I have a confession. Every time I needed to calculate my EMI, check my BMI, or figure out how many college classes I could skip — I'd Google it, land on some site plastered with ads, get asked to sign up, and then give up halfway. So I did what any frustrated developer does.

Source: [Dev.to](https://dev.to/leena_jadhav_77feb4cbd0a8/i-built-49-free-online-tools-in-3-months-heres-what-i-learned-3p78)

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