Short Project
Optimistic Time (a): 1 days; Most Likely Time (m): 2 days; Pessimistic Time (b): 3 days
Variance (V): 0.1111111111 days²; Expected Time (E): 2 days
PERT Calculator
Other0.0(0)
Calculates the expected project duration and variance using optimistic, pessimistic, and most likely time estimates.
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter Optimistic Time (a), Most Likely Time (m), and Pessimistic Time (b) in the units shown.
Step 2
Read Variance (V) and Expected Time (E) in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
Medium Project
Optimistic Time (a): 2 days; Most Likely Time (m): 5 days; Pessimistic Time (b): 8 days
Variance (V): 1 days²; Expected Time (E): 5 days
Long Project
Optimistic Time (a): 4 days; Most Likely Time (m): 8 days; Pessimistic Time (b): 12 days
Variance (V): 1.777777778 days²; Expected Time (E): 8 days
People Also Calculate
Related Calculators
Continue with another tool on a related topic.
Other
Password Entropy Calculator
Estimates the strength of a password based on its length and character set diversity, measured in bits of entropy. Higher entropy values indicate stronger, more secure passwords.
2,060 viewsOpen calculator
Other
Minecraft Stronghold Finder (End Portal Triangulation)
Estimate a Minecraft stronghold from two Eye of Ender throw positions and yaw angles. Includes negative coordinates, direction checks, and clear instructions.
1,836 viewsOpen calculator
Other
Minecraft Stack Calculator
Calculates the number of full stacks and remaining items for a given quantity of an item in Minecraft.
1,662 viewsOpen calculator
Other
D&D 5e Hit Point Calculator
Calculates the hit points (HP) for characters or monsters in Dungeons & Dragons 5th Edition, based on their Constitution modifier and Hit Dice.
1,624 viewsOpen calculator