Time and trends
Year-over-year growth (YoY)
- Time and trends
Definition
The percentage change in a figure compared with the same period one year earlier.
Also called
YoY, Year-over-year growth
For your role
Choose your role to see what this term means in your work.
Why it matters
Comparing with the same period last year removes most seasonal effects.
Where it is used
Board reports, sales dashboards and annual reports. Used by FP&A analysts, sales leaders, data analysts and investors.
How to calculate it
YoY growth % = (this period - same period last year) ÷ same period last year × 100
Worked example
ILLUSTRATION. If Raket Parts B.V. revenue were €6,400,000 in September 2025 against €5,800,000 in September 2024, YoY growth would be (6,400,000 - 5,800,000) / 5,800,000 x 100 = 10.3%.
Why an illustration: the practice records start in October 2024 while systems were being filled. October 2025 (€7.63 million) against October 2024 (€0.54 million) would show +1,323%, a data start effect, not growth.
Raket Parts B.V. is a fictional company created for Insyt.
Definitions vary. Fiscal and calendar years, trading days and acquisitions all change like-for-like comparisons. Check how your organisation calculates it.