If it's a co-worker or a distant friend, TheKnot.com recommends spending at least $75-$100 on the wedding present. If you're attending a relative or a friend's wedding, the wedding website suggests somewhere between $100 and $125. TheKnot.com also took the pulse of what real brides and grooms have spent on weddings in the past in its registry study. On average, friends spend $79 on the bride and groom's present, said Miles. Family members, meanwhile, spend an average of $146. Hill says, though, overall wedding guests should assess their budget and how well they know the bride and groom.