What is Class 1 to 5 equivalent to in the US education system?

As someone familiar with the K-12 system, I understand that kindergarten is typically the first year and is labeled as ‘K’, followed by 1st through 12th grade. My question is, what is the Indian education system’s Class 1 to 5 equivalent to in terms of both the grade level and the educational stage (i.e., primary, elementary) within the United States? Specifically, I’m trying to map the entire block of the first five years of schooling from one system to the other to understand the structure and expected learning milestones. What is Class 1 to 5 equivalent to in the US education system?

Here is the detailed equivalence of Class 1 to 5 in the US education system:

• Class 1: Equivalent to Kindergarten (Typically ages 5-6). This is the first year of formal schooling in the US elementary system.
• Class 2: Equivalent to Grade 1 (Typically ages 6-7).
• Class 3: Equivalent to Grade 2 (Typically ages 7-8).
• Class 4: Equivalent to Grade 3 (Typically ages 8-9).
• Class 5: Equivalent to Grade 4 (Typically ages 9-10).

Summary of Levels:

• US School Level: All five classes correspond to the Elementary School level (also frequently called Primary School in the US context).
• Grade Span: This covers the first six years of US schooling, typically starting with Kindergarten (Class 1) and ending with 5th Grade (Class 6). However, the specific equivalence requested stops at the end of Class 5, which aligns with the end of 4th Grade.