Since 1 Euro is equal to 344.9815726351566 Sri Lankan Rupees, we could say that n Euros are equal to 344.9815726351566 times n Sri Lankan Rupees. In other words, we could use the following formula:
Sri Lankan Rupees = Euros x 344.9815726351566
For example, let's say that we want to convert 2.0 Euros to Sri Lankan Rupees. Then, we just replace Euros in the abovementioned formula with 2.0:
Sri Lankan Rupees = 2.0 x 344.9815726351566
That is, 2.0 Euros are equal to 689.9631452703132 Sri Lankan Rupees.