What are the number of credit hours needed for each classification such as freshman sophomore junior senior?

There's no single, universal answer to the number of credit hours required for each undergraduate classification (freshman, sophomore, junior, senior). This varies significantly from institution to institution. Some colleges use a cumulative credit hour system, while others may have slightly different criteria.

Generally, you can expect something along these lines:

* Freshman: Typically 0-29 credit hours earned.

* Sophomore: Typically 30-59 credit hours earned.

* Junior: Typically 60-89 credit hours earned.

* Senior: Typically 90+ credit hours earned.

However, these are just *rough estimates*. You MUST check with your specific college or university's registrar's office or student handbook to determine their exact classification requirements based on earned credit hours. The criteria might also depend on whether you're in a standard four-year program, an accelerated program, or a program with varying credit hour requirements per semester.