Johns Hopkins University

• Statement of purposeRequired

  Part of the online application in the Data Science Master's Program checklist ('Complete the online application, including statement of purpose, supplementary information section, unofficial transcripts'). No prompt or length limit is published on the program or admissions pages.

• Unofficial transcriptsRequired

  Unofficial transcripts of all undergraduate and previous graduate study uploaded into the online application. Applicants who attended non-US institutions are strongly encouraged to also submit a professional credential evaluation. If admitted, official final documents go directly to Graduate Admissions.

• Letters of recommendation3 letters

  From persons familiar with your abilities and achievements, especially relevant to graduate study in applied mathematics.

  Three letters of recommendation submitted electronically through the online application (recommenders are emailed by the Slate system; Interfolio letters are not accepted).

• GRE (not required)Optional

  GRE scores are not required for Spring 2027 and Fall 2027 applications (Data Science Master's Program checklist); the program page says 'No GRE required'.

• Duolingo English Test, IELTS or TOEFLIf your degree wasn't taught in EnglishRequired

  Duolingo English Test: Accepted English proficiency test at WSE. Preferred minimum score 135, recommended but not required for admission unless a degree program states otherwise. Scores older than 2 years not accepted. (WSE also accepts Cambridge English Qualifications B2 First, C1 Advanced and C2 Proficiency, preferred minimum 185.)

  IELTS: Accepted English proficiency test (IELTS Academic and IELTS Online). WSE preferred minimum band score 7, recommended but not required for admission unless a degree program states otherwise. Scores older than 2 years not accepted.

  TOEFL: Accepted English proficiency test. WSE preferred minimum: 100 (iBT 0-120 scale), 5.0 (iBT 1-6 scale), 250 (computer-based) or 600 (paper-based), recommended but not required for admission unless a degree program states otherwise. TOEFL iBT, iBT Home Edition and TOEFL ITP Level 1 accepted; TOEFL Essentials not accepted. Scores older than 2 years not accepted; send officially to code C559.

  Waiver / exemption: Not required of U.S. citizens and permanent residents. International applicants may apply in the application for the English Language Proficiency Waiver based on (1) citizenship in a listed country where the official language is English, (2) a completed or expected bachelor's or master's degree from a listed country where the official language is English, or (3) a bachelor's or master's degree from a school where the sole/primary language of instruction, writing and testing is English (school documentation required).

• PTE Academic (not accepted)If your degree wasn't taught in EnglishNot accepted

  Not on the WSE list of accepted English tests (TOEFL, IELTS, Cambridge English, Duolingo English Test); 'We do not currently accept other exams to satisfy the requirement for English Language Proficiency'.

Who can apply

• Bachelor's degreeRequired

  Must have completed a Bachelor's level degree, ideally in Engineering, Mathematics, Computer Sciences, or the Sciences. 3-year bachelor's degrees are accepted.

• Calculus through multivariable calculusOptional

  Recommended: candidates should ideally have completed undergraduate-level calculus, through multivariable calculus.

• Differential equationsOptional

  Recommended: candidates should ideally have completed undergraduate-level differential equations.

• Linear algebraOptional

  Recommended: candidates should ideally have completed undergraduate-level linear algebra.

• Probability (preferably with statistics)Optional

  Recommended: candidates should ideally have completed undergraduate-level probability, preferably complemented with a course in statistics.

• Computer programmingOptional

  Recommended: candidates should ideally have completed undergraduate-level computer programming (e.g., in C++ or Python).

• At least two proof-writing coursesOptional

  Recommended: candidates should ideally have completed at least two proof-writing courses (courses requiring students to construct careful mathematical proofs).