We did research to find the Catile levels for each grade. The data is collected from students in the United States with a size of over 500 thousand samples. You can see the results in the table below.

The table shows the range of Catile levels suitable for a certain grade. As an example, for grade 5 students, texts with Catile levels between 795C and 1100C are suitable. You can also say a text with 900C is suitable for grade 5 and grade 6 students. 

Grade (US)
Age
Min. Catile Level
Max. Catile Level
1
6-7
5C
365C
2
7-8
245C
605C
3
8-9
480C
810C
4
9-10
700C
1005C
5
10-11
795C
1100C
6
11-12
875C
1180C
7
12-13
940C
1250C
8
13-14
1000C
1310C
9
14-15
1050C
1360C
10
15-16
1095C
1410C
11
16-17
1140C
1450C
12
17-18
1140C
1450C

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