I saw this mentioned a couple of posts down, and it reminded me of a conversation my coworkers and I were having the other day. Basically someone said they'd always heard you should 'cover the cost of your plate' when buying a gift, but how on earth do you know what that might be? As in, I'm fairly certain my friends and most of our families have no clue how much we're spending per person, and I'd be hard-pressed to guess about previous weddings I've attended (especially before I was shopping around myself).Maybe I'm just not as used to thinking about it since cash gifts aren't the norm where I'm from. Obviously you can kind of guess based on the formality, but I give something of roughly the same cost for every wedding (unless I'm really close to the couple), and I don't really think about the couple's budget. I'm not trying to judge or anything, I know this sort of thing really varies, I'm just genuinely curious about how you might determine this.