Project Cost Variance Computation Guide (Formula Detailed)
Project managers regularly monitor project progress and compare it to the project plan, ensuring budgets stay on track. The difference between planned and actual costs, often referred to as cost variance, doesn't have to sink a project-it can actually strengthen it.
But how do you calculate cost variance, and what does it mean? To find out, let's delve into the crux of cost variance in project management.
Embrace the Masters of Cost Management: EVM (Earned Value Management)
Earned value management (EVM) provides a powerful technique for cost control. Within an EVM system, the primary goal of cost management is to establish whether a variance is positive, negative, or zero [1]. If a variance is extremely high (negative), adjustments are crucial; if variances are low (positive) or zero, it signifies effective cost management.
Positive Vibes: Positive Cost Variance
Positive cost variance (CV) signifies that the project is under budget. This occurs when the earned value (EV) exceeds the actual cost (AC). For example, if a project has earned $50,000 worth of work but has only spent $45,000, the CV is +$5,000. This suggests efficient cost management and resource utilization.
Negative Vibes: Negative Cost Variance
Negative cost variance (CV) indicates that the project is over budget. This arises when the actual cost (AC) exceeds the earned value (EV). If $40,000 worth of work has been completed but $45,000 has been spent, the CV is -$5,000. This signals potential issues, like scope creep, underestimation, or misallocated resources, requiring corrective actions.
The Art of Calculating: Cost Variance Formula
The cost variance formula is straightforward:
[\text{CV} = \text{EV} - \text{AC}]
- Earned Value (EV): Represents the planned value of work actually completed at a given point in time [2].
- Actual Cost (AC): Represents the total cost incurred for work performed on a project up to a specific point, including labor, materials, and equipment [4].
The calibration of EV and AC provides project managers with critical insights into their project’s financial health.
Three Cost Variance Calculation Methods
Three main methods to calculate cost variance help project managers analyze project costs at various points in time [3][4]:
- Cumulative Cost Variance Method: Calculates the difference between the earned value (EV) and actual cost (AC) of a project up to a specific point in time.
- Period-by-Period Cost Variance Method: Focuses on short time intervals, typically weekly or monthly, calculating the cost variance for each specific period.
- Variance at Completion (VAC) Method: Forecasts the expected cost variance at the end of the project. VAC helps project managers anticipate whether they are likely to complete the project under or over budget.
To further explore the nuances of cost variance and its impact on project management, consider investing time in our reputable and user-friendly project management software, our website. Whether you need to create and manage project budgets or share budget reports with stakeholders, our platform offers the support you need to keep your projects, and your budgets, on track.
Sources:
[1] earnedvalueonline.com (2019, December 9). Earned Value Management: 10 Project Management Formulas Explained in Super Easy English. Retrieved March 25, 2023, from https://www.earnedvalueonline.com/blog/project-management-formulas
[2] Brinkerhoff, R. C. (n.d.). Earned Value Management: The Basic Concepts and Procedures. Retrieved March 25, 2023, from https://www.brinkersolutions.com/uploads/1/2/3/1/123127899/attachments/evmwhitepaper.pdf
[3] projectmanagement.com (n.d.). Earned Value Management Technique (EVT). Retrieved March 25, 2023, from https://www.projectmanagement.com/library/earned-value-management-technique-evt-41113.aspx
[4] projectsmart.co.uk (2022, February 16). Cost Management in Project Management. Retrieved March 25, 2023, from https://www.projectsmart.co.uk/content/cost-management-project-management.aspx
[5] AriaConv Inc. (2022, September). Earned Value Management (EVM): Technique, Terms, and Factors to Succeed. Retrieved March 25, 2023, from https://ariaconsulting.com/earned-value-management-evm-technique-terms-factors-to-succeed/
In project management, cost variance is calculated using the formula: CV = EV - AC, where EV represents the planned value of work completed and AC represents the actual cost incurred. If the earned value exceeds the actual cost, it results in a positive cost variance, indicating efficient cost management and potentially additional funding for the project. Conversely, a negative cost variance signifies that the project is over budget, necessitating corrective actions to address issues like scope creep, underestimation, or misallocated resources. To effectively monitor project costs, project managers can utilize project management software for budget tracking and report sharing with stakeholders. Additionally, they can calculate cost variance using cumulative, period-by-period, or variance at completion methods to analyze project costs at various points in time.
){kind=link}