About

My Very Calculator is a tiny collection of specialized calculators for things the built-in calculator on your phone can't do — gear ratios, LED resistors, EV charging, freelance rates, and so on.

How it works

Every calculation runs locally in your browser using vanilla JavaScript. There is no backend and no account. The first page-load downloads the HTML, a tiny CSS file, and a few small scripts — that's it.

How it stays free

The site is supported by advertising, and we use Google Analytics to see which calculators are useful so we know where to spend time. We don't sell your data and we never send the numbers you type into a calculator to any server. Full details on the privacy page.

Sharing inputs

Each calculator mirrors its current inputs into the URL hash. Copy the URL to share a particular scenario — for example, a freelance-rate conversation with a specific billable-hours assumption.