Should I use Google Sheets or Excel?

Google Sheets. It's free, automatically saves, and you can access it from your phone when you're out shopping for trip gear. Excel works fine if you already have it, but the cloud access matters more than you think.

How detailed should I get with categories?

Detailed enough that you can see where money is actually going. 'Food' is not detailed enough. 'Breakfast,' 'lunch,' 'dinner,' and 'snacks' shows you that you're spending 40 dollars a day on coffee and pastries. That level of detail changes behavior.

What if I'm traveling with someone else?

Add a column for who paid and another for split amounts. Create a settling-up tab that tracks who owes whom. Update it as you go. Money ruins more trips than bad weather. Track it clearly.

Do I really need a buffer percentage?

Yes. 15% minimum. Things cost more than you think. Baggage fees you didn't expect. The hostel that charges extra for linens. The museum that's cash-only. The train you miss. If you don't use the buffer, great. You come home with extra money.

When should I stop updating it?

Never during the trip. Update your actual spending daily. When you get home, add a final tab comparing budgeted versus actual costs by category. This becomes your template for the next trip. You'll get better at budgeting every time.

How to Build a Pre-Trip Budget Spreadsheet

A pre-trip budget spreadsheet tracks what you need to save, what you're actually saving, and where your trip money is going before you leave. Build one with three tabs: savings tracker, pre-trip expenses, and trip budget. Update it weekly until departure.

Set up your savings tracker tab. Create columns for date, deposit amount, running total, and goal percentage. Add your target amount at the top. This tab shows you exactly how much you've saved and how much further you need to go. Update it every time you move money into your trip fund.
Build your pre-trip expenses tab. List every expense you'll pay before departure: flights, accommodation deposits, visa fees, travel insurance, vaccinations, gear purchases. Add columns for budgeted amount, actual cost, date paid, and confirmation number. This becomes your receipt tracking system. Mark items as paid or pending.
Create your trip budget tab. Break down your daily spending budget by category: accommodation, food, transport, activities, miscellaneous. Multiply by number of days. Add your pre-trip total from tab two. This is your complete trip cost. Add a 15-20% buffer for things that go wrong.
Add a weekly savings target calculation. Count weeks from today until your trip. Divide remaining amount needed by weeks left. That's your weekly savings target. When you miss a week, the number goes up. When you add extra, it goes down. This number keeps you honest.
Set up automatic tracking. Add formulas that calculate totals, remaining balances, and percentage complete. Use conditional formatting to highlight overbudget items in red. Set a calendar reminder to update the spreadsheet every Sunday. The spreadsheet only works if you actually use it.

Should I use Google Sheets or Excel?: Google Sheets. It's free, automatically saves, and you can access it from your phone when you're out shopping for trip gear. Excel works fine if you already have it, but the cloud access matters more than you think.
How detailed should I get with categories?: Detailed enough that you can see where money is actually going. 'Food' is not detailed enough. 'Breakfast,' 'lunch,' 'dinner,' and 'snacks' shows you that you're spending 40 dollars a day on coffee and pastries. That level of detail changes behavior.
What if I'm traveling with someone else?: Add a column for who paid and another for split amounts. Create a settling-up tab that tracks who owes whom. Update it as you go. Money ruins more trips than bad weather. Track it clearly.
Do I really need a buffer percentage?: Yes. 15% minimum. Things cost more than you think. Baggage fees you didn't expect. The hostel that charges extra for linens. The museum that's cash-only. The train you miss. If you don't use the buffer, great. You come home with extra money.
When should I stop updating it?: Never during the trip. Update your actual spending daily. When you get home, add a final tab comparing budgeted versus actual costs by category. This becomes your template for the next trip. You'll get better at budgeting every time.