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    Area & Drawings

    Circle and Sector Area Calculator

    Enter a circle radius and sector central angle to see area, circumference, sector area and arc length. Input millimetres and centimetres are normalized to metres in the results.

    MAKE IT SIMPLE
    Assumptions and limitations

    Pure geometry only; construction waste or manufacturing tolerances are not included.

    Result

    Worked examples

    Radius 1 m and a 90-degree sector

    3.1416 m² circle and 0.7854 m² sector

    Enter a circle radius and sector central angle to see area, circumference, sector area and arc length. Input millimetres and centimetres are normalized to metres in the results.

    Related tools

    Advanced Polygon Area Calculator — Draw, Add and Subtract Zones

    Draw freeform polygons or enter coordinate points, add and subtract non-overlapping areas, and calculate net square metres and boundaries.

    Area unit converter

    Convert square units, acres and pyeong

    Drawing Scale Length Converter

    Convert paper measurements to real-world dimensions and real dimensions back to paper at a 1:N drawing scale.