Fasting Timer
Free intermittent fasting timers with visual progress, milestone tracking, and automatic persistence. Pick a protocol and start fasting.
Start with 16:8 — the most popular and beginner-friendly protocol. Fast for 16 hours, eat during an 8-hour window.
Press Start after your last meal. The timer tracks your progress, shows milestones (fat burning, ketosis, autophagy), and saves your state.
When the timer completes, enjoy your eating window. Eat balanced, nutrient-dense meals. During fasting, water, black coffee, and plain tea are fine.
Glycogen depleted, body switches to burning fat for energy.
Liver produces ketones. Mental clarity often improves.
Cellular cleanup accelerates. Damaged cells are recycled.
Significant cellular repair. Growth hormone surges.
Frequently asked questions
What is 16:8 intermittent fasting?
16:8 means you fast for 16 hours and eat within an 8-hour window each day. For example, eat between 12 PM and 8 PM, then fast until noon the next day. Most people skip breakfast and eat lunch as their first meal.
What can I have during a fast?
During your fasting window, you can drink water, black coffee (no sugar or cream), plain tea, and other zero-calorie beverages. The goal is to keep insulin levels low, so avoid anything with calories, artificial sweeteners, or dairy.
When does fat burning start during fasting?
After approximately 12 hours of fasting, your body depletes stored glycogen and begins burning fat for energy. By 16-18 hours, many people enter mild ketosis. This is why the 16:8 protocol is effective — it reliably gets you into the fat-burning zone.