Method
Per-person daily categories โ food, local transport, activities, and the misc buffer โ are multiplied by the number of days and the number of travellers. Lodging is kept as a shared per-room cost, so it scales with days but not with party size. Flights are added as a per-person one-off. In road-trip mode, fuel is estimated as round-trip distance รท efficiency ร fuel price, and tolls are added as a single trip total.