How much does 8 euros cost?

The cost of 8 euros is simply 8 euros. However, if you're asking about its value in another currency, the exchange rate will determine how much it costs in that currency. For instance, if the exchange rate is 1 euro to 1.10 US dollars, then 8 euros would cost approximately 8.80 US dollars. Always check the current exchange rate for the most accurate conversion.