Unit Converter
Convert length, weight, temperature, volume and area units instantly. Switch between metric and imperial units for travel, cooking, school, work and everyday calculations.
Convert from
Enter a value and choose the unit you want to convert from.
Quick unit conversion examples
Length conversions
Convert meters, kilometers, centimeters, millimeters, miles, yards, feet and inches. Useful for travel, construction, fitness and map distances.
Weight and volume
Convert kilograms, grams, pounds, ounces, liters, milliliters, gallons, quarts, pints and cups. Helpful for cooking, shipping and everyday measurements.
Temperature conversions
Temperature conversions use formulas instead of simple multiplication because Celsius, Fahrenheit and Kelvin have different zero points.
Common unit conversion mistakes
Using the wrong direction
Kilometers to miles and miles to kilometers use different factors. Always check which unit you are converting from and to.
Treating temperature like length
Celsius to Fahrenheit is not a simple multiplication. It also includes an offset of 32.
Rounding too early
Rounding is fine for everyday use, but for technical work it is better to keep more precision until the final result.
Free online unit converter
This unit converter helps you convert between common units of measurement quickly and easily. It supports length, weight, temperature, volume and area conversions, including both metric and imperial units.
Use it for travel planning, school work, cooking, fitness, construction, DIY projects, shipping, science, engineering and everyday measurement conversions.
Metric vs imperial units
Most countries use the metric system, while imperial and US customary units are still common in some contexts. This is why conversions such as kilometers to miles, kilograms to pounds and Celsius to Fahrenheit are still useful.
Want the bigger picture behind these systems? Read our Metric vs Imperial Units guide.
Unit Converter FAQ
What units can I convert?
You can convert length, weight, temperature, volume and area units.
How do unit conversions work?
Most conversions use a conversion factor. Temperature conversions use formulas because temperature scales have different zero points.
Can I convert metric to imperial units?
Yes. The converter supports common metric and imperial conversions such as kilometers to miles, kilograms to pounds and Celsius to Fahrenheit.
Why does temperature conversion work differently?
Celsius, Fahrenheit and Kelvin do not share the same zero point, so temperature conversion requires addition or subtraction as well as multiplication.
Is this converter private?
Yes. The conversion happens locally in your browser.
Is this unit converter free?
Yes. It is free and does not require signup.