That's sick. Thank you. Really needed a good one of those. Request: Can you add a few other currencies? Like the Euro?
I made a simple Fiat/BTC/Sats calculator.
Some issues with existing ones include that your data is sent to a backend instead of being converted locally, the inability to easily copy and paste, and the readability issue that arises from not being able to see the exact amount due to the non-display of all eight decimal points.
Link here: https://mempool.space/tools/calculator
Discussion
Changing the currency at the bottom of the page will change the calculator currency.