SPI Calculator
Calculate Schedule Performance Index (SPI) to evaluate whether your project is ahead, on, or behind schedule using Earned Value Management methodology.
Calculator
SPI = EV / PVEnter values to compute.
Interpretation Guide
- SPI > 1.0Project is ahead of schedule.
- SPI = 1.0Project is exactly on schedule.
- 0.9 ≤ SPI < 1.0Mild slip — investigate causes.
- SPI < 0.9Material delay — recovery plan required.
Example
If your project planned $100,000 of work this month (PV) but only delivered $80,000 worth of completed scope (EV), SPI = 0.80 — meaning you delivered 80% of what you planned.
Real-world use cases
- Weekly PMO status reporting
- Construction progress reviews
- Portfolio dashboards and executive summaries
- Forecasting completion dates with EAC and TCPI
Common mistakes
- Using actual cost (AC) instead of EV.
- Comparing SPI across projects of different sizes without context.
- Ignoring critical-path tasks while celebrating an overall good SPI.
Professional tips
- Pair SPI with float-erosion analysis for true schedule health.
- Track SPI trend over time — direction matters more than absolute value.
- Combine with CPI for an integrated performance view.
FAQ
Frequently asked questions
Related tools
Continue exploring
Latest Insights
Project intelligence, weekly
Auto-synced from PMMilestone3.com — fresh articles with photos.
Enterprise Upgrade
Upgrade to Enterprise-Level Project Intelligence
Discover the Elite Project Controls System — a professional intelligence framework for modern project controls, forecasting, executive reporting, AI PM workflows and risk management.
- ★Executive-grade KPI frameworks
- ★AI-powered project workflows
- ★Forecasting & risk intelligence
- ★PMO-ready reporting templates