The same university can occupy very different positions in the QS World University Rankings, Times Higher Education (THE) World University Rankings and the Academic Ranking of World Universities (ARWU). This does not mean one system is “right” and another is “wrong”. Each ranking defines university excellence differently and uses different indicators, weights, calculation methods and data sources.
In brief: QS places substantial emphasis on academic reputation, employer reputation and internationalisation; THE balances five pillars of research-intensive university performance; ARWU focuses heavily on elite research achievement, major academic awards, highly cited researchers and top-tier publications.
Why do QS, THE and ARWU rank universities differently?
Global university rankings do not use a single universal formula. Each ranking measures different aspects of institutional performance, so the same university can move hundreds of places—or even change its national position—depending on the ranking system used.
Thai University Rankings reviewed the latest official methodologies of the three systems on 5 November 2026 and compared them with the latest Thai results recorded in our database.
What does QS measure?
The QS World University Rankings is organised into five performance lenses: Research and Discovery 50%, Employability and Outcomes 20%, Learning Experience 10%, Global Engagement 15%, and Sustainability 5%.
Key QS indicators
- Academic Reputation 30%
- Citations per Faculty 20%
- Employer Reputation 15%
- Faculty Student Ratio 10%
- Employment Outcomes 5%
- International Faculty Ratio 5%
- International Research Network 5%
- International Student Ratio 5%
- Sustainability 5%
QS therefore combines academic reputation, employer perceptions, graduate outcomes, research intensity, teaching resources and internationalisation rather than focusing on research output alone.
What does THE measure?
The Times Higher Education World University Rankings 2027 uses 17 performance indicators across five pillars:
- Teaching 29.5%
- Research Environment 29%
- Research Quality 30%
- International Outlook 7.5%
- Industry 4%
THE combines institutional submissions, reputation surveys and Scopus bibliometric data to assess teaching, research environment, research quality, international collaboration, industry income and patents.
Research Quality carries the largest pillar weight at 30%. For the 2027 edition, THE states that its bibliometric dataset covers publications from 2021–2025 and citations collected across 2021–2026.
What does ARWU measure?
The Academic Ranking of World Universities 2026, published by ShanghaiRanking, differs sharply from QS and THE because it focuses primarily on high-level academic and research excellence.
ARWU 2026 indicators and weights
- Alumni winning Nobel Prizes or Fields Medals: 10%
- Staff winning Nobel Prizes or Fields Medals: 20%
- Highly Cited Researchers: 20%
- Papers published in Nature and Science: 20%
- Papers indexed in Science Citation Index-Expanded and Social Science Citation Index: 20%
- Per Capita Performance: 10%
ARWU therefore places much greater emphasis on elite research strength, highly cited scholars and internationally prominent research output than on student experience, employer reputation or internationalisation.
Thai examples: different ranks do not mean conflicting data
Chulalongkorn University
- QS World University Rankings 2027: 212th
- THE World University Rankings 2027: 501–550
- ARWU 2026: 601–700
Mahidol University
- QS World University Rankings 2027: =345
- THE World University Rankings 2027: 551–600
- ARWU 2026: 501–600 and the highest-ranked Thai university in this system
These results are not contradictory. QS gives more weight to reputation and employability-related dimensions, THE balances several missions of a research-intensive university, while ARWU concentrates heavily on top-level research performance.
QS vs THE vs ARWU: which ranking should you use?
- Use QS when focusing on academic reputation, employer reputation and internationalisation.
- Use THE for a broader view of research quality, research environment, teaching and international outlook.
- Use ARWU when focusing on elite research excellence, highly cited researchers and top-tier research output.
How to read university rankings without being misled by rank numbers
- Check the ranking system because each one measures different dimensions.
- Read the indicators and weights to understand where the score comes from.
- Look at scores and rank bands, not only ordinal positions.
- Check the edition year because ranking edition labels do not always match the calendar year of publication.
For discipline-specific decisions, readers should also consult subject rankings, as an overall institutional rank cannot capture strengths across every academic field.
Conclusion: no single ranking answers every question
University rankings are comparison tools, not final answers to the question “Which university is best?” Reading a rank number without understanding the methodology can lead to misleading conclusions.
Edition note: this article uses the latest editions available in each system as of the verification date—QS 2027, THE 2027 and ARWU 2026—to demonstrate how different methodologies can produce different positions for the same institution.
Official methodology sources
- QS World University Rankings Methodology
- THE World University Rankings 2027 Methodology
- ARWU 2026 Methodology
Verified: 5 November 2026