The annualised rate of return (ARR) is geometric, time-weighted, and calculated by compounding index-level period returns. The measure gives an equal weight to each period.  is reported in various horizons: the current quarter, one, three, five and 10 years, and the rate since inception of the index.

ARR_{n} = [(1+TR_{1}) \times (1+TR_{2}) \times ... \times (1+TR_{n}) ]^{\frac{1}{n}} - 1


where:

 is the annualised rate of return for a given period of time n.
 denotes the quarterly Total Investment Return of the index.
n denotes the given time period.