Project name: https://roadmap.sh/projects/unit-converter

The user can input a value to convert, select the units to convert from and to, and view the converted value.
Units of measurement to convert between:

Length: millimeters, centimeters, meters, kilometers, inches, feet, yards, miles.  

Weight: milligram, gram, kilogram, ounce, pound.  

Temperature: celsius, fahrenheit, kelvin.