Add up every shared cost for the trip: accommodation, activities, dining, transport, and decor. Divide the total by the number of people attending. If the group is covering the bride, divide by the number of paying guests instead, so her share spreads across everyone else.
It varies by group. A common approach is that guests cover the bride: she pays for her own flights and personal spending, and the group splits her share of the shared costs. Decide this before anyone books, because it changes the per-person number for every guest.
Take her even share and divide it across the paying guests. For a group of eight where each even share is 200, covering the bride adds about 29 to each of the seven guests, so they pay roughly 229 instead of 200. The calculator shows the exact figure for your numbers.
Shared costs are the things the whole group uses: the house or hotel, the booked activities, group dinners, shared transport, and decor. Personal costs stay with each person: flights, drinks they order alone, and anything optional that only some people join. Splitting only the shared costs keeps it fair.
Yes. It runs in your browser, needs no signup, and stores nothing. Change the headcount or costs and the per-person number updates instantly.