Travel turns ordinary math into hostile math — currencies, time zones, baggage, taxes and tips, all in unfamiliar units.
If you have ever stared at a number on a form and wondered where it came from, you are not alone. Travel turns ordinary math into hostile math — currencies, time zones, baggage, taxes and tips, all in unfamiliar units.
Quick mental check before paying anywhere.
Avoid waking colleagues at 3am with calendar invites.
Worth claiming on goods over the threshold in EU/UK.
Local norms vary wildly — Japan tips zero, US expects 18–20%.
Penalty fees can exceed ticket price.
Walking time between airport gates.
Fuel + tolls for any road trip.
Helpful when picking flight class for long flights.
Plan landing-day naps to beat jet lag.
What's the best app for travel math? Specialised online calculators beat all-in-one apps for accuracy.
How do I avoid jet lag? Shift your sleep schedule 1–2 hours per day in the days before a long flight.
The math is the easy part. Acting on what it tells you is where the real win lives.