Comparing a job offer's hourly rate to your current yearly salary, or figuring out what an hourly contract actually works out to per month, means converting between pay periods. This tool does every common conversion at once (hourly, daily, weekly, bi-weekly, semi-monthly, monthly, quarterly, and yearly) from a single number you enter.
Bi-weekly means every two weeks, which is 26 pay periods a year. Semi-monthly means twice a month (like the 1st and 15th), which is 24 pay periods a year. They're easy to mix up but give different per-paycheck amounts for the same salary.
No, these are gross pay conversions, before taxes or other deductions. Actual take-home pay depends on your tax bracket and location, which this tool doesn't attempt to calculate.
Change the "Hours per week" (and "Days per week" for the daily rate) to match your actual schedule, and every conversion recalculates based on that instead of the default assumption.