Unit Converter
All Length Units
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Common Conversions
How to Use This Tool
Select a category from the tabs at the top: Length, Weight, Temperature, Volume, Area, Speed, Data, or Time. Each category contains all commonly used units for that measurement type.
Choose your source unit from the left dropdown and your target unit from the right dropdown. Enter a value in either field and the conversion calculates instantly. You can also click the swap button between the dropdowns to reverse the conversion direction.
Below the converter, you'll see a reference table showing your entered value converted to all available units in the selected category at once. This is helpful when you need multiple conversions quickly.
The tool supports decimal precision up to 10 significant figures. For temperature conversions, the formulas account for offset-based calculations (Celsius to Fahrenheit uses the standard formula, not a simple ratio).
All calculations run instantly in your browser with no rounding errors beyond standard floating-point precision. Common conversions like miles to kilometers, pounds to kilograms, and Fahrenheit to Celsius are always one click away.
What is Unit Conversion?
Unit conversion is the process of expressing a measurement in a different unit while preserving the same quantity. One inch equals 2.54 centimeters — the physical length doesn't change, only the number and unit used to describe it.
The need for unit conversion arises because different countries and industries use different measurement systems. The metric system (meters, kilograms, liters) is used by most of the world, while the United States primarily uses the imperial system (feet, pounds, gallons). Scientists universally use SI (International System of Units), which is based on the metric system.
Length conversions are among the most common, especially between metric and imperial. The relationship between meters and feet, kilometers and miles, or centimeters and inches comes up constantly in travel, construction, manufacturing, and everyday life.
Weight and mass conversions bridge the gap between kilograms and pounds, grams and ounces. Temperature conversion between Celsius, Fahrenheit, and Kelvin is unique because it involves both multiplication and addition (it's not a simple ratio like most other conversions).
Digital data units follow a binary-based system where each step is a factor of 1,024: bytes to kilobytes, megabytes, gigabytes, and terabytes. Understanding these conversions is increasingly important as data storage and internet speeds are part of daily decision-making.
Volume conversions can be particularly confusing because the same term can mean different quantities in different systems — a US gallon (3.785 liters) differs from an Imperial gallon (4.546 liters).