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Year On Year, particularly in the context of percentage growth or decline.

The year-on-year change is calculated from successive years' data as:

YOY change = ( Later year / Earlier year ) - 1


Later year and Earlier year = two years, exactly one year apart


Revenues have grown as follows:

Year 1: $100m

Year 2: $110m

Year 3: $132m

The related year-on-year (YOY) percentage growth figures are:

Years 1-2:

110/100 - 1

= 10%

Years 2-3:


= 20%.

Also known as Y/Y.

Sometimes written as 'YoY'.

YOY is different from the compound annual growth rate (CAGR), but they are related.

See also