The exchange rate between the US dollar and the Nigerian naira is constantly fluctuating. To determine how much 300 US dollars in Google Play gift card would be equivalent to in naira today, one needs to check the current market rate.

Exchange rates are influenced by various factors such as economic conditions, geopolitical events, and central bank policies. These fluctuations can cause the value of the conversion to vary significantly from one day to another.
To find the exact amount, it is advisable to refer to reliable financial news sources, currency exchange platforms, or consult a professional in the financial field. They can provide the most accurate and up-to-date conversion rate for 300 US dollars into Nigerian naira on the given day.