After being awarded a B.S. from Wisconsin in 1883, he entered Johns Hopkins University in January 1884. Having studied for about eighteen months at Johns Hopkins, Cajori left in June 1885 and was awarded his Master's degree by the University of Wisconsin the following year.
Pagkatapos na iginawad ng isang BS mula sa Wisconsin sa 1883, siya ipinasok Johns Hopkins University sa Enero 1884. Ipa-aral para sa mga tungkol sa labing-walo buwan at Johns Hopkins, Cajori kaliwa sa Hunyo 1885 at noon ay iginawad sa kanyang Master's degree sa University of Wisconsin sa mga sumusunod na taon.