Area of an ellipse Calculator

Calculates the area, circumference, ellipticity and linear eccentricity of an ellipse given the semimajor and semininor axes.

Area of an ellipse
semimajor axis a
semiminor axis b
    1. b≦a

area S
    1.  
circumference L
    1.  
ellipticity c
    1.  
linear eccentricity f
    1.  
    Area of an ellipse
    [1-10] /60Disp-Num
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    [1]  2022/09/26 23:13   30 years old level / An engineer / Very /
    Purpose of use
    To calculate area and perimeter of a backyard ground covering project
    [2]  2022/03/08 05:50   60 years old level or over / Others / Useful /
    Purpose of use
    Confirm vendor calculation of area of a tissue.
    Comment/Request
    The shape for which I am trying to calculate the area is not a perfect ellipse. I can't paste a copy of its outline here. If a straight line is drawn across the length of the figure, from point to point, then there is less area above the line than below it. It could be described as a flattened ellipse. At the center point of the long dimension, it appears that the area below the line is about twice that above. The dimensions are 11.8 cm by 23.7 cm. This makes a=23.7/2=11.85 and b=11.8/2=5.9, if it were symmetrical. The vendor states an area of 200 sq cm. Your formula returns 219.64445... Any ideas as to how I can calculate the area of this figure? Thank you.
    [3]  2022/03/03 02:33   60 years old level or over / A retired person / Very /
    Purpose of use
    Estimate area of oval sink when molding concrete counter top
    [4]  2021/10/22 18:54   30 years old level / An engineer / Very /
    Purpose of use
    calculating area of hood on LEV system
    [5]  2021/09/20 05:30   60 years old level or over / A retired person / Very /
    Purpose of use
    Calculate reduction ratio to convert recipe for 9"x13" pan to elliptical dish with semiaxes 5"x3.5", keeping depth approximately constant. (answer: a little less than half; half will do for cooking purposes)
    [6]  2021/07/28 15:39   50 years old level / Self-employed people / Very /
    Purpose of use
    Calculation area of an oval to make a rug
    [7]  2021/06/17 04:40   50 years old level / Self-employed people / Very /
    Purpose of use
    Calculate square metreage of turf required for installation
    [8]  2021/02/08 03:12   50 years old level / An engineer / Useful /
    Purpose of use
    Calculate the equivalent circular diameter of an elliptical air intake tube on an engine.
    [9]  2021/01/10 13:47   50 years old level / Self-employed people / Very /
    Purpose of use
    Surface Area for a Pond
    [10]  2020/12/22 17:12   20 years old level / An engineer / Very /
    Purpose of use
    Approximating surface area of a crack in a pipe.

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