| KSA Year | KSA Age | UK Year | UK Age | USA Year | USA Age |
| KG1 | 3 to 4 | Nursery | Birth to 4 | Kindergarten | 3 to 6 |
| KG2 | 4 to 5 | Reception | 4 to 5 | Kindergarten | 3 to 6 |
| KG3 | 5 to 6 | Year 1 | 5 to 6 | Kindergarten | 3 to 6 |
| Grade 1 | 6 to 7 | Year 2 | 6 to 7 | Grade 1 | 6 to 7 |
| Grade 2 | 7 to 8 | Year 3 | 7 to 8 | Grade 2 | 7 to 8 |
| Grade 3 | 8 to 9 | Year 4 | 8 to 9 | Grade 3 | 8 to 9 |
| Grade 4 | 9 to 10 | Year 5 | 9 to 10 | Grade 4 | 9 to 10 |
| Grade 5 | 10 to 11 | Year 6 | 10 to 11 | Grade 5 | 10 to 11 |
| Grade 6 | 11 to 12 | Year 7 | 11 to 12 | Grade 6 | 11 to 12 |
| Grade 7 | 12 to 13 | Year 8 | 12 to 13 | Grade 7 | 12 to 13 |
| Grade 8 | 13 to 14 | Year 9 | 13 to 14 | Grade 8 | 13 to 14 |
| Grade 9 | 14 to 15 | Year 10 | 14 to 15 | Grade 9 | 14 to 15 |
| Grade 10 | 15 to 16 | Year 11 | 15 to 16 | Grade 10 | 15 to 16 |
| Grade 11 | 16 to 17 | Year 12 | 16 to 17 | Grade 11 | 16 to 17 |
| Grade 12 | 17 to 18 | Year 13 | 17 to 18 | Grade 12 | 17 to 18 |
