The chart below shows the spread of the minimum and maximum values for each of the 14 indicators of the Global Gender Gap Index. Each indicator is presented with its own scale of the minimum possible female and male minimum and maximum possible values. For Wage equality for similar work, this is a scale of 1 (worst value for women) to 7 (best value for women). For Estimated earned income the maximum value is 40,000 US dollars; this is the benchmark used in the calculation of the Index. For Sex ratio at birth (female / male) the maximum value is a ratio of 0.944; this is the benchmark used in the calculation of the Index. For Healthy life expectancy, the maximum value listed is that of the countries with the best performance on this indicator (Japan and Singapore at 77 years). For Years as head of state the minimum value is 0 years and the maximum value is 50 years. All other indicators are expressed as percentages with a minimum value of 0% and a maximum value of 100%. 

Male values are represented with black bars. In the case of indicators with a value that represents a combined measure of the male and female situations (Wage equality for similar work and Sex ratio at birth), a grey bar is used.