To answer concisely: in the U.S. House of Representatives, a simple majority is needed to pass most bills. That means 218 votes if all 435 members are voting. If a party holds a strong majority, passing often requires fewer actual yes votes if some members are absent or abstain, but the standard threshold for a simple majority is 218 when all 435 are considered for the calculation. For constitutional amendments, a two-thirds vote is required (290 votes if all 435 are voting). If the House rules or the specific bill include special procedures (e.g., unanimous consent, discharge petitions, or budget reconciliation rules), those can affect timing but not the basic arithmetic threshold for passage.