Schedule Performance Index (SPI)

An indicator of schedule efficiency calculated by dividing earned value (EV) by planned value (PV).

Key Points

  • Formula: SPI = EV / PV; it compares authorized work accomplished to the work that was planned by this point.
  • Interpretation: SPI > 1.0 means ahead of schedule, SPI = 1.0 means on schedule, SPI < 1.0 means behind schedule.
  • Use only when PV > 0 and when EV and PV are measured against the same baseline; track SPI trends to monitor schedule health and forecast performance.
  • SPI shows relative schedule progress, not calendar time impact; combine with critical path analysis and CPI for a fuller picture.

Example

By the end of month 3, PV is 150 units of work and EV is 120 units. SPI = 120 / 150 = 0.80. The team is progressing at 80 percent of the planned rate, indicating the project is behind schedule.

PMP Example Question

A project reports EV = 275 and PV = 250 near the end of a phase. What is the SPI and how should the project manager interpret it?

  1. 0.91; the project is behind schedule
  2. 1.10; the project is ahead of schedule
  3. 1.00; the project is on schedule
  4. 1.10; the project is over budget

Correct Answer: B — SPI of 1.10; the project is ahead of schedule

Explanation: SPI = EV / PV = 275 / 250 = 1.10. An SPI greater than 1 indicates the project is ahead of schedule; cost status is not assessed by SPI.

How To Land the Job and Interview for Project Managers Course

Take the next big step in your project management career with HK School of Management. Whether you're breaking into the field or aiming for your dream job, this course gives you the tools to stand out, impress in interviews, and secure the role you deserve.

This isn’t just another job-hunting guide—it’s a tailored roadmap for project managers. You’ll craft winning resumes, tackle tough interview questions, and plan your first 90 days with confidence. Our hands-on approach includes real-world examples, AI-powered resume hacks, and interactive exercises to sharpen your skills.

You'll navigate the hiring process like a pro, with expert insights on personal branding, salary negotiation, and career growth strategies. Plus, downloadable templates and step-by-step guidance ensure you're always prepared.

Learn from seasoned professionals and join a community of ambitious project managers. Ready to land your ideal job and thrive in your career? Enroll now and take control of your future!



Launch your career!

HK School of Management delivers top-tier training in Project Management, Job Search Strategies, and Career Growth. For the price of a lunch, you’ll gain expert insights into landing your dream PM role, mastering interviews, and negotiating like a pro. With a 30-day money-back guarantee, there’s zero risk—just a clear path to success!

Learn More