Data enter in either of 2 cells, results in the other

[kckay]

I have 2 cells: Cell A is for mg/L and Cell B is for lbs.

I would like to enter a value in either Cell A or Cell B (not both) and have a calculated result display in the other cell.

If I enter data in Cell A (mg/L), I would like to have the calculated value of lbs display in Cell B.
If I enter data in Cell B (lbs), I would like to have the calculated value if mg/L display in Cell A.

The calculation for Cell B is Cell A * MGD (from another cell) * 8.34.
The calculation for Cell A is Cell B / (MGD * 8.34).

Is this possible? How would I go about doing this?

Thank you.

 

[Excel_Ninja]

Are you only using 2 cells?

I envision it going like this...

Cell A1 (where you could input Mg/L) and Cell B1 (where you could input the Lbs) Then to the right of that a button you click.

Depending on whether you inputted something in A1 or B1... once you click the button the other cell will self populate...

So if you put 10 in A1, click the button then 8.3454e-6... will populate in B1.... and vice versa, if you put 1 in cell B1 then 119826 will populate in A1.

Does that sound right?