On Thursday, the central bank set the official rate at 4.3724 per euro.
Against the US dollar, the leu gained 1% to 3.2482 units, from 3.2812 units a day before.
The leu opened at 4.36/4.362 to the euro, from 4.361/4.362 to the euro at Thursday closing. It traded in a narrow range for the first half of the session.
On the money market, overnight rates were at 5.95%-6.45% a year, from 5.3%-5.8% a year Thursday.