Compare calculators

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

Critical Path Duration Calculator

Sum the durations of three sequential tasks to estimate critical-path duration. Use it for very simple linear project sizing or as an introduction to the critical-path concept — for real projects with branching dependencies, use proper CPM software.

Task 1 Duration (days)

Task 2 Duration (days)

Task 3 Duration (days)

Fill in the required fields to see your result.

Project Management

Earned Value Calculator

Calculate the Cost Variance (CV) for a project as Earned Value minus Actual Cost, where Earned Value = Budget At Completion × Percent Complete. Use it to determine whether you are over or under budget for the work completed to date — a more meaningful metric than simple actual-vs-planned spend.

Budget at Completion ($)

Percent Complete (%)

Actual Cost ($)

Fill in the required fields to see your result.

Key differences

	Critical Path Duration Calculator	Earned Value Calculator
Category	Project Management	Project Management
Inputs required	3	3
Result	Critical Path Duration (days)	Cost Variance ($)
What it does	Sum the durations of three sequential tasks to estimate critical-path duration. Use it for very simple linear project sizing or as an introduction to the critical-path concept — for real projects with branching dependencies, use proper CPM software.	Calculate the Cost Variance (CV) for a project as Earned Value minus Actual Cost, where Earned Value = Budget At Completion × Percent Complete. Use it to determine whether you are over or under budget for the work completed to date — a more meaningful metric than simple actual-vs-planned spend.