Unit Converter

The metric system (SI) is used by most countries and is based on powers of 10, making conversions straightforward. Units include metre (length), kilogram (weight), and litre (volume). The imperial system, used primarily in the USA, uses units like feet, pounds, and gallons with irregular conversion factors. For example, 1 foot = 12 inches, 1 mile = 5,280 feet.

To convert from Celsius to Fahrenheit: multiply by 9/5 and add 32. Formula: °F = (°C × 9/5) + 32. Example: 20°C = (20 × 1.8) + 32 = 68°F. To convert Fahrenheit to Celsius: subtract 32 and multiply by 5/9. Formula: °C = (°F − 32) × 5/9. Body temperature is 37°C = 98.6°F.

1 pound = 0.4536 kg. 1 kg = 2.2046 pounds. To convert pounds to kg, multiply by 0.4536. To convert kg to pounds, multiply by 2.2046. For example, 10 kg = 22.05 lbs, and 150 lbs = 68.04 kg.

A gigabyte (GB) in the SI definition = 1,000,000,000 bytes (10^9). A gibibyte (GiB) = 1,073,741,824 bytes (2^30). Storage manufacturers use GB (decimal), but operating systems often report storage using GiB (binary), which is why a "500 GB" hard drive shows as roughly 465 GB in Windows. Our tool supports both definitions.

1 mph = 1.60934 km/h. To convert mph to km/h, multiply by 1.60934. To convert km/h to mph, divide by 1.60934 (or multiply by 0.62137). Example: 60 mph = 96.56 km/h. The speed of light is approximately 186,000 mph or 300,000 km/s.

1 knot = 1 nautical mile per hour = 1.852 km/h = 1.151 mph. Knots are used in maritime navigation and aviation because nautical miles are directly related to degrees of latitude on Earth. 1 nautical mile = 1,852 metres.