The Sci-Fi Currency Converter is a website where you can see the exchange rates for US Dollars, Euros, British Pounds and Star Wars, Star Trek, Fallout, Sims, Skyrim, Harry Potter, Game of Thrones/A Song of Ice and Fire, Discworld, Red Dwarf and Judge Dredd money.
You just pick whichever two you want to compare, enter a value, and PRESTO. There’s also a brief explanation for how they valued each fictional currency so you can complain about how inaccurate they are while we all sit back and giggle at you for caring so much.