The Calder Memorial Trophy is an annual award given to the player selected as the most proficient in his first year of competition in the National Hockey League. The winner is selected in a poll of the Professional Hockey Writers' Association at the end of the regular season.
From 1936-37 until his death in 1943, Frank Calder, NHL President, bought a trophy each year to be given permanently to the outstanding rookie. After Calder's death, the NHL presented the Calder Memorial Trophy in his memory and the trophy is to be kept in perpetuity.
To be eligible for the award, a player cannot have played more than 25 games in any single preceding season nor in six or more games in each of any two preceding seasons in any major professional league. The player must not be older than 26 years before September 15 of the season in which he is eligible.