Egypt's new constitution was approved by 98.1 per cent, with turnout higher than in a 2012 vote under now ousted Islamist president Mohamed Morsi, a senior government official says.
The turnout and landslide "yes" vote proved that Morsi's overthrow was a "popular revolution," another official told a press conference formally announcing the results.
The new charter replaces an Islamist-inspired one adopted in a December 2012 referendum under Morsi with about two-thirds of the vote and a 33 per cent turnout.
Authorities say it protects women's rights and freedom of speech.
Electoral committee head Nabil Salib said the turnout in the referendum on Tuesday and Wednesday, which was boycotted by Morsi's Muslim Brotherhood and its Islamist allies, "reached 38.6 per cent."
Of them, 98.1 per cent of voters approved the new constitution.
Army chief Abdel Fattah al-Sisi, the general who ousted Morsi in July after massive protests, was monitoring the outcome for an indication of support for a possible presidential bid, military officials said.
He is expected to make up his mind now that the results have been announced, with his backers already calling for a rally on January 25 to emphasise their support.
Presidential and parliamentary elections have been promised for later this year.
Sisi is wildly popular among the millions who took to the streets against Morsi, but the Islamist's followers revile him for what they say was a "coup" against Egypt's first freely elected and civilian president.
The Brotherhood, harried by a deadly crackdown since Morsi's removal, dismissed the referendum as "farce" and called for further protests.
It has also called rallies for January 25, the third anniversary of the 2011 uprising that overthrew veteran strongman Hosni Mubarak.
Interior minister Mohamed Ibrahim also called for demonstrations on the same day to counter an Islamist "plot to spark chaos," an unusual appeal from the top police official tasked with enforcing a law that restricts protests.
More than 1000 people, mostly Islamists, have been killed and thousands imprisoned in a police crackdown on pro-Morsi protests.
The government hoped a large turnout in the referendum would bolster its democratic credentials and further marginalise the Islamists.
Many who took part in the referendum said their vote was also an endorsement of Sisi, seen as a strong man capable of restoring security after the three years of turmoil following Mubarak's overthrow.
Morsi's supporters wish to have Sisi tried internationally for crimes against humanity for the deadly crackdown, but the general is adored by his supporters and will face no serious competition if he stands for election.
The US administration is closely watching the results of Egypt's referendum, but has not yet decided whether to unfreeze some $US1.5 billion ($A1.71 billion) in aid, the State Department said Thursday.
The vote has put the Brotherhood, which the government designated last month as a terrorist group, on the back foot.
Morsi himself has been in custody since his oustingr and is standing trial in the first of three separate cases against him.
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