| CATEGORY | US/CANADA SYSTEM | THAI SYSTEM | BRITISH SYSTEM | AUSTRALIAN SYSTEM | AGE | |
|---|---|---|---|---|---|---|
| Category 1 | Grade 4 | Prathom 4 | Year 5 | Year 4 | 9 Years | |
| Grade 5 | Prathom 5 | Year 6 | Year 5 | 10 Years | ||
| Category 2 | Grade 6 | Prathom 6 | Year 7 | Year 6 | 11 Years | |
| Grade 7 | Matthayom 1 | Year 8 | Year 7 | 12 Years | ||
| Category 3 | Grade 8 | Matthayom 2 | Year 9 | Year 8 | 13 Years | |
| Grade 9 | Matthayom 3 | Year 10 | Year 9 | 14 Years | ||
| Category 4 | Grade 10 | Matthayom 4 | Year 11 | Year 10 | 15 Years | |
| Grade 11 | Matthayom 5 | Year 12 | Year 11 | 16 Years |
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