About TeachTimer

TeachTimer is a free collection of online timers and classroom tools. We built it because the timers we found online were slow, cluttered, and hard to read from the back of a room.

What we make

• Countdown timers for every common length, from 10 seconds to 2 hours.
• A classroom timer and a visual timer designed for projectors and smart boards.
• Fair random tools: a name picker, a group generator, dice, and a coin flip.
• Short, practical guides for teachers on pacing and classroom routines.

Who is behind the site

Tomas Rivero — Founder of TeachTimer. Tomas created TeachTimer to give teachers and students fast, uncluttered timers that can go on a classroom screen without surprises. Each tool is designed and tested by Tomas, who also reviews every guide before it is published. LinkedIn profile

How we build and check our tools

• Timers follow the device clock. They calculate the time remaining from your device's clock instead of counting ticks, so they do not drift when a tab is in the background.
• Random means random. The name picker, group generator, dice, and coin use the browser's cryptographic random number generator, and every option has the same chance.
• Nothing to sign up for. There are no accounts. Class lists you type in stay in your own browser and are never sent to us.
• Tested before release. Every tool is checked by hand on desktop and phone-sized screens before it is published.

Editorial standards for our guides

• Practical first. Guides describe routines a teacher can use the same day, with specific timings.
• Sources are named. When a guide relies on research or official guidance, the source is listed at the end of the page.
• Numbers are checked. Timings, conversions, and probabilities are calculated and verified before publishing.
• Pages are dated. Each page shows when it was last reviewed. This site was last reviewed on 2026-11-11.
• Corrections are welcome. If you spot a mistake, tell us and we will fix it.

How the site is funded

The site is free to use and supported by advertising. Ads are never shown inside the timer or in full-screen mode, so nothing unexpected appears on your classroom display. Advertisers have no influence over our tools or guides. See our privacy policy for details about cookies and advertising.

Get in touch

Suggestions and corrections are welcome at hello@teachtimer.com or through thecontact page. Feedback from teachers shapes what we build next.