Convert between units of length, weight, temperature, volume, speed, area, data, and time.
1 mm =
0.00000100000 km
1 mm = 0.00000100000 km
The metric system (International System of Units) is used by the vast majority of countries worldwide. It is based on powers of ten, making conversions between units straightforward. For example, 1 kilometer equals 1,000 meters, and 1 kilogram equals 1,000 grams.
The imperial system is primarily used in the United States, Liberia, and Myanmar. It uses less intuitive conversion factors such as 12 inches in a foot, 3 feet in a yard, and 5,280 feet in a mile. Converting between metric and imperial requires specific conversion factors that this tool handles automatically.
Whether you are working on an international project, following a recipe from another country, or calculating shipping dimensions, this converter eliminates manual math and potential errors.
Some conversions come up frequently in daily life and professional work. For length, 1 mile equals approximately 1.609 kilometers, and 1 inch equals exactly 2.54 centimeters. For weight, 1 pound equals about 0.454 kilograms, and 1 ounce is roughly 28.35 grams.
Temperature conversion is less intuitive because it involves both multiplication and addition. Water freezes at 0 degrees Celsius (32 degrees Fahrenheit) and boils at 100 degrees Celsius (212 degrees Fahrenheit). The Kelvin scale starts at absolute zero (-273.15 degrees Celsius) and is used primarily in scientific contexts.
For speed, 1 mile per hour equals approximately 1.609 kilometers per hour. A knot, used in aviation and maritime navigation, equals 1.852 kilometers per hour or about 1.151 miles per hour.
Digital data is measured in bits and bytes. A bit is the smallest unit of data, representing a single binary value (0 or 1). A byte consists of 8 bits and can represent a single character of text.
The standard decimal prefixes follow powers of 1,000: 1 kilobyte (KB) equals 1,000 bytes, 1 megabyte (MB) equals 1,000 KB, 1 gigabyte (GB) equals 1,000 MB, 1 terabyte (TB) equals 1,000 GB, and 1 petabyte (PB) equals 1,000 TB. Note that some systems use binary prefixes (kibibyte, mebibyte) where each step is 1,024 instead of 1,000. This tool uses the standard decimal (SI) definitions.
Understanding these units is essential when evaluating storage capacity, internet bandwidth, and file sizes.
Cooking measurements often differ between countries. US recipes use cups, tablespoons, and teaspoons, while most other countries use milliliters and grams. One US cup equals approximately 236.6 milliliters. One tablespoon equals about 14.8 milliliters, and one teaspoon equals roughly 4.9 milliliters.
US gallons and UK (imperial) gallons are not the same size. A US gallon equals 3.785 liters, while a UK gallon equals 4.546 liters. A US fluid ounce equals about 29.6 milliliters, compared to 28.4 milliliters for a UK fluid ounce.
When following recipes from different regions, always check whether the measurements are US or imperial, and use a converter like this one to ensure accurate results. Precision matters in baking, where small measurement errors can significantly affect the outcome.
To convert Celsius to Fahrenheit, multiply the Celsius temperature by 9/5 and then add 32. For example, 25 degrees Celsius equals (25 x 9/5) + 32 = 77 degrees Fahrenheit. This tool does the calculation automatically as you type.
A US gallon equals 3.785 liters, while a UK (imperial) gallon equals 4.546 liters. The UK gallon is about 20% larger than the US gallon. This difference is important when following recipes, calculating fuel economy, or comparing product volumes across countries.
Yes. All conversions are calculated entirely in your browser using JavaScript. No data is sent to any server. Once the page has loaded, you can use the converter without an internet connection.
The conversion factors used in this tool are based on internationally recognized standards. Results are displayed with up to 6 significant figures. For most practical purposes, the precision is more than sufficient. For scientific work requiring higher precision, consult the specific standard definitions for each unit.
A nautical mile is a unit of distance used in maritime and air navigation. It equals exactly 1,852 meters or approximately 1.151 statute miles. One nautical mile corresponds to one minute of latitude on the Earth's surface, which makes it particularly useful for navigation with charts and maps.
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