The vast majority of degrees awarded to future prime ministers were in either arts or law.
Only Edmund Barton, Earle Page, and Robert Menzies undertook postgraduate studies that resulted in a substantive master's degree.
Six others undertook postgraduate studies in the form of a second bachelor's degree, including four who did so at Oxford University and proceeded to a Master of Arts by seniority.
Many of Australia's early prime ministers had limited formal education and left school at a young age to seek employment.
Chris Watson, Andrew Fisher, and Joseph Cook all finished their formal schooling before the age of 13.