Start with the trip, not a nightly ceiling

Write the number of travelers, nights and usable days. Include arrival and departure days even if they contain only a meal and a transfer. A four-night trip can involve five days of spending, and an early flight may add a transport cost that ordinary daytime plans would not.

Put flights or long-distance trains in one group, accommodation in another, and local spending in a third. Keep a separate contingency line. This prevents a cheap hotel from appearing affordable while transfers, meals and attractions are left outside the calculation.

Make costs comparable

Use one currency for the working total and label any conversion as an estimate. For each quote, note whether it is per person, per room, per night or per booking. Include known required charges and optional services you actually intend to use.

Compare the final accommodation total for the correct occupancy and dates. The FTC's lodging-fee guidance is useful context for US-facing bookings, but the practical task is the same wherever you travel: inspect the complete offer rather than copying a headline rate into your budget.

A hypothetical four-night example

Suppose two travelers set an illustrative trip limit of $2,400. Their long-distance travel totals $900, airport transfers $100 and planned attractions $180. They reserve $200 for unexpected changes. That leaves $1,020 for four hotel nights and five days of food and local transport. These are invented planning figures, not current prices for any city.

If they set aside $70 per day for food and local transport together, five days use $350. The amount left for accommodation is $670, or $167.50 per night when divided evenly. A hotel advertised at $170 before required charges would therefore exceed this version of the plan, even though it initially looks close.

The answer need not be a cheaper room at any cost. They could choose fewer paid attractions, change the travel dates or increase the overall amount they are comfortable spending. The calculation simply makes the trade visible before a nonrefundable booking removes those choices.

Leave variable days variable

Do not force every day to cost the same. A museum-and-restaurant day may be higher than a park-and-neighborhood day. Assign the larger planned items to their actual dates, then give ordinary meals and transport a realistic allowance.

Keep the contingency separate from optional shopping and treats. If you spend it deliberately before departure, it is no longer available for a late taxi or a changed connection. There is no universal percentage that fits every journey; identify the plausible disruptions and decide what reserve makes sense for your circumstances.

Update the sheet after booking

Replace estimates with confirmed totals as purchases are made. Mark what is paid, what remains due and what can still be changed. Revisit the plan when an itinerary change adds another city or a baggage fee.

A useful travel budget is a decision tool, not a prediction accurate to the last dollar. Its value lies in showing whether the accommodation supports the whole trip rather than quietly consuming the money intended for everything beyond the room.