Simple calculation without plugins

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Hello!

Disclamer, I have terrible, abysmal development language knowledge. So what I’m trying to do may seem so simple to more knowledgeable folks that it doesn’t make sense, but please bare with me.

I’m trying to make a simple landing page that only shows a static calculator : people enter a number in a field, it spits out the result after a simple division. Inputs are always divided by the same number, and there’s only one input field.

For example, the visitor enters 43, it is divided by 7, the rounded result shows up in real time under the input field, with some text next to it (“congrats, you’re 6.14 years old in dog years!”).

I’ve been looking around, and every html tutorial is either to create a full blown calculator, or requires to create a new page with some php code, or just redirects to plugins (which I don’t want).

Is there a simple solution to my problem?

Thanks a bunch!

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