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## How do you calculate slack time?

The Formula

During the project planning period, there’s a formula the project coordinator will use to calculate the slack time for each task at each stage of a project. It’s a simple formula that you’ll easily remember: **Slack time = Latest start time – Earliest start time**.

## How do I calculate slack time in Excel?

The formula for calculating the Late start time is: (LS=LF-Duration). The Slack time is calculated as **LF minus EF**. It can also be calculated as LS minus ES. If the slack is zero, then the task is on the critical path.

## What is slack time?

Slack time can be defined as **the amount of time a task can be delayed without causing another task to be delayed or impacting the completion date of your project**. … You can leverage slack time to work on tasks that will facilitate completion of the project by the designated deadline.

## What is slack time in CPM of activity Network?

The slack time for an activity is **the time between its earliest and latest start time**, or between its earliest and latest finish time. Slack is the amount of time that an activity can be delayed past its earliest start or earliest finish without delaying the project.

## How do you calculate total float on a network diagram?

To calculate total float, **subtract the task’s earliest finish (EF) date from its latest finish (LF) date**. It looks like this: LF – EF = total float. Alternately, you can subtract the task’s earliest start (ES) date from its latest start (LS) date, like this: LS – ES = total float.