The girls had arrived Abuja earlier in the day from Maiduguri, Borno state capital, in military choppers.
They then underwent medical check-ups at the Department of State Services (DSS) clinic.
Buhari’s Chief of Staff, Abba Kyari, told Channels TV that the president was “extremely pleased and glad” over their release.
“Since the first set of girls were released last year, he gave instructions to all security agencies to leave no stone unturned until all the girls are released,” he said.