How much bigger is a size 6.5 than a 6?

Excuse me, could you please clarify the context in which you're asking about the difference in size between a 6.5 and a 6? Are we referring to shoe sizes, clothing sizes, or some other type of measurement? Assuming it's a general question about sizing, the difference between a 6.5 and a 6 can vary depending on the specific product or industry. However, in many cases, a 6.5 is typically slightly larger than a 6, perhaps by a quarter of an inch or so. It's important to consult the specific sizing chart or guidelines for the product you're interested in to get an accurate answer.