Intermittent Fasting Calculator
Daily eating window & fasting schedule planner
Fasting Metabolic Stages:
- 4-8 Hours: Insulin drops & glycogen depletion begins
- 8-12 Hours: Fat burning acceleration
- 12-16 Hours: Mild ketosis & cellular autophagy cleanup
Your Daily Schedule
Fast Breaks (First Meal)
12:00 PM (Next Day)
16 Hours Fasting Period
Eating Window:
12:00 PM – 8:00 PM (8 hrs)
Fasting Window:
8:00 PM – 12:00 PM (16 hrs)
Autophagy Begins:
8:00 AM – 12:00 PM
Frequently Asked Questions
The 16:8 method involves fasting for 16 consecutive hours every day and restricting your daily eating window to an 8-hour period (e.g. eating between 12:00 PM and 8:00 PM).
Zero-calorie beverages such as plain water, black coffee (without sugar or milk), green tea, and herbal teas are allowed and will not break your metabolic fast.
0-4 Hours: Anabolic/Digestion phase.
4-8 Hours: Blood sugar drops.
8-12 Hours: Fat burning starts.
12-16 Hours: Ketosis & Autophagy begin.
4-8 Hours: Blood sugar drops.
8-12 Hours: Fat burning starts.
12-16 Hours: Ketosis & Autophagy begin.