Here's a simple formula that you can use to convert an hourly wage to an annual salary in Excel:

Let's break down the formula:

1. Hourly wage: This is the hourly rate that you want to convert to an annual salary. For example, if the hourly wage is $15, you would enter "15" in the formula.
2. Hours per week: This is the number of hours that the employee works per week. For example, if the employee works 40 hours per week, you would enter "40" in the formula.
3. Weeks per year: This is the number of weeks that the employee works per year. For example, if the employee works 52 weeks per year, you would enter "52" in the formula.

So, if you want to convert an hourly wage of $15 for an employee who works 40 hours per week and 52 weeks per year, the formula would look like this:

This would give you an annual salary of $31,200.