Slack Time Calculator

Your details

Choose the unit that matches your project schedule.
The earliest the task can begin, from day 0 of the project.
day
The earliest the task can finish (ES + duration).
day
The latest the task can start without delaying the project end date.
day
The latest the task can finish without delaying the project end date.
day
The earliest start of the immediately following task. Used to compute free float. Leave blank if there is no successor.
day
Total Float (Total Slack)Moderate slack
3day

Maximum delay allowed without pushing the project end date (LS - ES)

Free Float (Free Slack)5day
Task Duration4day
Float Consumed by Delay0day
Critical Path?No - has scheduling flexibility
Total Float3
Free Float5
Task Duration4

3.0 days of total float available.

  • The task has 3.0 days of total float. You can delay the start by that amount without affecting the project deadline.
  • Free float is 5.0 days: you can slip this task by that amount without touching any successor task.
  • Task duration: 4.0 days (Earliest Finish - Earliest Start).

Next stepFloat is healthy. Confirm your latest-start dates are realistic and revisit after any scope change.

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