Travel & Geography

Calculate the great-circle distance between two cities using the Haversine formula. 34 major cities included, or enter custom coordinates.

Generate a packing checklist from your trip duration, trip type, and season. Covers clothing, documents, and type-specific essentials.

Check plug type, voltage, and frequency for any country and whether you need an adapter or a voltage converter.

Find the typical tipping rate, local etiquette, and rounding custom for restaurants in any country before you travel.

Estimate jet lag severity and recovery time from the number of time zones crossed and flight direction.