As the final vote counting showed on Friday, Mr Rohani was elected to replace incumbent President Mahmoud Ahmadinejad by collecting 18,613,329 votes from a total of 36,704,156.
72.2% of the 50 million eligible Iranians took part in the election marking a massive turnout, Interior minister Mostafa Mohammad Najjar told a news conference on Saturday.
The final results for other candidates are:
Tehran Mayor Mohammad Baqer Qalibaf: 6,077,292 votes
Supreme National Security Council Secretary Saeid Jalili: 4,168,946 votes
Expediency Council Secretary Mohsen Rezaei: 3,884,412 votes
Former foreign minister Ali Akbar Velayati: 2,268,753 votes
Former telecommunications minister Mohammad Gharazi: 446,015 votes
