The critical path consists of the longest sequence of activities from project start to finish that must be completed to ensure the project is finished by a certain time.

Critical path gives a higher level of insight into your project’s timeline thus, giving you more understanding about which task duration you can modify, and which must stay the same.

**Formula to calculate critical path.**

Add all the time leading to the last event using different paths given and the sequence that takes the longest time is the critical path.

**Example:**

Path | Time |

1-2 | 3 days |

1-3 | 4 days |

1-4 | 7 days |

4-5 | 5 days |

5-6 | 2 days |

2-6 | 1 day |

3-6 | 2 days |

Drawing a diagram to represent the critical path is an easy way to determine the paths.

To get the critical path we add up the days taken via every path to 6.

1-2, 2-6, = 3 + 1

= 4 days

1-3, 3-6, = 4 + 2

= 6 days.

1-4, 4-5, 5-6 = 7 + 5 + 2

= 14 days

Therefore, since the critical path is the path with the longest sequence, here, our critical path will be 1-4, 4-5, 5-6.