Calculate the area of a rectangle, circle, triangle, trapezoid, or ellipse with the formula shown. Results in sq ft, sq m, acres, and hectares.
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Whether you're calculating the area of a room in square feet, a garden plot in square metres, or a large land parcel in acres or hectares, this free area calculator handles every common shape instantly. It's designed for homeowners, students, architects, contractors, and real estate professionals across the USA, UK and Europe — covering both imperial and metric units in one place.
Our calculator supports ten shapes: rectangle, square, circle, triangle (including Heron's formula), trapezoid, ellipse, parallelogram, regular polygon, sector and annulus (ring). Simply pick your shape, enter the dimensions in your preferred unit — feet, inches, yards, metres, centimetres or kilometres — and results update live alongside a full unit-conversion table and a visual shape diagram.
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Select your shape from the tabs at the top. Enter dimensions in the chosen input unit (feet for US/UK imperial, metres for metric). The calculator computes the area live and displays it in your selected output unit — square feet, square metres, acres, hectares and more — simultaneously. Use the Print button to save a clean results page, the WhatsApp button to share with a colleague, or Embed to add this calculator to your own website.
In the United States, area is most commonly measured in square feet (ft²), square yards, and acres for land. In the United Kingdom and Europe, square metres (m²) and hectares (ha) are standard, though square feet remain widely understood in the UK residential property market. One acre equals 43,560 ft² or approximately 4,047 m², and one hectare equals 10,000 m² or about 2.47 acres.
Measure the length and width of the room in feet, then multiply: Area = Length × Width. For a room 12 ft long and 10 ft wide, the area is 120 sq ft. Use the Rectangle shape above and select "Feet" as the input unit.
One acre equals exactly 43,560 square feet. Our calculator automatically shows your area in acres in the conversion table.
Break the shape into simpler shapes (rectangles, triangles), calculate each area separately, and add them together. This calculator can handle each piece individually — calculate each part then sum the results.
1 hectare = 10,000 square metres. Hectares are commonly used for agricultural land and large plots in the UK and Europe. Our calculator shows both automatically.
This area calculator is provided for general informational and educational purposes only. All calculations are based on standard geometric formulas and are intended as estimates. Results may differ from official surveying, engineering, or legal measurements. FreeUSUKCalculator.com makes no representations or warranties of any kind — express or implied — regarding the accuracy, completeness, or suitability of results for any specific purpose. Always consult a qualified surveyor, architect, or engineer for decisions involving construction, land purchase, planning permission, or legal property boundaries. By using this tool you agree that FreeUSUKCalculator.com is not liable for any loss or damage arising from reliance on these results.
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