I know most of us will never hold 100 BTC, but I wanted to see the number for fun. Landed on https://paybis.com/btc-to-usd/100/ and it instantly showed me that 100 BTC equals over 7.5 million USD at current rates. The calculator updates live, and you can flip it to see how much BTC you'd get for any dollar amount. It also has a profit calculator where you can pick any purchase date and see what your investment would be worth today. I plugged in a hypothetical buy from a year ago and was honestly surprised. No account needed, no ads, just clean numbers. Bookmarked it for checking larger BTC amounts quickly.