# How to Calculate Needed Winning Percentage in Stock

This is the formula to calculate the needed winning percentage for a stock system to be considered successful:

Needed Winning Percentage = |
1 + (Commission / Average Result of Losing Operations) |

1 + Profit-Loss Ratio |

For example, if the total commission for a stock operation is 15€, the profit-loss ratio is 2, and the average result of losing operations is 400€, the formula to calculate the needed winning percentage is:

Needed Winning Percentage = |
1 + (15 / 400) |

1 + 2 |

**Needed Winning Percentage**= 0,3458 = 34,58%

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