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In a standard 5-card poker hand for 1 deck:

Calculate P(Flush)

Flush Hands

Flush

Calculate Total 5 Card hands

Choose 5 cards from 52 cards

Total Hands  =  52!
  (52-5)! * 5!

Total Hands  =  52!
  47! * 5!

Total Hands  =  (52 * 51 * 50 * 49 * 48) * 47!
  47! * (5 * 4 * 3 * 2 * 1)

Cancelling the 47!, we get:

Total Hands  =  311,875,200
  120

Total Hands = 2,598,960

Build Probability

Possible flushes = Possible ways to get 5 of the same suit.

Possible flushes in one suit * 4 suits = 13! * 4/((13 - 5)! * 5!) = 5,108 ways

Total Possible flushes * 4 possible suits = (13 * 12 * 11 * 10 * 9 * 4) / (5 * 4 * 3 * 2 * 1)

Possible flushes - (36 straight . 4 Royal {Flushes}) = (617,760 / 120) - 40

Possible flushes = 5,148 - 40

Possible flushes = 5108

Probability of a flush  =  Possible flushes
  Total Hands

Reduce top and bottom by 4

GCF = Greatest Common Factor

P(Flush)  =  5,108
  2,598,960

GCF for 1277 and 649740 = 4

P(Flush)  =  1,277
  649,740

Final Answer

Decimal probability = 0.0019654015


You have 2 free calculationss remaining




What is the Answer?
Decimal probability = 0.0019654015
How does the 5 Card Poker Hand Calculator work?
Free 5 Card Poker Hand Calculator - Calculates and details probabilities of the 10 different types of poker hands given 1 player and 1 deck of cards.
This calculator has 1 input.

What 1 formula is used for the 5 Card Poker Hand Calculator?

Total Possible 5 Card Hands = 2,598,960

For more math formulas, check out our Formula Dossier

What 4 concepts are covered in the 5 Card Poker Hand Calculator?

5 card poker hand
combination
a mathematical technique that determines the number of possible arrangements in a collection of items where the order of the selection does not matter
nPr = n!/r!(n - r)!
factorial
The product of an integer and all the integers below it
probability
the likelihood of an event happening. This value is always between 0 and 1.
P(Event Happening) = Number of Ways the Even Can Happen / Total Number of Outcomes
Example calculations for the 5 Card Poker Hand Calculator

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