Unit Converter

A few handy length conversions come up frequently in everyday life. One inch equals 2.54 centimeters exactly. One mile is approximately 1.609 kilometers, so a quick estimate is to multiply miles by 1.6. One meter is about 3.28 feet, or just over a yard. For height, 5 feet 10 inches is about 178 centimeters. Marathon runners often need to convert between miles and kilometers — a 5K is 3.1 miles, a 10K is 6.2 miles, and a full marathon at 42.195 kilometers is 26.2 miles. This tool handles all these conversions instantly so you do not need to memorize the formulas.

Temperature conversion between Fahrenheit and Celsius trips people up because it involves both multiplication and an offset. The exact formula is C = (F - 32) x 5/9, but a quick mental shortcut is to subtract 30 and divide by 2 for a rough estimate. Some useful reference points: 0°C is 32°F (freezing point of water), 100°C is 212°F (boiling point), 37°C is 98.6°F (body temperature), and 20°C is 68°F (comfortable room temperature). Kelvin is used primarily in science and starts at absolute zero (-273.15°C). This tool converts between all three scales accurately.

Digital storage units can be confusing because of the difference between binary and decimal definitions. This tool uses binary units where 1 kilobyte equals 1,024 bytes, 1 megabyte equals 1,024 kilobytes, and so on. Hard drive manufacturers often use decimal units where 1 GB equals 1 billion bytes, which is why a drive advertised as 1 TB shows about 931 GB in your operating system. For everyday reference, a typical photo is 3-5 MB, a song is about 3-10 MB, an hour of HD video is roughly 2-4 GB, and a full-length movie in 4K can be 20-100 GB depending on compression.