Unit Converter
📏

Free Unit Converter

Length, weight, temp, volume & more

Kilometers
0.001

How to Use

  1. 1

    Select the measurement category - length, weight, temperature, volume, speed, area, or data storage.

  2. 2

    Enter a value and select the source unit from the dropdown.

  3. 3

    All equivalent values in other units are shown instantly. Select a different output unit to focus on a specific conversion.

Frequently Asked Questions

What units can I convert? ▼
The converter covers seven measurement categories. Length: meters, centimeters, millimeters, kilometers, inches, feet, yards, miles, nautical miles. Weight: kilograms, grams, milligrams, metric tons, pounds, ounces, stones. Temperature: Celsius, Fahrenheit, Kelvin. Volume: liters, milliliters, cubic meters, US gallons, UK gallons, fluid ounces, US cups, teaspoons, tablespoons. Speed: km/h, mph, meters per second, knots. Area: square meters, square feet, square inches, acres, hectares, square kilometers, square miles. Data storage: bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes.
Is the conversion accurate? ▼
Yes. All conversions use exact mathematical formulas and internationally defined conversion factors. For example, 1 inch is defined as exactly 25.4 millimeters. 1 pound is exactly 0.45359237 kilograms. Results are displayed with sufficient decimal places to be practically accurate for any everyday use case. Temperature conversions use the correct non-linear formulas rather than approximations, ensuring results are accurate across the full range of values.
Can I convert temperature? ▼
Yes. The tool converts between Celsius (the international standard used in most countries), Fahrenheit (standard in the United States and a few other countries), and Kelvin (the SI unit of thermodynamic temperature used in science). Temperature conversion uses the exact formulas: Fahrenheit = (Celsius x 9/5) + 32, and Kelvin = Celsius + 273.15. Common conversions include body temperature (37°C = 98.6°F), water boiling point (100°C = 212°F), and absolute zero (0K = -273.15°C).
Why do some units not appear in every category? ▼
Each category contains the most commonly used units for that measurement type. For example, the length category includes both metric units (mm, cm, m, km) and imperial units (in, ft, yd, mi) because both systems are in widespread use globally. Less common or highly specialised units are not included to keep the interface clean and focused on practical everyday conversions.

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About this Tool

Unit conversion is a constant need in everyday life, education, science, cooking, travel, and engineering. Different countries use different measurement systems - the United States uses the imperial system while most of the world uses metric - and switching between them is a frequent source of confusion and errors. This unit converter handles the seven most commonly needed measurement categories: length, weight, temperature, volume, speed, area, and data storage. All conversions are calculated using exact, internationally defined conversion factors and formulas. The tool works entirely in your browser with no data sent to any server, and results update instantly as you type.