Simply select your category (e.g., Length), pick a metric unit like "km" in the From field, and an imperial unit like "mi" in the To field. Enter any value and the conversion happens instantly. For example, 1 km = 0.621371 mi.
The US gallon (3.785 L) and the UK/imperial gallon (4.546 L) are different units. The US gallon is about 17% smaller. Always check which gallon you need — our converter lists both as "gal (US)" and "gal (UK)" so you can pick the right one.
KB (kilobyte) uses decimal powers of 1,000 (1 KB = 1,000 bytes), while KiB (kibibyte) uses binary powers of 1,024 (1 KiB = 1,024 bytes). The difference grows with larger units — 1 GB = 1,000,000,000 bytes, but 1 GiB = 1,073,741,824 bytes.
Temperature conversions use special formulas rather than simple multiplication. Celsius to Fahrenheit: (°C × 9/5) + 32. Celsius to Kelvin: °C + 273.15. Celsius to Rankine: (°C + 273.15) × 9/5. Our converter handles all these automatically.
It depends on your region. The US uses miles per gallon (mpg US), the UK uses miles per gallon (mpg UK), and most other countries use liters per 100 kilometers (L/100km). Lower L/100km means better fuel efficiency, while higher mpg means better efficiency.