I used to do the exact same thing until I found this super straightforward BTC to USD calculator. It's literally just one page where you type in your Bitcoin amount and it instantly shows you the live dollar value. No need to log in or anything. I use it all the time now to check my holdings or see how much a certain BTC amount is worth before making a trade. Here's the link: https://paybis.com/btc-to-usd/