Article V of the Constitution
"The Congress, whenever two thirds of both houses shall deem it necessary, shall propose amendments to this Constitution, or, on the application of the legislatures of two thirds of the several states, shall call a convention for proposing amendments, which, in either case, shall be valid to all intents and purposes, as part of this Constitution, when ratified by the legislatures of three fourths of the several states, or by conventions in three fourths thereof, as the one or the other mode of ratification may be proposed by the Congress; provided that no amendment which may be made prior to the year one thousand eight hundred and eight shall in any manner affect the first and fourth clauses in the ninth section of the first article; and that no state, without its consent, shall be deprived of its equal suffrage in the Senate."
open Calls for an Article V Convention
There are currently open calls from numerous states calling for an Article V convention for proposing amendments to the Constitution. Every state with the exception of Hawaii has passed Article V resolutions in some form.
Congress is currently compiling all Article V resolutions that they have received. A complete listing of currently archived resolutions is available on the website of the Office of the Clerk of the U.S. House of Representatives.