The calculator provides the compounded interest rate based on SARON for all date combinations of the last 12 months (including non-business days) by compounding the daily SARON rates for the chosen date range. To obtain the compounded SARON, the start and end date of the observation period of a financial contract need to be selected. The methodology for the compounding follows an established standard formula and for start and end dates on non-business days an approximation formula is used, which was recommended by the National Working Group on Swiss Franc Reference Rates (NWG page 78).

The calculator is free to use for non-professional users and has a built-in delay of three business days. The full data is available as a download for licensees in the Index Data Center and allows the bulk processing of multiple date combinations.