back-of-the-envelope calculator for system design

[RajanMehta]

Recently, I built a quick utility to solve this one friction point I’ve always hated: Back-of-the-envelope math during system design. Converting between natural language and usable units (“wait, how many requests per second is 500 million per month?”) eats into time I’d rather spend on actual design decisions (especially during an interview).

It’s simple, but it’s been a massive help for me so I wanted to share it. I just type expressions the way I think, and it instantly returns results in usable units, all thanks to Pint!

Access the app here: https://back-of-the-envelope.streamlit.app/
Examples in Readme: https://github.com/RajanMehta/back-of-the-envelope