Hi,

If there is a linear relationship between X and Y use the function FORECAST

It a power series is needed use LINEST - see example at

www.stfx.ca/people/bliengme/ExcelTips
For exponential curves use LOGEST

Give us more data and we can give you more help.

Best wishes

Bernard

"Ebodski" <jarvis@{spamless}fsmail.net> wrote in message

news:3S51c.3848$(E-Mail Removed)...

> Hi,

>

> A frequent function of my job is to analyse data on graphs/charts to
extract

> data for engineering data , i.e power / temperature/flowrates etc etc

>

> Is the a microsoft based programe i.e. Excel/Access that is capable of

> understanding data on a scaled X-Y axis that if an X value was entered in
a

> cell, the programme would extract a corresponding Y value from a line on a

> graph ?

> If anyone has any woring examples of such a thing, I'd appreciate a link

>

> Thx

>

>

>

>