Yearly gross pay is the hourly wage times hours per week times weeks per year. Monthly gross is that year divided by 12. Weekly gross is the wage times the weekly hours. The result is before tax.
$30 an hour, 40 hours a week, 52 weeks a year, is $62,400 a year, $5,200 a month, and $1,200 a week, all before tax. Unpaid weeks should be removed from the weeks field rather than left at 52.
Income tax, FICA, CPP, and benefits are not deducted. Use the paycheck page for a US take-home estimate after you choose the federal and state percents.