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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

Budget Variance Calculator

Calculate budget variance as a percentage by comparing actual spending against planned budget. Use it for project cost control, financial reporting, and identifying overrun risk early enough to take corrective action.

Planned Budget ($)

Actual Spent ($)

Fill in the required fields to see your result.

Key differences

	Critical Path Duration Calculator	Budget Variance Calculator
Category	Project Management	Project Management
Inputs required	3	2
Result	Critical Path Duration (days)	Budget 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 budget variance as a percentage by comparing actual spending against planned budget. Use it for project cost control, financial reporting, and identifying overrun risk early enough to take corrective action.