Earned Value Schedule Performance Index
Calculate schedule performance index and schedule variance from earned value and planned value to quantify schedule health.
Planning tool only. Validate earned value measurements against approved baselines and project controls policies.
Examples
- EV $2,400,000, PV $2,600,000, target SPI 1.00 ⇒ SPI 0.92, schedule variance -$200,000.00 (behind schedule).
- EV $1,250,000, PV $1,150,000, target blank ⇒ SPI 1.09, schedule variance $100,000.00 (ahead of schedule).
FAQ
What does SPI greater than 1.0 indicate?
An SPI above 1.0 means earned value exceeds planned value, indicating work is progressing faster than planned for the reporting period.
Can SPI be used without cost performance metrics?
Yes. SPI focuses on schedule efficiency, but it should be reviewed alongside CPI and critical path status for a complete view of project health.
How often should I refresh EV and PV?
Use your standard reporting cadence, typically monthly. Update EV based on verified progress and PV from the baseline schedule.
Why is schedule variance reported in currency?
In earned value management, schedule variance is expressed in budgeted cost terms, not time. It shows the value of work ahead or behind plan.
Additional Information
- Result unit: SPI ratio (dimensionless) plus schedule variance in USD.
- Target SPI defaults to 1.00 when left blank, representing an on-schedule baseline.
- EV and PV must use the same currency and reporting boundary to keep the index consistent.