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Total Float Formula

GoTotal Float given Start Time Formula

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Total float is the period by which an activity can shift its timing without affecting the relevant schedule completion date. Check FAQs

TF 0 = LFT - (EST + t activity)

TF₀ - Total Float?LFT - Late Finish Time?EST - Early Start Time?t_activity - Activity Time?

Total Float Example

With values

With units

Only example

Here is how the Total Float equation looks like with Values.

Here is how the Total Float equation looks like with Units.

Here is how the Total Float equation looks like.

18 = 57 - (19 + 20)

18d = 57d - (19d + 20d)

18 = 57 - (19 + 20)

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Total Float Solution

Follow our step by step solution on how to calculate Total Float?

FIRST Step Consider the formula

TF 0 = LFT - (EST + t activity)

Next Step Substitute values of Variables

∴

TF 0 = 57d - (19d + 20d)

Next Step Convert Units

∴

TF 0 = 4.9E+6s - (1.6E+6s + 1.7E+6s)

Next Step Prepare to Evaluate

∴

TF 0 = 4.9E+6 - (1.6E+6 + 1.7E+6)

Next Step Evaluate

∴

TF 0 = 1555200s

LAST Step Convert to Output's Unit

∴

TF 0 = 18d

Total Float Formula Elements

Variables

Total Float

Total float is the period by which an activity can shift its timing without affecting the relevant schedule completion date.

Symbol: TF₀

Measurement: TimeUnit: d

Note: Value should be greater than 0.

Formulas to find Total Float

Late Finish Time

Late Finish Time is the latest point in time when the scheduled activity can finish so as not to delay the project completion date or any constraint.

Symbol: LFT

Measurement: TimeUnit: d

Note: Value should be greater than 0.

Formulas to find Late Finish Time

Early Start Time

Early Start Time is the earliest point in time when the scheduled activity can begin.

Symbol: EST

Measurement: TimeUnit: d

Note: Value should be greater than 0.

Formulas to find Early Start Time

Activity Time

Activity time is the estimated task duration based on preceding logic and constraints.

Symbol: t_activity

Measurement: TimeUnit: d

Note: Value should be greater than 0.

Formulas to find Activity Time

Other Formulas to find Total Float

Go Total Float given Start Time

TF 0 = LST - EST

Other formulas in Time Estimation category

Go Early Finish Time

EFT = EST + S

Go Expected Waiting Time for Customers in Queue

W q = \frac{λ a}{µ \cdot (µ - λ a)}

Go Expected Waiting Time for Customers in System

W s = \frac{1}{µ - λ a}

Go Free Float

FF 0 = EFT - EST - t activity

How to Evaluate Total Float?

Total Float evaluator uses Total Float = Late Finish Time-(Early Start Time+Activity Time) to evaluate the Total Float, Total float is the period by which an activity can shift its timing without affecting the relevant schedule completion date. Total Float is denoted by TF₀ symbol.

How to evaluate Total Float using this online evaluator? To use this online evaluator for Total Float, enter Late Finish Time (LFT), Early Start Time (EST) & Activity Time (t_activity) and hit the calculate button.

FAQs on Total Float

What is the formula to find Total Float?

The formula of Total Float is expressed as Total Float = Late Finish Time-(Early Start Time+Activity Time). Here is an example- 4.6E-5 = 4924800-(1641600+2937600).

How to calculate Total Float?

With Late Finish Time (LFT), Early Start Time (EST) & Activity Time (t_activity) we can find Total Float using the formula - Total Float = Late Finish Time-(Early Start Time+Activity Time).

What are the other ways to Calculate Total Float?

Here are the different ways to Calculate Total Float-

Total Float=Late Start Time-Early Start Time

Can the Total Float be negative?

No, the Total Float, measured in Time cannot be negative.

Which unit is used to measure Total Float?

Total Float is usually measured using the Day[d] for Time. Second[d], Millisecond[d], Microsecond[d] are the few other units in which Total Float can be measured.

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Total Float Formula

​GoTotal Float given Start Time Formula

Total Float Example

Total Float Solution

Total Float Formula Elements

Other Formulas to find Total Float

Other formulas in Time Estimation category

How to Evaluate Total Float?

FAQs on Total Float

Variable Name

GoTotal Float given Start Time Formula