Averages, changes, and standard ranges are calculated by converting local currencies entered by respondents into US dollars using the prevailing exchange rate at the time of the response. The currency conversion process can introduce some extra volatility in salaries given that currency exchange rates sometimes fluctuate markedly from year to year.

Low Range and Hi Range are calculated by taking the standard deviation for a given group of salaries, after conversion to US dollars, and then either adding or subtracting that deviation from the average salary for the group. This range represents approximately 70% of responses, excluding the upper and lower 15% of responses.