When you deal with cryptocurrency, you definitely need to track the changes in USD to Bitcoin ratio. The value of Bitcoin has grown and USD/BTC pair draws the attention of major investors and traders. This is a great tool to track the growth or fall of Bitcoin and its ratio to USD: https://www.tradingview.com/symbols/BTCUSD/.
Here is a convenient and trustworthy Bitcoin to USD calculator: https://www.coindesk.com/calculator/. According to this calculator, 1 Bitcoin to USD is equal to $8,688.42. The last course update was on 02.06.2018.
This calculator works not only with USD. You can choose any world currency and convert any amount of Bitcoin currency (up to six decimal places).