VAC Calculator
Variance at Completion analysis with budget forecasting and comprehensive cost management
Budget vs actual comparison
Project completion cost prediction
Budget deviation assessment
Project risk evaluation
Budget and Cost Parameters
Choose the appropriate method for your project management approach
Total authorized budget for the project
Current forecast of total project cost at completion
About VAC Calculation
Variance at Completion (VAC) = Budget at Completion (BAC) - Estimate at Completion (EAC)
Positive VAC indicates under-budget performance, while negative VAC indicates over-budget performance.
Understanding Variance at Completion
VAC Fundamentals
What is VAC?
Variance at Completion measures the difference between the authorized budget and the forecasted cost at project completion. It's a forward-looking metric that helps predict whether the project will finish over or under budget.
VAC Formula
VAC = BAC - EAC
Where:
• BAC = Budget at Completion (authorized budget)
• EAC = Estimate at Completion (forecasted total cost)
VAC Interpretation
• Positive VAC: Project under budget (surplus funds available)
• Zero VAC: Project on budget (perfect forecast)
• Negative VAC: Project over budget (additional costs expected)
Practical Applications
Budget Management
VAC helps project managers forecast final budget outcomes and make proactive decisions to control costs and optimize resource allocation throughout the project lifecycle.
Risk Mitigation
Early VAC analysis identifies potential budget overruns, allowing for timely corrective actions such as scope adjustment, resource optimization, or additional funding requests.
Stakeholder Communication
VAC provides clear, quantifiable data for stakeholder reporting, helping manage expectations and justify budget decisions with objective variance analysis.