? Cost Variance (CV%)

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Calculate if your project is under or over budget relative to the value of work completed.

$
Current value of work actually performed
$
Actual amount spent to complete that work

Cost Variance (CV%)

0%

CV% Formula & Meaning

The Formula

CV% = ((EV - AC) / EV) * 100

Cost Variance (CV%) measures budget efficiency. It answers: "How much more or less did we spend compared to the value we generated?"

  • Positive %: Under budget (Efficiency > 100%)
  • Negative %: Over budget (Costs higher than value)
  • Zero: Exactly on budget

Cost Variance: The Project Health Indicator

Cost Variance (CV) is one of the two fundamental Earned Value Management (EVM) metrics, alongside Schedule Variance. It tells project managers whether they are under or over budget at any point in the project lifecycle. Understanding CV is essential for PMP certification and professional project management.

How Cost Variance Impacts Project Success

  • Early Warning System: Negative CV trends detected early allow for corrective action before budgets spiral out of control.
  • Stakeholder Communication: CV provides an objective, quantifiable metric for budget discussions with sponsors and executives.
  • Forecasting: Combined with CPI, CV helps predict Estimate at Completion (EAC) and Variance at Completion (VAC).
  • Performance Benchmarking: Historical CV data helps estimate buffers for future projects.

Industry Benchmarks for Cost Variance

Research from the Project Management Institute (PMI) suggests that projects rarely recover once CV percentage drops below -10%. The most successful organizations maintain CV within ±5% throughout the project lifecycle. Government contracts often require monthly CV reporting and mandate corrective action plans for variances exceeding thresholds.

Best practice: Track CV weekly, not monthly, to catch trends before they become problems.

❓ Frequently Asked Questions

How do you interpret cost variance (CV) in project control?

Cost Variance = Earned Value - Actual Cost. Positive CV means under budget; negative means over budget.

How do I interpret cost variance results?

CV > 0: Under budget. CV = 0: On budget. CV < 0: Over budget.

What is an acceptable cost variance percentage?

Typically: plus/minus 5% is excellent, plus/minus 10% is acceptable, greater than 10% requires action.

🔍 Authoritative References

For more information about professional and project management calculations, consult these trusted sources:

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