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

Project Buffer Calculation Tool

Calculate a project buffer size using Critical Chain methodology to protect the delivery date against uncertainty and variability in task estimates. Use it during project planning when risks are hard to quantify individually.

Critical Path Duration (days)

Task Uncertainty Level

Number of Critical Tasks (tasks)

Organizational Maturity

Fill in the required fields to see your result.

Project Management

Project Buffer Sizing Calculator

Estimates the project completion buffer needed using critical chain principles, factoring in task uncertainty, resource contention, and feeding chains. Use it to set realistic schedule reserves before committing to a delivery date.

Critical Chain Duration (days)

Number of Critical Tasks (tasks)

Project Uncertainty Level

Number of Feeding Chains (chains)

Resource Contention Factor

Fill in the required fields to see your result.

Key differences

	Project Buffer Calculation Tool	Project Buffer Sizing Calculator
Category	Project Management	Project Management
Inputs required	4	5
Result	Recommended Project Buffer (days)	Recommended Project Buffer (days)
What it does	Calculate a project buffer size using Critical Chain methodology to protect the delivery date against uncertainty and variability in task estimates. Use it during project planning when risks are hard to quantify individually.	Estimates the project completion buffer needed using critical chain principles, factoring in task uncertainty, resource contention, and feeding chains. Use it to set realistic schedule reserves before committing to a delivery date.