Advice on Language for Engineering Applications

Hello Everyone,

I would like to build a web interface that performs engineering calculations. At the moment, I am familiar with doing this using Python scripts. But I would like to make my scripts web based.

My intention is to learn React.js to make these scripts interactive on a website, ie, when the user updates, say the pipe outer diameter or pipe weight, everything gets recalculated automatically.

My question to the group is does React.js have a strong mathematical library that can do all the complex calculations when compared to say numpy in Python?

My main aim is to build an engineering website and I would like your advice on whether React.js is suitable or I should focus on another language that has the mathematics library and is also web friendly.

Thank you.
Regards,
Kenneth.