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Dear AnnieMa, Good Afternoon.

Now than I could see your Worksheet, it´s was VERY EASY to solve the question.
I spent just a few seconds to create a new formula.

You have x and y at a different cells.
It´s make all the diference.

The new formula is MORE SIMPLE, QUICKER and MORE EASY to adapt to another cells if necessary.

The new worksheet is he http://www.4shared.com/document/KHmW...r_CONC_CA.html

Please, take a look at it and tell me if it helped you.

Feel free to ask anything about it.

Ps.: I am from Brazil (Country), Minas Gerais (State), Belo Horizonte (City)
Where are you from?

Good Morning, Mazzaropi.

Your new formula works excellently. Again thank you very much for your help, you have saved me a lot of work today!

I am from Tromso, Norway, quite far north...