Unit Converter for International Travel: Distance, Temperature & Currency

September 5, 2026 · 4 min read

Traveling internationally means constantly converting between measurement systems. Speed limits are in km/h, weather is reported in Celsius, luggage limits are in kilograms, and distances are in kilometers. Having quick conversion reference saves time and prevents costly mistakes.

Distance and Speed

1 kilometer = 0.621 miles. 1 mile = 1.609 kilometers. For quick estimates: multiply km by 0.6 to get miles, or multiply miles by 1.6 to get km. Speed limits: 100 km/h = 62 mph, 120 km/h = 75 mph, 130 km/h = 81 mph. These rough conversions keep you legal on foreign highways.

Temperature

Celsius to Fahrenheit: multiply by 1.8 and add 32. For quick estimates: double the Celsius number and add 30. So 20°C ≈ 70°F, 25°C ≈ 80°F, 30°C ≈ 86°F. Key reference points: 0°C = 32°F (freezing), 100°C = 212°F (boiling), 37°C = 98.6°F (body temperature).

Weight and Luggage

1 kilogram = 2.205 pounds. Most international airlines allow 23 kg (50.7 lbs) for checked bags and 7-10 kg (15-22 lbs) for carry-on. Knowing your luggage weight in both systems prevents overweight fees — which can be $50 to $200 per bag.

Practical Travel Tips

Download a converter app for offline use — you will not always have internet. Learn a few key conversions by heart for the country you are visiting. For fuel, 1 gallon = 3.785 liters. Fuel prices in Europe are per liter, so multiply by 3.8 to compare with US per-gallon prices. A $1.50/liter price in Europe is about $5.70 per gallon.

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Also useful: our Percentage Calculator for related calculations.