Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Critical Path Duration Calculator

Estimate project duration using PERT (Program Evaluation and Review Technique) with optimistic, most likely, and pessimistic time estimates. Ideal for project managers who need a statistically weighted schedule with a built-in buffer.

Optimistic Duration (days)

Most Likely Duration (days)

Pessimistic Duration (days)

Schedule Buffer

Fill in the required fields to see your result.

Project Management

Cost Performance Index Calculator

Calculate the Cost Performance Index (CPI) — the ratio of Earned Value to Actual Cost — to measure cost efficiency. Use it as a core EVM metric to determine whether the project is delivering value efficiently or overrunning the budget.

Earned Value ($)

Actual Cost ($)

Fill in the required fields to see your result.

Key differences

	Critical Path Duration Calculator	Cost Performance Index Calculator
Category	Project Management	Project Management
Inputs required	4	2
Result	Expected Project Duration (days)	Cost Performance Index
What it does	Estimate project duration using PERT (Program Evaluation and Review Technique) with optimistic, most likely, and pessimistic time estimates. Ideal for project managers who need a statistically weighted schedule with a built-in buffer.	Calculate the Cost Performance Index (CPI) — the ratio of Earned Value to Actual Cost — to measure cost efficiency. Use it as a core EVM metric to determine whether the project is delivering value efficiently or overrunning the budget.