Pairs people convert every week
- Length: kilometers ↔ miles, centimeters ↔ inches. Useful for maps in the US and road signs back home.
- Weight: kilograms ↔ pounds for luggage, gym targets, and grocery labels.
- Temperature: Celsius ↔ Fahrenheit for weather apps that disagree.
- Volume: liters ↔ US gallons, milliliters ↔ US cups for fuel and recipes.
Volume uses US liquid measures (not UK gallons). Temperature conversion is exact; the others use standard international factors.