Intermittent Fasting Timer
Pick a fasting plan, press Start, and track your fasting and eating windows with a live countdown, a progress bar, and a plain-English guide to what happens in the body at each stage. Your session is saved in your browser, so a refresh will not lose it.
Current phase: Not started
Body stage timeline
- 0–4 hours: Your body is digesting your last meal. Blood sugar and insulin gradually fall.
- 4–8 hours: Digestion finishes. The body starts using stored energy and fat burning begins.
- 8–12 hours: Stored sugar (glycogen) is being used up. Many people notice hunger coming and going.
- 12–16 hours: Fat burning increases as the main energy source. Focus often improves.
- 16–24 hours: The body runs mostly on fat. Repair and cleanup processes become more active.
- 24+ hours: Extended fasting. Only continue with experience and proper care; drink plenty of water.
Recent sessions
How to use
- Choose a fasting plan or enter custom fasting hours.
- Press Start. The timer counts down your current fasting or eating window.
- Watch the progress bar and the body stage guide as hours pass.
- Press Stop to end early or Reset to clear the session. Finished sessions are recorded below.
Disclaimer
This tool provides general wellness information only and is not medical advice. Fasting is not suitable for everyone, including people who are pregnant, have diabetes, or have a history of eating disorders. Talk to a health professional before changing how you eat.
Frequently Asked Questions (FAQ)
How does the intermittent fasting timer work?
Choose a fasting plan such as 16:8 or 18:6, press Start, and the tool shows a live countdown of your current fasting or eating window with a progress bar.
Does the timer keep running if I close the page?
Yes. Your active session is saved in your browser, so refreshing or closing the page does not lose your progress.
What do the body stages mean?
The stage timeline explains in plain words what the body typically does at each fasting stage, for example digestion finishing and fat burning starting.
Is this fasting timer medical advice?
No. It provides general wellness information and estimates only. Talk to a health professional before changing how you eat.