## Interfering Float Solution

STEP 0: Pre-Calculation Summary
Formula Used
Interfering Float = Total Float-Free Float
IF = TF0-FF0
This formula uses 3 Variables
Variables Used
Interfering Float - (Measured in Day) - Interfering Float is the amount of time a scheduled activity can be delayed or extended from its early start date without delaying the project finish date.
Total Float - (Measured in Day) - Total float is the period by which an activity can shift its timing without affecting the relevant schedule completion date.
Free Float - (Measured in Day) - Free Float is the period by which an activity can shift in its timing without affecting the early start of any succeeding activity or event.
STEP 1: Convert Input(s) to Base Unit
Total Float: 24 Day --> 24 Day No Conversion Required
Free Float: 18 Day --> 18 Day No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
IF = TF0-FF0 --> 24-18
Evaluating ... ...
IF = 6
STEP 3: Convert Result to Output's Unit
518400 Second -->6 Day (Check conversion ​here)
6 Day <-- Interfering Float
(Calculation completed in 00.004 seconds)
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## Credits

Created by Chandana P Dev
NSS College of Engineering (NSSCE), Palakkad
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Coorg Institute of Technology (CIT), Coorg
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## <Critical Path Method Calculators

Total Float in CPM
​ Go Total Float = Latest Finish Time-Earliest Finish Time
Independent Float used in CPM
​ Go Independent Float = Free Float-Slack of an Event
Free Float used in CPM
​ Go Free Float = Total Float-Slack of an Event
Interfering Float
​ Go Interfering Float = Total Float-Free Float

## Interfering Float Formula

Interfering Float = Total Float-Free Float
IF = TF0-FF0

## What is Interfering float?

Interfering float is that part of the total float which causes a reduction in the float of the successor activities. It is the difference between the latest finish time of the activity in question and the earliest starting time of the following activity or zero, whichever is larger.

## What is Criticality and Critical Activity?

The degree of total float gives idea about criticality. If float is positive, the activity needs attention but has some flexibility. It is called subcritical activity.
If the float is negative, it is super critical activity and requires very special attention.
If float is 0, it is critical activity and extra attention is needed and there is no freedom of action.

## How to Calculate Interfering Float?

Interfering Float calculator uses Interfering Float = Total Float-Free Float to calculate the Interfering Float, The Interfering Float formula is defined as the amount of time a scheduled activity can be delayed or extended from its early start date without delaying the project finish date. However, it should be understood that delaying an activity into interfering float will delay the start of one or more following non-critical activities. Interfering Float is denoted by IF symbol.

How to calculate Interfering Float using this online calculator? To use this online calculator for Interfering Float, enter Total Float (TF0) & Free Float (FF0) and hit the calculate button. Here is how the Interfering Float calculation can be explained with given input values -> 6.9E-5 = 2073600-1555200.

### FAQ

What is Interfering Float?
The Interfering Float formula is defined as the amount of time a scheduled activity can be delayed or extended from its early start date without delaying the project finish date. However, it should be understood that delaying an activity into interfering float will delay the start of one or more following non-critical activities and is represented as IF = TF0-FF0 or Interfering Float = Total Float-Free Float. Total float is the period by which an activity can shift its timing without affecting the relevant schedule completion date & Free Float is the period by which an activity can shift in its timing without affecting the early start of any succeeding activity or event.
How to calculate Interfering Float?
The Interfering Float formula is defined as the amount of time a scheduled activity can be delayed or extended from its early start date without delaying the project finish date. However, it should be understood that delaying an activity into interfering float will delay the start of one or more following non-critical activities is calculated using Interfering Float = Total Float-Free Float. To calculate Interfering Float, you need Total Float (TF0) & Free Float (FF0). With our tool, you need to enter the respective value for Total Float & Free Float and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
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