GardenCalcs.uk
Area Calculator — Garden Area in Square Metres
Calculate the area of rectangular, circular, and triangular garden spaces.
Choose the shape that best matches your plot. For irregular gardens, split into these shapes and add the areas.
The longer side of the rectangle, measured in metres along the ground.
The shorter side of the rectangle, measured at right angles to the length.
Extra material to order beyond the calculated area (default 0%). Use 10% for turf or gravel, 15% for irregular cuts.
Multiply area by this factor to convert units. Use 10.764 to convert m² to sq ft, or 1 to keep m² (default 1).
How We Calculate This
Rectangle: Area = Length x Width. Circle: Area = pi x Radius². Triangle: Area = 0.5 x Base x Height.
Semi-circle: Area = 0.5 x pi x Radius². L-shape: split into two rectangles and add them together.
All measurements are in metres, and results are given in square metres (m²).
Frequently Asked Questions
Break the space into regular shapes (rectangles, triangles, circles), calculate each area separately, then add them together for the total.
A square metre (m²) is a metric unit of area equal to a square with sides of 1 metre. It is the standard unit for measuring garden areas in the UK.
Multiply square metres by 10.764 to get square feet. For example, 50 m² is approximately 538 sq ft.
Knowing your garden area helps you buy the correct amount of turf, seed, gravel, paving, mulch, or other materials without over- or under-ordering.
Measure the base and the height (perpendicular distance from base to opposite corner). Area = base x height / 2. For irregular triangles, use all three sides with Heron's formula.
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Last updated: February 2026
All calculations are estimates based on standard gardening guidelines. Results may vary with soil conditions, climate, and plant varieties.