Sisi, 59, won at least 23.9 million votes with an overwhelming number of Egyptians choosing the retired Field Marshal over his only electoral rival Hamdeen Sabbahi, who won less than four per cent, according to provisional results.
Voter turnout in the polls was low at 47 per cent despite the government extending the polling for a third day. The turnout was lower than the election that brought Mohammed Morsi to power in 2012.
Although the results are announced by the judges supervising polling centres across the country, they are still considered unofficial as they must be verified and then announced by the Presidential Elections Commission (PEC).
Judge Tarek Shebl, a member of the PEC's general secretariat, told Al-Ahram's Arabic news website that the official results will be announced either on Sunday or Monday.
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Sisi's victory had long been predicted.
As the results began to come in, Egyptians took to the streets and stayed until the early hours of this morning to celebrate, waving Sisi's campaign posters and bringing traffic to a standstill.
The polling was held on Monday and Tuesday but apparently due to a low voter turnout the PEC added a third day of voting yesterday.
The presidential election was the second since the January 25, 2011, revolution that led to the ouster of autocrat Hosni Mubarak.
This was the first foreign-monitored election in Egypt's history. The European Union had 150 monitors across Egypt.
The African Union and the Arab League also observed the elections.
In 2012, the Muslim Brotherhood's Morsi won in a runoff with 52 per cent, just over 13 million votes. The turnout was 51 percent.