There are four kinds of piece evaluation systems.
The Fédération Internationale des Échecs or World Chess Federation is an international organization that acts as the governing body of international chess.
There is no official piece point system because the values of individual Chess pieces have no bearing or influence on game scoring.
However the following common system is the one which FIDE mostly considers standard.
King = %
Pawn = 1
Knight = 3
Bishop = 3
Rook = 5
Queen = 9
The King is given a value of % because it awards victory rather than material gain. However it is worth somewhat similar to a Pawn.