I know this question is hard.. For me it depends on relationship to that person.. but just an average.. Does where the couple is holding play into it? Does anyone hold on to their check , and write it in after they see the food they are serving? Thanks !
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*UPDATED BY WW IN 2020*
According to the 2019 WeddingWire Guest Study, the average guest typically spends $120 on a wedding gift.
Check out the WeddingWire Registry Guide for registry tips, the Rules of Wedding Gift Giving for guests, How Much to Spend on a Wedding!, How Much Money Should You Give as a Wedding Gift?, and 30 Wedding Gifts for the Couple Who Has Everything.