Sao Tome and Principe vs Tonga: Theoretical duration of upper secondary education
Sao Tome and Principe
3 years
in 2025
Tonga
3 years
in 2025
Sao Tome and Principe rank
52nd
Tonga rank
52nd
Theoretical duration of upper secondary education over time
- Sao Tome and Principe
- Tonga
How they compare
Sao Tome and Principe currently reports 3 years against 3 years in Tonga, a difference of 0 years.
The two have swapped places 5 times across 56 shared years of data; in 1970 it was Sao Tome and Principe ahead.
Sao Tome and Principe ranks 52nd and Tonga ranks 52nd of 215 countries.
Across the 6 decades both report, Sao Tome and Principe averaged higher in 5 and Tonga in 1.
Head to head by decade
| Decade | Sao Tome and Principe | Tonga | Difference | Ahead |
|---|---|---|---|---|
| 1970s | 3 years | 2 years | 1 years | Sao Tome and Principe |
| 1980s | 2.8 years | 2.6 years | 0.2 years | Sao Tome and Principe |
| 1990s | 2.1 years | 2.8 years | 0.7 years | Tonga |
| 2000s | 2.6 years | 2 years | 0.6 years | Sao Tome and Principe |
| 2010s | 2.9 years | 2 years | 0.9 years | Sao Tome and Principe |
| 2020s | 3 years | 2.5 years | 0.5 years | Sao Tome and Principe |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher theoretical duration of upper secondary education, Sao Tome and Principe or Tonga?
- Sao Tome and Principe, at 3 years against 3 years in Tonga as of 2025.
- What is the difference in theoretical duration of upper secondary education between Sao Tome and Principe and Tonga?
- 0 years, with Sao Tome and Principe ahead.
- How many years of comparable data are there for Sao Tome and Principe and Tonga?
- 56 years are reported by both, from 1970 to 2025.
- How do Sao Tome and Principe and Tonga rank globally for theoretical duration of upper secondary education?
- Sao Tome and Principe ranks 52nd and Tonga ranks 52nd of 215 countries.
- Where does this data come from?
- UNESCO Institute for Statistics, published as Theoretical duration of upper secondary education (years). Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
February 2026 Data Release