Free tools

Install the BedtimeCalc App

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Add the site to your home screen or desktop and use it like an app. No app store, no sign up, free, and the timers and calculators keep working offline once opened.

Install now

If your browser supports it, the button below installs the app in one tap.

TimersCountdown, stopwatch, interval, Pomodoro, kids timer and clockHealth ToolsBMI, calories, body fat, sleep habits and moreFitness ToolsWalking, running, calories burned and interval trainingBluetooth Heart Rate MonitorConnect a strap or watch and see live BPM and zones
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Android (Chrome, Edge, Samsung Internet)

  1. Open the site in Chrome.
  2. Tap the three dot menu.
  3. Tap Install app or Add to Home screen.
  4. Confirm. The BedtimeCalc icon appears with your other apps.

iPhone and iPad (Safari)

  1. Open the site in Safari. Other iPhone browsers cannot add apps.
  2. Tap the Share button (square with an arrow).
  3. Scroll and tap Add to Home Screen.
  4. Tap Add.

Bluetooth heart rate in the browser is not available on iPhone Safari. Use the free Bluefy browser if you need it.

Windows and Mac (Chrome or Edge)

  1. Open the site in Chrome or Edge.
  2. Click the install icon at the right end of the address bar, or open the menu and choose Install BedtimeCalc.
  3. The app opens in its own window and can be pinned to the taskbar or Start menu.

What works offline

After the first visit, pages you opened are saved. The countdown timer, stopwatch, interval timer, Pomodoro timer and calculators run without internet. Live items such as weather on city pages need a connection. Timers keep your screen awake while they run, if your device allows it.

Bluetooth heart rate

The Bluetooth heart rate monitor connects to chest straps and watches that broadcast heart rate. It works on Android, Windows, Mac, Linux and Chromebook with Chrome or Edge.

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Frequently asked questions

Is the app free?

Yes. It is the same website saved to your device, with no store or sign up.

Does it use storage?

Very little. Only the pages you open are saved, usually a few megabytes.

How do I remove it?

Press and hold the icon on your phone and choose Remove or Uninstall. On Windows, open the app menu and choose Uninstall.

Why is there no Install button?

Some browsers hide it. Use the browser menu steps above. On iPhone, only Safari can add apps.

Medical references: for evidence based health information see CDC Sleep and Sleep Disorders, NIH NHLBI on Sleep Deprivation, American Academy of Sleep Medicine Sleep Education and MedlinePlus. This page is general information, not medical advice.