# Schedule Performance Index (SPI) Calculator

> Measure how much of the planned work the project has actually completed.

Page: https://freecalculator.tech/tools/schedule-performance-index-calculator
Last reviewed: 2026-09-15

## Formula

SPI = EV ÷ PV; SV = EV − PV

- SPI = EV ÷ PV; SV = EV − PV.
- Inputs used: Currency, Earned value (EV), Planned value (PV).
- Edge handling: Earned value (EV) is required.; Earned value (EV) cannot be negative.; Earned value (EV) must be no more than 1000000000000.; Planned value (PV) is required.; Planned value (PV) must be greater than zero..

## Inputs

- Currency
- Earned value (EV)
- Planned value (PV)

## Worked example: $80,000 earned against $100,000 planned

An SPI of 0.8 — one fifth of the planned work is outstanding.
1. Start with Currency: USD, Earned value (EV): 80000, Planned value (PV): 100000.
2. Apply the method: SPI = EV ÷ PV; SV = EV − PV.
3. An SPI of 0.8 — one fifth of the planned work is outstanding.

## Common questions

### Where does this formula come from?

PMI earned value management practice guidance: SPI and SV definitions. See the source link on this page.

### What kind of calculation is this?

Earned value divided by planned value; the schedule variance is the difference between them. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### What are its limits?

Near the end of a project SPI tends towards 1 even when the project is late; use schedule analysis as well. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### How do I use the Schedule Performance Index (SPI) Calculator?

Enter the required values for Currency, Earned value (EV), Planned value (PV). The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the Schedule Performance Index (SPI) Calculator use?

SPI = EV ÷ PV; SV = EV − PV The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.

### Can the Schedule Performance Index (SPI) Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this schedule performance index (spi) calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- PMI — https://www.pmi.org/learning/library/earned-value-management-systems-analysis-8026

## Cite this page

- APA: Free Calculator. (2026, September 15). Schedule Performance Index (SPI) Calculator. https://freecalculator.tech/tools/schedule-performance-index-calculator
- MLA: "Schedule Performance Index (SPI) Calculator." Free Calculator, 15 Sept. 2026, https://freecalculator.tech/tools/schedule-performance-index-calculator.
- Link: Schedule Performance Index (SPI) Calculator — Free Calculator, https://freecalculator.tech/tools/schedule-performance-index-calculator