A 2/3 majority of the number of cardinal electors taking part in a conclave are required to elected a pope. The actual number changes as the number of cardinal electors changes,
2/3 of the cardinal electorate must vote for the person for him to be elected as pope.
If the reigning pontiff dies or resigns it is necessary for the College of Cardinals to elect a new pope.
2/3 of the eligible cardinals (under age 80) are needed to elect a pope.
Pope-elect Stephen died in 752.
Bishops that elect the pope are called cardinals.
It takes 2/3 of the cardinal electors at the time to elect a pope. A cardinal elector is a cardinal under age 80.
He needs 2/3 of the votes of the cardinal electors.
The College of Cardinals elect the pope.
Pope Benedict XVI, the reigning pontiff at the time, resigned and the need to elect a new pope arose.
Cardinals elect Popes, but they are not necessarily bishops.
The cardinals use paper ballots to elect a pope. There are no voting machines used.
What goes on in a conclave is a secret so we will never know how many votes he received. All we know is that he won at least 77 votes.