The commission announced the official election results on February 25.
It said Sarkisian was reelected with 58.6 percent of the vote, while former Foreign Minister Raffi Hovannisian came in second with nearly 37 percent.
Hovannisian, who has disputed the results, is expected to hold a news conference after the announcement.
On February 24, about 4,000 supporters of Hovannisian demonstrated in Yerevan to protest the initial vote count.
Some 8,000 Hovannisian supporters protested on February 22 in Yerevan. Smaller protests were held in three other cities on February 23.
Hovannisian told journalists that he is planning to visit 21 Armenian cities this week and will hold another protest in Yerevan on February 28.