Difference between free float and total float

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Free float is the amount of time an activity can be delayed without delaying the project, while total float is the amount of time an activity can be delayed without delaying the successor activities.

Free float is specific to an activity, while total float is calculated across the entire project network.
Free float is calculated by subtracting the early start date of the activity from the early start date of the next activity, while total float is calculated by subtracting the early start date of the activity from the late start date without delaying the project.
Free float helps in identifying the flexibility of an activity, while total float helps in identifying the overall project schedule flexibility.