Convert length, weight, temperature, volume, area, speed and data sizes. Pick a group, type a number, and the answer updates right away.
The US uses the imperial system while most of the world uses metric — creating daily conversion needs for international travel, online shopping from UK/EU retailers, cooking with imported recipes, and working with international colleagues. The most-searched conversions in the US: miles to kilometers (road trips abroad), pounds to kilograms (medical records, shipping), Fahrenheit to Celsius (weather apps and travel), and gallons to liters (fuel efficiency comparisons).
Miles to km: multiply by 1.6 (or add 60% — 10 miles ≈ 16 km). Pounds to kg: divide by 2.2 (180 lbs ≈ 82 kg). Fahrenheit to Celsius: subtract 32, divide by 1.8 — or use the rough shortcut of subtracting 30 and halving (68°F: 68−30=38, ÷2=19, actual answer is 20°C, close enough). Gallons to liters: multiply by 3.79. Inches to cm: multiply by 2.54 (6 feet = 72 inches × 2.54 = 183 cm).