About Simple Time Tools

Simple Time Tools is a free collection of 25 clocks, timers, and time-math calculators that run entirely in your web browser. There's nothing to install, no account to create, and no files to upload — every calculation, from a stopwatch lap to a sleep-cycle estimate, happens locally on your own device using plain JavaScript.

We built this because most "time tool" sites bury a simple calculator under logins, pop-ups, or app downloads. Here, you open a page and the tool just works.

The site is free to use and supported by advertising (via Google AdSense) rather than subscriptions or paywalls. Ads help cover hosting costs so the tools can stay free for everyone.

Have a tool idea or found a bug? We're always adding new calculators based on what people actually need.