Unit Converter
Convert between different units of measurement
Free Online Unit Converter
Convert between different units of measurement instantly with our comprehensive free online unit converter. Whether you need to convert kilometers to miles, kilograms to pounds, Celsius to Fahrenheit, or any other unit conversion, our tool provides accurate results with just a few clicks.
Our converter supports seven major measurement categories: length, weight, temperature, volume, area, speed, and digital storage. Each category includes both metric and imperial units, making it useful for users worldwide regardless of which measurement system they commonly use.
All conversions are calculated instantly as you type, with bidirectional input allowing you to convert in either direction. The swap button lets you quickly reverse your conversion. All processing happens locally in your browser with no data transmitted to any server.
Supported Unit Categories
Length
Meters, kilometers, centimeters, millimeters, miles, yards, feet, inches
Weight / Mass
Kilograms, grams, milligrams, pounds, ounces, metric tons, stone
Temperature
Celsius, Fahrenheit, Kelvin with accurate conversion formulas
Volume
Liters, milliliters, gallons, quarts, pints, cups, fluid ounces, cubic meters
Area
Square meters, square kilometers, square feet, square yards, acres, hectares
Speed
Meters/second, kilometers/hour, miles/hour, knots, feet/second
Digital Storage
Bytes, kilobytes, megabytes, gigabytes, terabytes, bits, kilobits, megabits
Who Uses Unit Converters?
International Travelers
Convert miles to kilometers, Fahrenheit to Celsius, and gallons to liters when traveling abroad.
Students & Teachers
Solve physics, chemistry, and math problems requiring unit conversions for homework and exams.
Engineers & Scientists
Convert between metric and imperial units for technical calculations and international projects.
Cooks & Bakers
Convert recipe measurements between cups, milliliters, ounces, and grams for cooking.
Fitness Enthusiasts
Convert body weight between pounds and kilograms, track running distances in preferred units.
IT Professionals
Convert file sizes and data transfer rates between bytes, megabytes, gigabits, and more.
Frequently Asked Questions
How accurate are these conversions?
Our conversions use precise conversion factors. Results are displayed with up to 10 significant figures, then trailing zeros are removed for cleaner output.
Why are there different gallon sizes?
The US gallon (3.785 liters) and Imperial gallon (4.546 liters) differ. Our converter uses US measurements by default, which is most common internationally.
How does temperature conversion work?
Temperature uses formulas, not simple multiplication. Celsius to Fahrenheit: °F = (°C × 9/5) + 32. Celsius to Kelvin: K = °C + 273.15.
What is the difference between KB and Kb?
KB (kilobytes) measures storage (8 bits = 1 byte). Kb (kilobits) measures data transfer speed. 1 KB = 8 Kb. Our converter includes both.
Are metric or imperial units more accurate?
Both systems are equally precise. Metric is based on powers of 10, making mental math easier. Imperial units are traditional in the US, UK, and a few other countries.
Can I convert between different categories?
No, you can only convert within the same category (length to length, weight to weight, etc.). Converting between categories like length to weight is not physically meaningful.