Intermittent Fasting · Live Tracker
Live Fasting Timer
Track your fast in real time. See exactly when your body enters ketosis, autophagy, and other key biological stages.
⏱ Live Timer
Track Your Fast in Real Time
Your progress saves automatically — even if you close this tab.
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Ready
No account needed. Your timer is saved locally in your browser.
Why Use a Fasting Timer?
Tracking your fast isn't just about counting hours—it's about understanding what's happening inside your body. Our live fasting timer shows you real-time biological milestones based on clinical research.
Instead of wondering when the benefits start, the timer will alert you when you reach key stages like glycogen depletion, ketosis, and autophagy. This makes fasting more motivating and educational.
Plus, our timer is completely private. We don't require you to create an account or download an app. Everything is saved locally on your device.
Live Timer — FAQs
How does the live fasting timer work?
The timer tracks the hours you've been fasting and shows biological milestones like ketosis and autophagy based on scientific averages. It saves your progress locally in your browser, so you can close the tab and return later without losing your timer.
Do I need an account to track my fast?
No! Our timer runs entirely in your browser and uses local storage to keep track of your time. Your data stays on your device.
When does ketosis start?
Ketosis typically begins after 12-14 hours of fasting, as your body depletes its glycogen stores and begins burning fat for energy.
When does autophagy start?
Autophagy, the body's cellular repair process, generally starts around the 16-18 hour mark and deepens as you continue fasting.
Calculate Your Fasting Window
Need to figure out when to start and stop eating? Try our calculators.
Medical Disclaimer
This tool provides estimates for informational purposes only. Always consult a licensed healthcare provider before beginning any fasting protocol — especially if you are pregnant, have a history of eating disorders, diabetes, or any other medical condition.
Sources: Mayo Clinic · NIH · PubMed