Interfering Float Calculator

✖Total float is the period by which an activity can shift its timing without affecting the relevant schedule completion date.ⓘ Total Float [TF₀]			+10% -10%
✖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.ⓘ Free Float [FF₀]			+10% -10%

✖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.ⓘ Interfering Float [IF]

⎘ Copy

👎

Formula

✖

Interfering Float

Formula

`"IF" = "TF"_{"0"}-"FF"_{"0"}`

Example

`"6d"="24d"-"18d"`

Calculator

LaTeX

Reset

👍

Download Basic Formulas in Construction Planning and Management Formulas PDF

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)

FINAL ANSWER

6 Day <-- Interfering Float

(Calculation completed in 00.004 seconds)

You are here -

Home » Engineering » Civil » Construction Practice, Planning and Management » Basic Formulas in Construction Planning and Management » Critical Path Method » Interfering Float

Credits

Created by Chandana P Dev

NSS College of Engineering (NSSCE), Palakkad

Chandana P Dev has created this Calculator and 500+ more calculators!

Verified by Mithila Muthamma PA

Coorg Institute of Technology (CIT), Coorg

Mithila Muthamma PA has verified this Calculator and 700+ more calculators!

< 10+ Critical Path Method Calculators

Earliest Finish Time

Go Earliest Finish Time = Latest Finish Time-Total Float

Total Float in CPM

Go Total Float = Latest Finish Time-Earliest Finish Time

Latest Finish Time

Go Latest Finish Time = Total Float+Earliest Finish Time

Slack of Event given Independent Float

Go Slack of an Event = Free Float-Independent Float

Free Float given Indenpendent Float

Go Free Float = Independent Float+Slack of an Event

Independent Float used in CPM

Go Independent Float = Free Float-Slack of an Event

Total Float given Free Float

Go Total Float = Free Float+Slack of an Event

Free Float used in CPM

Go Free Float = Total Float-Slack of an Event

Slack of Event in CPM

Go Slack of an Event = Total Float-Free Float

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.

Home

FREE PDFs

🔍 Search