What this calculator does
A trip budget goes wrong most often because two very different kinds of money get mixed together: costs that grow with every extra day, and costs you pay once no matter how long you stay. This calculator keeps them apart. You enter what one person spends on a typical day, what one person pays to get there and back, and how much cushion you want. It returns a total, a per-person figure, a daily spending allowance and a table showing which line drives the result. It does not look up fares, hotel rates or exchange rates, and it never guesses them for you. Every number comes from you, which is exactly why the output is useful for planning: you can see what your own assumptions add up to.
The formula, step by step
- Daily cost per person = lodging + food + transport/activities
- Daily subtotal = daily cost per person x days x travelers
- One-time subtotal = round-trip transport per person x travelers
- Base budget = daily subtotal + one-time subtotal
- Contingency = base budget x reserve percentage, and total budget = base budget + contingency
- Per person = total budget / travelers
- Daily spend per person = daily cost per person x (1 + reserve percentage). This is a local-spending figure and deliberately excludes the one-time transport cost, so you can use it as a day-by-day limit.
The reserve is applied to the whole base budget, flights included, because delays, rebooking fees and fare changes are part of what a reserve is for. If your tickets are already paid and fixed, lower the percentage, since the remaining uncertainty sits in the daily spending.
Worked example 1: two travelers, five days
Two people travel for 5 days. Each plans $80 for lodging, $40 for food and $30 for local transport and activities per day, which is $150 per person per day. Each also pays $500 for round-trip transport. The daily subtotal is 150 x 5 x 2 = $1,500. The one-time subtotal is 500 x 2 = $1,000. The base budget is $2,500. With a 10% reserve of $250 the total is $2,750, or $1,375 per person. The local daily allowance per person is 150 x 1.10 = $165.
Worked example 2: a solo trip with a larger reserve
One traveler spends 7 days at $60 lodging, $35 food and $20 activities per day, which is $115 per day. Round-trip transport is $900. The daily subtotal is 115 x 7 = $805 and the base budget is 805 + 900 = $1,705. A 15% reserve adds $255.75, giving $1,960.75. A bigger reserve makes sense here because a single traveler carries every surprise alone and a long-haul fare is a large, hard-to-reverse expense.
Worked example 3: shared rooms and nights versus days
Two friends split a $120-per-night room, so lodging per person is $60 per night, not $120. If they sleep four nights but the trip covers five days of food and activities, the calculator needs one lodging number that works across all five days. Use the average: 60 x 4 / 5 = $48 per person per day. Entering $60 would overstate lodging by $12 per person per day. This nights-versus-days mismatch is the most common input error on trips that start in the morning and end in the evening.
Reference table 1: contingency reserve on a $2,500 base budget
The table uses the figures from example 1 (two travelers, base budget $2,500) and recalculates for four reserve percentages. Pick the row that matches how much uncertainty you actually face.
| Reserve | Reserve amount | Total budget | Per person |
|---|---|---|---|
| 5% | $125.00 | $2,625.00 | $1,312.50 |
| 10% | $250.00 | $2,750.00 | $1,375.00 |
| 15% | $375.00 | $2,875.00 | $1,437.50 |
| 20% | $500.00 | $3,000.00 | $1,500.00 |
There is no universal correct reserve. A short, fully prepaid trip with simple logistics can justify a small one. Travel with children, older relatives, a rental car, several connections or a volatile exchange rate can justify a larger one. Treat the percentage as a statement about your own risk, not as a standard.
