Plan a trip budget in District of Columbia from daily spend, duration, flights and hotels.
A travel budget = flights + (nights × hotel) + (days × daily spend), plus a contingency buffer. Lodging counts nights (days − 1), so a day trip includes no hotel costs.
Total
Total = (flights + nights × hotel + days × daily) × (1 + buffer %)
Planning estimate only.
The buffer line is exactly for that — bump it for expensive or uncertain destinations.
Rates are approximate reference values. Local rates, exemptions and rules can differ, so treat the output as a planning figure only.