tsioumiou,
please allow at least 24 hours before bumping your thread. All members here are volunteers. We all have lives, jobs, families, and weekends.
You can use a macro to achieve your goal. The code below assumes that the exchange rate is stored in cell C2, the Euro value is entered in A2 and the Dollar value in B2.
You can enter either Euro or Dollar, and the respective other currency will be calculated.
The code goes into the Sheet module (right-click the sheet tab, select View Code and paste the code into the code window of the VBE)
cheers
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