Earned Value Management Calculator – EV, PV, AC, CPI, SPI

Earned Value Management (EVM) is a project management methodology that integrates scope, schedule, and cost to assess project performance and progress. It compares the planned work (PV) with the actual work completed (EV) and the actual cost incurred (AC) to provide objective performance metrics. EVM is widely used in government, construction, defense, and large-scale engineering projects to provide early warning signals of potential cost overruns and schedule delays.

The Cost Performance Index (CPI) measures cost efficiency: CPI = EV ÷ AC. A CPI of 1.0 means the project is exactly on budget. A CPI greater than 1.0 indicates the project is under budget (good). A CPI less than 1.0 signals cost overrun (bad). For example, a CPI of 0.83 means you are getting only $0.83 of value for every dollar spent. Industry benchmarks suggest CPI below 0.90 warrants immediate corrective action.

SPI (Schedule Performance Index) measures schedule efficiency: SPI = EV ÷ PV. It tells you whether you are ahead of or behind schedule. CPI (Cost Performance Index) measures cost efficiency: CPI = EV ÷ AC. It tells you whether you are over or under budget. Both indices are complementary — a project can be ahead of schedule but over budget (SPI > 1, CPI < 1), or behind schedule but under budget (SPI < 1, CPI > 1).

The most common formula is EAC = BAC ÷ CPI, which assumes that future cost performance will continue at the same rate as observed so far. Alternative formulas include: EAC = AC + (BAC − EV) — assumes future work will be performed at the planned rate; and EAC = AC + (BAC − EV) ÷ (CPI × SPI) — accounts for both cost and schedule impacts. This calculator uses BAC ÷ CPI as the default method.

The To-Complete Performance Index (TCPI) indicates the cost performance required on the remaining work to meet a specific target (usually the BAC or EAC). TCPI = (BAC − EV) ÷ (BAC − AC). A TCPI greater than 1.0 means you need to perform more efficiently on remaining work than originally planned — which can be difficult. A TCPI significantly above 1.2 may indicate that the original budget is no longer realistic.

Planned Value (PV) is the budgeted cost of work scheduled to be completed by a given point in time. Earned Value (EV) is the budgeted cost of work actually completed. If EV < PV, the project is behind schedule (you've earned less value than planned). If EV > PV, the project is ahead of schedule.

At project completion, EV always equals BAC (all work is done), and PV equals BAC (all work was planned to be done). Therefore, at completion, SPI = 1.0 regardless of whether the project finished early or late. This is a known limitation of SPI — it converges to 1.0 at the end. To address this, some practitioners use SPI(t) which incorporates the project's critical path and time-based metrics.

EVM has several limitations: (1) It does not measure quality — a task may be "complete" but of poor quality; (2) It relies on accurate progress reporting, which can be subjective; (3) SPI converges to 1.0 at project end regardless of actual schedule performance; (4) EVM does not account for critical path delays unless supplemented with schedule network analysis; (5) Small projects may find EVM overhead disproportionate to benefits. EVM is most effective when combined with other project controls.

EVM metrics should be calculated at regular intervals aligned with the project's reporting cycle — typically monthly for large projects, or bi-weekly for fast-paced agile or construction projects. Frequent calculation allows early detection of negative trends. Many organizations establish variance thresholds (e.g., CPI < 0.95 or SPI < 0.90) that trigger management review and corrective action plans.

Yes, EVM can be adapted for Agile projects. In Agile EVM, the BAC is typically the total budget for a release or set of sprints, PV is based on planned story points or features per sprint, and EV is based on completed and accepted story points. This hybrid approach, sometimes called "Agile EVM" or "EVM for Agile," helps track cost and schedule performance while preserving Agile flexibility. However, it requires careful mapping of story points to monetary value.