Reference table 2: how trip length changes the picture
Here every traveler spends $150 per day and pays $500 for round-trip transport, with two travelers (so $1,000 is fixed). The longer the trip, the smaller the share of the budget taken by the one-time cost, and the lower the all-in cost per person per day. This is pure arithmetic, not a price forecast.
| Days | Daily costs (2 people) | One-time costs | Base budget | One-time share | All-in per person per day |
|---|---|---|---|---|---|
| 3 | $900.00 | $1,000.00 | $1,900.00 | 52.6% | $316.67 |
| 5 | $1,500.00 | $1,000.00 | $2,500.00 | 40.0% | $250.00 |
| 7 | $2,100.00 | $1,000.00 | $3,100.00 | 32.3% | $221.43 |
| 10 | $3,000.00 | $1,000.00 | $4,000.00 | 25.0% | $200.00 |
| 14 | $4,200.00 | $1,000.00 | $5,200.00 | 19.2% | $185.71 |
Making sure no cost category is missing
- Paid before you leave: transport tickets, prepaid lodging, travel insurance, visa or entry-authorization fees, tours and attraction tickets booked in advance.
- Daily local spending: meals, snacks and coffee, local transit passes or taxis, admission fees.
- Getting around the edges: airport transfers, checked-baggage fees, a local SIM or roaming plan, parking and tolls if you drive.
- Shopping and gifts: if they are not a line of their own, they silently drain the reserve.
- After you get home: card statements that post later, foreign-transaction charges, and any deposit refunds that arrive late.
The calculator has three daily inputs. Fold extra categories into the closest one rather than ignoring them, then use the breakdown table to see which line dominates. In most trips the biggest lines are transport to the destination and lodging, so a small percentage saved there beats cutting a daily coffee.
Common mistakes
- Entering the room price instead of the per-person price. Lodging is a per-person daily figure. Divide a shared room by the number of people sharing it.
- Using nights where the field expects days, or the reverse. See example 3 for the averaging trick.
- Setting the reserve to 0%. Missed connections, change fees and a lost phone are rare individually but common as a group.
- Mixing currencies. If lodging is in euros and food is in dollars, convert to one currency before typing. This page accepts one currency at a time.
- Counting the same cost twice. If a package already includes breakfast, do not also budget it under food.
Limits of this model
The calculator treats every day as an average day and every traveler as identical. It will not capture a splurge dinner, a free-lodging stay with relatives, a rental car shared by only some travelers, or a trip that crosses several currencies. In those cases run it more than once, for example one pass for the free-lodging days and one for the paid days, and add the results. The figure it returns is a planning estimate, not a quote. Real prices change with season and booking date, so confirm every large item with the provider before you rely on it.
How to use the result
- Look at the breakdown first. If one line holds well over a third of the total, that is where a different choice saves the most.
- Use the daily spend per person as a limit you can check at night, and carry the unspent amount into the next day.
- Decide where the reserve lives: a separate card or an account you do not touch for ordinary purchases.
- Re-run the calculator when a booking is confirmed and replace the estimate with the real price, so the reserve covers only what is still uncertain.
- Press Copy result to paste the figures into a message or a shared planning document.
Related tools
- Travel Packing Checklist for what to bring once the budget is settled
- Currency Converter to translate a price you saw abroad into your own currency
- Dutch Pay Calculator to split shared costs after the trip
- Tip Calculator for restaurant gratuities where tipping is customary
Frequently Asked Questions
Should I include currency exchange fees?
This calculator has no separate exchange-fee field. If you buy foreign currency or pay by card abroad, estimate the fee from your bank or card provider's own terms and add it to your daily food or activity figure, or raise the reserve percentage to cover it.
Can I enter the total lodging cost for the whole group?
No. Daily costs are per person and are multiplied by the number of travelers. For a shared room, divide the room price by the number of people who share it and enter that figure.
What reserve percentage should I choose?
There is no official standard. Use Reference table 1 to compare a few percentages and choose the one you could actually absorb. More uncertainty, such as children, a rental car or an unfamiliar destination, is a reason to choose a higher number.
Why is the daily spend per person different from my total divided by days?
The daily figure covers only day-by-day costs plus the reserve. It leaves out the one-time transport cost on purpose, so you can use it as a spending limit while you are there. The per-person total includes everything.
Does it work for a currency other than dollars?
Yes. The arithmetic does not depend on the currency, so enter all amounts in one currency. The dollar sign shown in the results is only a label.
This tool is a planning aid based on numbers you enter. It does not check prices or exchange rates and is not financial advice.