The exchange rate between Google Play cards and the Nigerian Naira can fluctuate daily. To determine exactly how much 300 Google Play card is worth in Naira today, one needs to check reliable financial news sources or currency exchange platforms.

These platforms usually provide up-to-date exchange rates based on market conditions. It's important to note that the value can change due to various factors such as economic trends, central bank policies, and global market dynamics.

When looking for the conversion, it's advisable to use a trusted source to ensure an accurate figure. This helps in getting the most precise amount for which the 300 Google Play card can be exchanged into Naira on the current day.