100 USD is worth 0.027500 BTC as of January 17, 2019 (Thursday). Please note that we will calculate any amount of US Dollars in Bitcoins no matter how big is the number you enter, but it will be just that - a calculated number. All currencies are limited by their actual supply. It means that if there are 21,000,000 Bitcoins out there in the market you cannot buy 22,000,000 even if you have the money to spend on them.
USD/BTC Price Chart
This chart displays history of exchange rate for USD/BTC or (US Dollar / Bitcoin)