A $299 flight can be a good deal without making the whole holiday inexpensive. Once you add accommodation, meals, airport transfers and the activities you want to do, the total may look quite different.
To calculate your trip budget, add transport, accommodation, daily spending, activities and pre-departure expenses in one currency. Then add a contingency allowance and check how much you need to pay now, before departure and during the trip.
The aim is a realistic estimate you can afford, with enough detail to compare different dates and destinations. Here is how to build it.
1. Set the Dates, Traveller Count and Budget Limit
Write down how many people are travelling, how many nights you need accommodation and how many days you will be buying meals and using local transport. A five-night trip can involve six days of spending.
Choose a home currency for your calculations and decide whether each figure covers one person or the whole group. Flights are usually priced per passenger, while a hotel quote might cover a room shared by two people.
Set a spending ceiling before browsing upgrades. If you are still building the holiday fund, our guide to saving money for travel can help you turn the target into a savings plan.
2. Compare the Full Flight and Accommodation Prices
The first price you see may not include every optional service you want. Check baggage, seat selection, meals and booking conditions, then compare flights with the same requirements included.
As a hypothetical example, fees can add 20% to a $300 fare if your chosen extras total $60. That percentage is an illustration of the arithmetic, not an industry average established by the linked study, which examines ancillary revenue and airline revenue surplus.
For accommodation, compare the total for the same dates, occupancy and cancellation terms. Check whether breakfast, parking and any amenities you plan to use are included.
It is inaccurate to assume that hotels always hide mandatory fees until checkout. In the US, the FTC’s lodging price rule, effective from 12 May 2025, requires advertised prices for covered short-term lodging to include mandatory fees. Government charges and optional extras can be excluded from the initial total under the rule, but must be disclosed before payment.
Do not add a fee twice. If the booking total already includes a cleaning or resort fee, record it as included rather than adding it again. A refundable security deposit or temporary card hold should be tracked separately from expected spending, since it can still affect your available funds.
3. Build a Complete Travel Expense Checklist
Flights and accommodation may be your largest costs, but their share varies with the trip. A city break, a driving holiday and a guided expedition need different budgets.
| Category | What to include | How to calculate it |
|---|---|---|
| Main transport | Flights, rail or ferry tickets, baggage and selected extras | Total price for everyone travelling |
| Accommodation | Rooms, mandatory charges and selected extras | Total for the required nights and occupancy |
| Local transport | Airport transfers, public transport, taxis or vehicle hire | Transfers plus estimated daily journeys |
| Food and drink | Meals, snacks, drinks and applicable service charges or tips | Daily allowance per person multiplied by days and travellers |
| Activities | Tickets, tours, equipment hire and reservations | Actual quotes for your group |
| Before departure | Insurance, entry documents, necessary equipment and airport parking | Itemised costs relevant to your trip |
| Other expenses | Mobile data, laundry, payment fees and pet care at home | Trip-specific estimates |
Record the source and date of each quote. Destination guides such as our Iceland trip budget guide can help identify categories, but check current prices for your dates rather than treating an older example as a live quote.
4. Convert Foreign-Currency Costs Consistently
Use a clearly stated exchange rate and check the fees charged by your actual card, bank or currency provider. There is no single markup that applies to every traveller or payment method.
If £1 buys €1.20, a €120 booking is approximately £100 before any separate fees. Divide the euro amount by 1.20; multiplying would give the wrong result.
If your provider then charges a separate 3% transaction fee, the illustrative cost becomes £103. Do not add that fee if it is already included in the provider’s quoted total.
Use actual charged amounts for purchases you have already paid for. For unpaid costs in another currency, retain an allowance for exchange-rate changes rather than repeatedly changing the value of settled bookings.
5. Budget for Transport and Meals You Will Actually Use
Price the journey from the airport to your accommodation at your expected arrival time. A late flight might leave you needing a taxi rather than the daytime bus you found first.
For a rental car, include fuel, parking, tolls, any one-way charge and the cover you choose. For public transport, compare individual tickets with a pass based on your likely journeys rather than assuming the pass is cheaper.
