#### How do I measure area under a line chart drawn in Excel file?

```Can anyone please let me know "How do I measure area under a  line chart
drawn in Excel file?"
```
 0
KP (15)
4/18/2005 5:16:04 AM
excel.charting 18370 articles. 0 followers.

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```See examples on my website using Trapezoid & Simpson's Rule.
Bernard
www.stfx.ca/people/bliengme/ExcelTips

"kp" <kp@discussions.microsoft.com> wrote in message
news:F3BF4B4B-6030-45E1-B17E-50005FD9FBAB@microsoft.com...
> Can anyone please let me know "How do I measure area under a  line chart
> drawn in Excel file?"

```
 0
bliengme1 (122)
4/18/2005 12:55:14 PM
```I'm not aware of such a feature in the various chart menus, but you can
calculate the area directly from the data used for the chart curve.
You don't even need to make a chart, except as an aid in visualizing
the curve.

Let's suppose you have the x values in cells A1:A100, and y values in
B1:B100.
Then, in column C, do the following:

1. Put this formula in cell C1 (area contribution from the first data
point):
=B1*(A2-A1)/2

2. Put this formula in cell C2 (area contrib. from 2nd data point):
= B2*(A3-A1)/2

3. Copy the formula in cell C2 to cells C3 through C99, i.e. up to the
2nd-to-last data point.

4. Put this formula in cell C100, or wherever the last data point's row
is:
=B100*(A100-A99)/2

5.  The area is the sum of all values in column C.  So in cell D1, type
= sum(C1:C100)

This will work even if the x values are not evenly incremented.  There
are more accurate ways to do this, but this method is the simplest I
know of.

Mark

```
 0
redbelly98 (19)
4/18/2005 1:01:23 PM

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