In order for a measure to pass in the United States Senate or Congress - it only takes a majority of votes or 1 vote more than half the number of those voting.
2/3 vote
2/3 vote in both houses
Typically, a majority vote is needed to pass laws in most legislative bodies. This means that more than half of the members or representatives must vote in favor for a law to pass. In some cases, a specific percentage may be required by the rules or constitution of the governing body.
51 perce t
In the U.S. Senate, 51 votes are needed to pass a bill on the floor. A bill can also pass on a tie vote (50 - 50 or otherwise), as the Vice President will then cast a vote to break the tie. A bill cannot even reach the floor for a vote, however, if it is the subject of a filibuster unless there are 60 votes for cloture (which will allow a floor vote on the bill). In the U.S. House, 218 votes are needed to pass a bill on the floor.
Each state is different so there is no general answer.
some require 51% others 75%
2/3 of the voters need to vote to pass it.
3/2
A simple majority is needed, in the event of a tie the speaker will vote to break the deadlock.
A simple majority which would mean 216 of the 435 votes in Congress is needed to pass a bill of impeachment and force the Senate to hold a trial. (In order to convict, two-thirds of the Senators voting must vote to convict.)
A simple majority is needed to pass a motion of no confidence, meaning only one more vote than the opposing side. The most recent successful motion of no confidence which led to the collapse of James Callaghan's government was passed 311-310.