)

Ipotesi di Calcolo

Standard pedestrian patios and walkways require a minimum 4-inch compacted gravel base (Class 5 or crushed road base).
Driveways and heavy vehicular surfaces require a 6 to 8-inch compacted gravel base.
Bedding sand layer must be a uniform 1 inch of uncompacted coarse concrete sand (ASTM C33).
Compacted crushed gravel weighs approximately 1.4 tons per cubic yard (1.65 tonnes per cubic meter).
Coarse bedding sand weighs approximately 1.35 tons per cubic yard (1.55 tonnes per cubic meter).
One 50 lb bag of polymeric joint sand covers approximately 75 to 100 square feet of standard paver joints.

Trade FAQ

Domande Frequenti

Risposte alle domande più comuni sul fai-da-teCalcolatore di Autobloccanti e Pavimentazioni

How many pavers do I need for my patio or walkway?

To calculate paver quantities, calculate your total project square footage and divide by the square footage of a single paver (including joint spacing). For example, a 10x10 ft patio (100 sq ft) using 4x8 inch pavers (0.222 sq ft each) requires 450 pavers net, or approximately 495 pavers with a 10% cutting allowance.

How much extra should I order for cutting waste?

For simple rectangular patios laid in a running bond or stack bond, add 10% waste. For 45-degree herringbone patterns, circular patios, or walkways with winding curves, order 12% to 15% extra to account for angled edge cuts.

How deep should the base gravel be under pavers?

For pedestrian walkways, garden paths, and residential patios, standard depth is 4 inches of compacted crushed gravel base. For driveways and vehicular surfaces, a minimum 6 to 8-inch compacted gravel base is required to prevent rutting and settling.

How much bedding sand do I need under pavers?

Apply a uniform 1-inch (2.5 cm) layer of coarse washed concrete sand (ASTM C33) directly over the compacted gravel base. Never exceed 1.5 inches of sand, as excessive sand depth causes pavers to shift and ripple under foot traffic.

What is polymeric joint sand and how much do I need?

Polymeric sand is a blend of fine sand and chemical binders that hardens when activated with water. It locks pavers together, resists erosion, and prevents weed growth and ant infestations. One 50 lb bag covers approximately 75 to 100 square feet.

Are edge restraints necessary for paver installations?

Yes, edge restraints (such as rigid plastic snap-edge or concrete troweled berms) are critical. Without edge restraints, lateral foot traffic and freeze-thaw cycles push the perimeter pavers outward, causing the entire patio surface to spread and gap.

How do I calculate pavers for a circular patio?

For a circular patio, calculate area using Area = π × (Diameter ÷ 2)². Multiply the radius by itself and by 3.14159. For example, a 12 ft diameter firepit patio has an area of roughly 113.1 sq ft. When buying standard pavers for circular designs, add at least 15% extra for curved cuts.

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