The exchange rate between the US dollar and the Nigerian naira is constantly fluctuating. To determine how much 100 dollars' worth of Amazon gift card is equivalent to in naira today, one needs to refer to the current market exchange rates.

Exchange rates are influenced by various factors such as economic conditions, central bank policies, and global market trends. These fluctuations can cause the value of the conversion to vary significantly from one day to another.

To obtain the most accurate figure for how much 100 dollars' Amazon gift card is worth in naira today, it is advisable to check reliable financial news sources, currency exchange platforms, or consult a professional in the field of foreign exchange. This will ensure that the conversion is based on the latest and most accurate exchange rate available.