Mean or Expected Time Calculator

✖Optimistic Time is the shortest possible time to complete the activity if all goes well.ⓘ Optimistic Time [t₀]			+10% -10%
✖Most Likely Time is the normal time activity would take.ⓘ Most Likely Time [t_m]			+10% -10%
✖A Pessimistic Time is the longest time that an activity could take if everything is wrong.ⓘ Pessimistic Time [t_p]			+10% -10%

✖Mean Time, also called expected time is the time needed to complete an activity.ⓘ Mean or Expected Time [t_e]

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Mean or Expected Time Solution

STEP 0: Pre-Calculation Summary

Formula Used

Mean Time = (Optimistic Time+(4*Most Likely Time)+Pessimistic Time)/6
t_e = (t₀+(4*t_m)+t_p)/6
This formula uses 4 Variables

Variables Used

Mean Time - (Measured in Day) - Mean Time, also called expected time is the time needed to complete an activity.
Optimistic Time - (Measured in Day) - Optimistic Time is the shortest possible time to complete the activity if all goes well.
Most Likely Time - (Measured in Day) - Most Likely Time is the normal time activity would take.
Pessimistic Time - (Measured in Day) - A Pessimistic Time is the longest time that an activity could take if everything is wrong.

STEP 1: Convert Input(s) to Base Unit

Optimistic Time: 2 Day --> 2 Day No Conversion Required
Most Likely Time: 3 Day --> 3 Day No Conversion Required
Pessimistic Time: 10 Day --> 10 Day No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

t_e = (t₀+(4*t_m)+t_p)/6 --> (2+(4*3)+10)/6

Evaluating ... ...

t_e = 4

STEP 3: Convert Result to Output's Unit

345600 Second -->4 Day (Check conversion here)

FINAL ANSWER

4 Day <-- Mean Time

(Calculation completed in 00.013 seconds)

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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!

< Project Evaluation and Review Technique Calculators

Optimistic Time given Expected Time

LaTeX Go Optimistic Time = (6*Mean Time)-(4*Most Likely Time)-Pessimistic Time

Mean or Expected Time

LaTeX Go Mean Time = (Optimistic Time+(4*Most Likely Time)+Pessimistic Time)/6

Most Likely Time given Expected Time

LaTeX Go Most Likely Time = (6*Mean Time-Optimistic Time-Pessimistic Time)/4

Pessimistic Time given Expected Time

LaTeX Go Pessimistic Time = 6*Mean Time-Optimistic Time-4*Most Likely Time

Mean or Expected Time Formula

LaTeX Go

Mean Time = (Optimistic Time+(4*Most Likely Time)+Pessimistic Time)/6
t_e = (t₀+(4*t_m)+t_p)/6

What is Programme Evaluation and Review Technique (PERT)?

It is a numerical technique used in projects in which time cannot be estimated accurately such as research and development projects. It is an event-oriented network. Cost is assumed to be directly proportional to time.
Three time estimates are made in PERT.
1. Optimistic time (to): This is the minimum possible time in which an activity can be completed under the most ideal conditions.
2. Pessimistic time (tp): This is the maximum time required to complete an activity under the worst possible conditions.
3. Most likely time (tm): This is the time required to complete an activity under normal working conditions. It's value lies between to and tp It is near to the expected time.

What is most likely time?

Most likely time is based on experience and judgement based on time required if the activity is repeated number of times essentially under same situations. It reflects a situation " things are normal, nothing exciting."

How to Calculate Mean or Expected Time?

Mean or Expected Time calculator uses Mean Time = (Optimistic Time+(4*Most Likely Time)+Pessimistic Time)/6 to calculate the Mean Time, The Mean or Expected Time formula is defined as the time taken for completion of an activity. It is found based on the PERT technique. Mean Time is denoted by t_e symbol.

How to calculate Mean or Expected Time using this online calculator? To use this online calculator for Mean or Expected Time, enter Optimistic Time (t₀), Most Likely Time (t_m) & Pessimistic Time (t_p) and hit the calculate button. Here is how the Mean or Expected Time calculation can be explained with given input values -> 4.6E-5 = (172800+(4*259200)+864000)/6.

FAQ

What is Mean or Expected Time?

The Mean or Expected Time formula is defined as the time taken for completion of an activity. It is found based on the PERT technique and is represented as t_e = (t₀+(4*t_m)+t_p)/6 or Mean Time = (Optimistic Time+(4*Most Likely Time)+Pessimistic Time)/6. Optimistic Time is the shortest possible time to complete the activity if all goes well, Most Likely Time is the normal time activity would take & A Pessimistic Time is the longest time that an activity could take if everything is wrong.

How to calculate Mean or Expected Time?

The Mean or Expected Time formula is defined as the time taken for completion of an activity. It is found based on the PERT technique is calculated using Mean Time = (Optimistic Time+(4*Most Likely Time)+Pessimistic Time)/6. To calculate Mean or Expected Time, you need Optimistic Time (t₀), Most Likely Time (t_m) & Pessimistic Time (t_p). With our tool, you need to enter the respective value for Optimistic Time, Most Likely Time & Pessimistic Time and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Mean Time?

In this formula, Mean Time uses Optimistic Time, Most Likely Time & Pessimistic Time. We can use 1 other way(s) to calculate the same, which is/are as follows -

Mean Time = Scheduled Time-(Standard Deviation*Probability Factor)

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