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
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Elapsed
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Remaining
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Press Start to begin tracking. The body stage guide will appear here as your fast progresses.
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
No completed sessions yet. Your last 7 sessions will appear here.
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.