Free Online Unit Converter
Convert units of length, weight, temperature, and volume quickly and accurately with our free online Unit Converter. Whether you need to convert meters to feet, kilograms to pounds, Celsius to Fahrenheit, or liters to gallons, this tool gives instant results with no downloads or sign-ups required.
The calculator works directly in your browser on both desktop and mobile devices and uses reliable, standardized conversion formulas to ensure accurate results every time.
Unit Converter
Convert length, weight, temperature, and volume units instantly.
How to use the Unit Converter
Enter a value, choose the unit you want to convert from and the unit you want to convert to, and the result is calculated instantly.
You can switch between different categories using the tabs at the top of the calculator.
The converter works automatically as you type and supports both desktop and mobile devices.
Available unit categories
Length
Millimeter (mm)
Centimeter (cm)
Meter (m)
Kilometer (km)
Inch (in)
Foot (ft)
Yard (yd)
Mile (mi)
Weight
Milligram (mg)
Gram (g)
Kilogram (kg)
Tonne (t)
Ounce (oz)
Pound (lb)
Temperature
Celsius (°C)
Fahrenheit (°F)
Kelvin (K)
Volume
Milliliter (ml)
Liter (l)
Cubic meter (m³)
US gallon
UK gallon
Fluid ounce (fl oz)
Is the conversion accurate?
Yes. All unit conversions are based on internationally accepted conversion factors and formulas.
Length, weight, and volume conversions use precise linear ratios.
Temperature conversions use the correct mathematical formulas between Celsius, Fahrenheit, and Kelvin.
Results are calculated instantly in your browser without rounding errors from external services.
Can I convert between different unit types?
No. You can only convert between units within the same category (for example, length to length or weight to weight).
Does the converter work on mobile devices?
Yes. The Unit Converter is fully responsive and works on phones, tablets, and desktop computers.
Why does temperature conversion work differently?
Temperature units are not linearly related. Converting between Celsius, Fahrenheit, and Kelvin requires specific formulas, which the calculator applies automatically.
Can I swap the units?
Yes. Use the Swap button to instantly reverse the “From” and “To” units.
Can I copy the result?
Yes. Click Copy result to copy the converted value to your clipboard.
About the Unit Converter
The free online Unit Converter is a fast and easy tool for converting everyday measurement units. It’s designed for students, professionals, and anyone who needs quick and reliable conversions without installing apps or using spreadsheets.
Whether you’re converting lengths for school, weights for cooking, temperatures for travel, or volumes for work and study, this calculator provides instant results directly in your browser.
How it works
All calculations are performed locally in your browser using accurate conversion factors. No data is sent to a server, ensuring fast performance and privacy.
Why use an online unit converter?
Manual conversions are time-consuming and prone to errors. This tool eliminates guesswork and helps you get precise results in seconds.
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