Split travel costs across a group.
Splitting a group trip means keeping shared and individual costs apart. Accommodation, a hired van, fuel and tolls are group costs that divide by headcount, so each additional traveller lowers everyone's share — that is the entire economic case for group travel. Flights and activities are per person and do not benefit. Adding a small contingency margin is what stops the organiser absorbing every unbudgeted taxi and rounding error, and 5% to 10% is the range that usually covers it without needing a second collection.
Group travel cost split
Shared per person = (accommodation + transport) / group size; per person = shared + flight + activities, plus contingency %
Five to ten percent. It covers the taxis, tips and rounding that never make it into a spreadsheet, and any surplus can be returned or spent on a final meal — which is a much easier conversation than a second collection.
Only where consumption is genuinely equal. Where room quality differs or some people skip activities, split shared costs equally and charge individual items to the individuals — this calculator's structure supports exactly that.
When accommodation stops scaling — a villa sleeping eight costs the same for six or eight, so the per-person figure falls until capacity is reached and then jumps when a second property is needed.