Patio Area Calculator
Measure your patio and convert its surface area into square meters, square feet, square yards and other units. Choose a shape, enter your dimensions, and optionally add extra area for cutting waste or spare materials.
Calculate your patio size
Select the closest patio shape and use the same measurement unit for all dimensions.
How the patio area calculation works
The calculator first converts your measurements into meters. It then calculates the base surface area in square meters and converts that result into other units. The optional allowance is added after the patio's measured area has been calculated.
Area formulas by shape
Rectangle: area = length × width Circle: area = π × radius² Semicircle: area = (π × radius²) ÷ 2 Triangle: area = (base × perpendicular height) ÷ 2 Two sections: area = section 1 area + section 2 areaExample: a rectangular patio
If a patio is 10 meters long and 4 meters wide, its measured area is 10 × 4 = 40 m². With a 10% allowance, the additional area is 4 m², giving a material-planning area of 44 m², approximately 473.61 ft².
Measured area versus material allowance
The measured area describes the actual patio surface. The area including allowance is a planning estimate for purchasing materials. It does not account for individual slab sizes, pattern layouts, edge cuts, drainage requirements or supplier-specific packaging. For ordering, round up to whole packs after checking the coverage listed by the manufacturer.
Related area and surface calculators
Use these tools for other outdoor measurements and material-planning tasks.