How many yugioh cards are in a deck?

Answer 1

"the minimum number is 40 cards after that as many as you want"

Actually, now since the 5D era is now upon us, the new stradegy guide that comes with the Yusei mini tin (Contains 3 Yusei duelist packs, 1 Duelist Genesis pack, 3 Holofoil cards from the new Raging battle packs and I Ultra Rare card, in this case Stardust Dragon/Assualt Mode, ($14.92 at Walmart=Canadian Money) the new rules are a Minimum of 40 Cards and a Maximum of 60 Cards.To simplify what this guy just said 40-60 main deck 0-15 in a extra deck main deck has monsters, ritual monsters,spells and traps but side deck has XYZ,synchro and fusion cards
A Yugioh deck is 40 cards minimum and 60 cards maximum. Here is also the usual structure of a Yu-gi-oh deck

• 20 Monster or effect monster cards
• 10 spell cards
• 10 trap cards

Anyway you can vary the different amount of cards for each type(e.g monster spell or trap) but that all depends on what type of deck you are using.The fusion deck is separate from your original deck and can contain as many fusion cards as you want.
The most recent number/estimate is 5400 cards.

Answer 2

Konami has limited the number of cards that can be in each Deck:

• Main Deck - You can have no less than 40 cards and no more than 60 cards in this Deck.
• Extra Deck - You can have no more than 15 cards in this Deck. There is no minimum amount.
• Side Deck - You must have exactly 15 cards in this Deck; no more, no less. You can choose not to have a Side Deck.

Answer 3

The most a deck can have is 60 cards while the least they can have is 40.

Most players stick with 40-45 cards to help them with there combos and drawing the right things.