The value of a 250 Xbox card in Nigerian Naira today can vary depending on several factors. Exchange rates are constantly fluctuating in the global market.

Typically, to determine how much it is worth in Naira, one would need to check the current exchange rate between the currency in which the Xbox card is denominated (usually in a major international currency like the US dollar) and the Nigerian Naira. This exchange rate can be obtained from financial institutions, currency exchange platforms, or online financial news sources.

Once the exchange rate is known, the conversion can be calculated. For example, if the exchange rate is such that 1 US dollar is equivalent to a certain number of Naira, and the Xbox card is priced in US dollars, then multiplying the value of the card in dollars (250) by the exchange rate will give the approximate value in Naira. However, it's important to note that there may be additional fees or margins added by currency exchange services, which could slightly affect the final amount received in Naira when converting the Xbox card.