For food, look at a few current menus near where you will stay. Allow for breakfast, lunch, dinner, snacks and drinks, then multiply by the number of people and spending days. Avoid budgeting for restaurant breakfasts if they are already included in your room rate.
Be honest about the holiday you want. If you are looking forward to two special dinners, price them separately instead of hoping they will fit inside a street-food allowance.
6. Get an Insurance Quote Before Finalising the Budget
Use a quote suited to your destination, trip length, travellers and planned activities. A fixed percentage of the holiday price is not a reliable substitute: premiums and cover vary.
Check exclusions, excesses, medical declarations and cancellation cover. An excess is the amount you may need to contribute to a covered claim, so consider it when deciding how much money to keep accessible.
The UK government’s travel insurance guidance recommends suitable insurance and checking the policy’s exclusions. Insurance is not a promise that every delay, lost item or changed plan will be reimbursed.
7. Use a Calculator to Check the Arithmetic
A basic calculator or spreadsheet is enough for most trip budgets. Keep the quantities visible so you can see whether a room rate has been multiplied by nights or a meal allowance by both people and days.
Another option is the Chrome extension linked under AI for solve math. Its listing describes typed and image-based maths input. You could use it to help check a calculation after collecting your quotes.
Check any result against the original figures, especially when using an image. A tool can misread a decimal point or miss that a price is per person. It cannot reliably supply missing fees or a current exchange rate unless those inputs are provided and verified. Check the extension’s current features, permissions and pricing before installing it.
A Worked Trip Budget: Two People, Five Nights
The figures below are invented to demonstrate the method, not destination prices. All amounts are in US dollars, cover two travellers and assume six spending days. The accommodation figure includes its applicable taxes and mandatory fees.
| Expense | Calculation | Group total |
|---|---|---|
| Return flights | $299 × 2 people | $598 |
| Flight extras | $40 per person for the whole return trip × 2 | $80 |
| Accommodation | $120 per shared room × 5 nights | $600 |
| Airport transfers | $35 per shared journey × 2 | $70 |
| Local transport | $10 per person × 6 days × 2 people | $120 |
| Food and drink | $40 per person × 6 days × 2 people | $480 |
| Activities | $75 per person × 2 | $150 |
| Insurance | Illustrative quote for both travellers | $80 |
| Mobile data and other small costs | Combined allowance | $40 |
| Estimated spending | Sum of the categories above | $2,218 |
| Contingency allowance | $2,218 × 10% | $221.80 |
| Total budget | $2,218 + $221.80 | $2,439.80 |
| Per person if split equally | $2,439.80 ÷ 2 | $1,219.90 |
The example assumes no additional visa, equipment, pet-care or airport-parking costs. Add those where relevant. The contingency is money set aside, not spending that is certain to occur.
Choose a Buffer and Track What Remains to Pay
A 10% contingency is a starting assumption for this example, not a guarantee that every unexpected expense will fit. A trip with uncertain transport, remote stops or substantial unpaid foreign-currency costs may need a different allowance.
Track three figures separately: total estimated cost, money already paid and the remaining budget. In the example, if you have paid the $598 flights and $600 accommodation, the remaining budget including contingency is $1,241.80.
Keep refundable deposits and card holds on a separate list so you know how much cash or credit must be available, even if you expect that money to be released.
Final Checks Before You Book
- Compare travel dates and departure times, including the effect on hotel nights and transfers.
- Compare accommodation using final totals for the same occupancy and cancellation terms.
- Check per-person prices, shared costs, nights and spending days.
- Confirm what is already included in packages, passes and room rates.
- Review unpaid estimates before departure and leave settled bookings recorded at their actual cost.
Being flexible with travel dates is different from buying a flexible ticket, which may cost more. Our guide to whether it is cheaper to book flights on a Tuesday looks at another common flight-booking assumption.
Once the full budget is visible, you can make useful choices: one fewer hotel night, a different base, fewer paid tours or more time to save. That is more helpful than discovering the gap after the bookings are non-refundable.
