[Aspos]

This is great. I want this as an addon to JS and Python.

[seanos]

For Python, there is the Pint library: https://pint.readthedocs.io/en/stable/

[jsiva]

Another python alternative that work well with numpy arrays is astropy.units (also mentioned on the pint website):

https://docs.astropy.org/en/stable/units/