Most travel budget spreadsheets die by day four of a trip, not because the traveler gave up on budgeting, but because the system itself was too elaborate to maintain during actual travel days. The fix is a system built for exhaustion, not for a spreadsheet enthusiast at home.
Log the number, not the analysis
At the end of each day, open a notes app and type one line: date, total spent in local currency, one-word category if you have the energy. That's it. Analysis happens later, at home or on a rest day — not in real time on a travel day.
Convert currency weekly, not per-purchase
Doing currency math on every purchase is exhausting and error-prone. Instead, look up the conversion rate once a week and apply it in a batch to that week's local-currency total. It's accurate enough for budgeting purposes and dramatically less draining.
Set one weekly check-in, not daily anxiety
Rather than stressing daily about whether you're on budget, pick one day a week (a rest day or a travel day works well) to compare actual spending against your planned budget and adjust the coming week if needed.
Takeaway: A one-line daily log plus a weekly review beats an elaborate real-time spreadsheet every time — the goal is a system you'll still be using on day 30, not day 4.