Simplicalcs is a collection of free, browser-based calculators built for people who need a quick, reliable answer without the faff. No sign-up, no paywall, no data sent anywhere — every calculation runs locally in your browser the moment you type.
The tools cover everything from BMI and mortgage repayments to salary take-home, meeting costs, and EV charging. Each one does exactly what it says, nothing more. The design is deliberately plain — generous text, plenty of space, and nothing competing with the thing you came to use.
New tools are added regularly, chosen based on where existing calculators are either confusing, untrustworthy, or simply missing something obvious.