Compare calculators

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

Change Request Impact Calculator

Quantifies how much a change request increases project costs as a percentage of the original budget. Use it during scope negotiations to give stakeholders a clear, data-driven picture of a change's financial impact.

Additional Hours (hours)

Hourly Rate ($/hour)

Original Budget ($)

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

	Change Request Impact Calculator	Project Buffer Sizing Calculator
Category	Project Management	Project Management
Inputs required	3	5
Result	Budget Impact (%)	Recommended Project Buffer (days)
What it does	Quantifies how much a change request increases project costs as a percentage of the original budget. Use it during scope negotiations to give stakeholders a clear, data-driven picture of a change's financial impact.	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.