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What is Estimate At Completion?

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Estimate at completion (EAC) is the total expected cost to complete a project or activity. It is typically used to estimate the cost of a project that is over or under budget. Its standard calculation is often given as:

EAC = estimate to complete + actual cost

The standard calculation of Estimate to Complete is based on Estimate At Completion, meaning that the standard formulas are circular and therefore somewhat meaningless. In practice, methods for calculating Estimate At Completion depend upon the confidence you have in baseline estimates.
For a project that is significantly off budget, it is common to develop new estimates for remaining work to calculate Estimate At Completion:

EAC = new estimates for remaining work + actual cost

For a project that is close to budget you might use the original cost baseline adjusted by any current or anticipated cost variance.
Overview: Estimate At Completion
Type
Definition
The total expected cost to complete a project or activity.
Related Concepts

Project Management

This is the complete list of articles we have written about project management.
Acceptance Criteria
Acceptance Testing
Actual Cost
Agile
Assumptions
Baseline
Basis Of Estimate
Behavioral Requirements
Burndown Chart
Change Control
Change Control Board
Change Fatigue
Change Request
Concept Note
Cone Of Uncertainty
Constraints
Corrective Action
Cost Baseline
Cost Contingency
Cost Control
Cost Overrun
Cost Variance
Defect
Defect Density
Definition Of Done
Deliverable
Document Control
Earned Value
Escalation
Estimate At Completion
Estimate To Complete
Estimates
Feasibility Analysis
Fudge Factor
Full-Time Equivalent
Human Factors
Issue Management
Issues
Lead Time
Lessons Learned
Level Of Effort
Milestone
Opportunity Study
Out Of Scope
Parametric Estimate
Phased Implementation
Planned Value
Principles
Process
Program Management
Project Charter
Project Communication
Project Complexity
Project Concept
Project Controls
Project Failure
Project Goals
Project Management
Project Metrics
Project Planning
Project Productivity
Project Proposal
Project Risk
Regression Testing
Requirements
Requirements Quality
Return On Investment
RFP
Risk Register
Schedule Baseline
Schedule Chicken
Scope
Scope Baseline
Scope Creep
Scrum
Set Up To Fail
Smoke Testing
Specifications
Sponsor
Sprint
Stakeholder
Stakeholder Management
Statement Of Work
Story Points
Subproject
Use Case
User Stories
Variance Analysis
Workaround
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