Weba free calculator to convert a salary between its hourly, biweekly, monthly, and annual amounts. Adjustments are made for holiday and vacation days. Webto decide your hourly salary, divide your annual income with 2,080. Assuming you make a hundred thousand dollars in 12 months, your hourly wage is $100,000 / 2080, or. If you work 40 hours a week, 50 weeks a year: $42 per hour = $84,000 per year. ($1,680 per week) click here for the opposite calculation. 42 dollars an hour is what per. Webif you're earning $42 per hour, you might be wondering how much you'll make in a year. To calculate your annual income, you can use the following formula: If you're working 4 hours a day, 5 days a week, at $42 an hour, your weekly earnings would be around $840. This can be calculated as $42.