Patio materials calculator

Estimate outputs: Area with allowance, Whole pavers, Compacted base, Bedding sand, Edge restraint length. Adjust Length, Width, Paver length to match your project.

Inputs and units

Use the units shown beside each field. Replace the sample values with your measurements and the figures on the selected product packaging.

Parameter	Example input
Length	6 m
Width	4 m
Paver length	20 cm
Paver width	10 cm
Compacted base depth	15 cm
Bedding sand depth	3 cm
Waste allowance	8 %

Formula and assumptions

Whole pavers
ceil(Length × Width × (1 + Waste allowance / 100) / (Paver length × Paver width / 10000))

Compacted base
Length × Width × Compacted base depth / 100 × (1 + Waste allowance / 100)

Bedding sand
Length × Width × Bedding sand depth / 100 × (1 + Waste allowance / 100)

Edge restraint length
2 × (Length + Width) × (1 + Waste allowance / 100)

ceil = round up; floor = round down; max = the greater value. Trigonometric angles are converted from degrees to radians.

Allowance is applied before rounding to whole packages. Whole units are rounded up; displayed decimals are rounded only for readability.

Project lists use simplified rectangular geometry. They do not include every fixing, fitting, accessory or labor cost.

Worked example

Sample values are examples, not product specifications. Run the calculation again with your own measurements.

Result	Calculation
Area with allowance	25.92 m²
Whole pavers	1,296
Compacted base	3.888 m³
Bedding sand	0.7776 m³
Edge restraint length	21.6 m

Related calculators

Related tools use separate measurements. Check their inputs before transferring quantities.