Webhow to calculate annual income by hand. The formula for the annual income is as follows: Annual income = hourly wage × hours per week × weeks per year. Start by calculating your regular income. This is your primary source of. Webannualization factor = 5 days × 52 weeks = 260x. Gross annual income = $400. 00 × 260x = $104,000. Webhere’s a quick rundown on how to calculate, grow, and protect your net worth for a huge financial impact both now and well into the future. What is net worth?. Webto calculate your gross annual income, multiply your monthly or weekly gross pay by the number of times you get paid per year. There are 12 pay periods if you. Webthis free investment calculator will estimate how much your investment will grow based on factors like contributions, expected return, starting balance and investment timeline.