Fasting Calculator
Free Fasting Calculator to track your intermittent fasting progress. Know your current fasting phase, time elapsed, remaining time, and end time.
About This Calculator
Track your intermittent fasting journey. Enter when you started fasting and how long you plan to fast to see your current phase and remaining time.
Frequently Asked Questions
What are the phases of fasting?
Fed state (0-4h): Digesting nutrients. Early fasting (4-12h): Glycogen depletion begins. Ketosis (12-18h): Body burns fat for fuel. Deep ketosis (18-24h): Increased fat burning, mental clarity. Autophagy (24h+): Cellular repair and recycling processes begin.
What is the 16/8 fasting method?
16/8 intermittent fasting involves fasting for 16 hours and eating within an 8-hour window. For example, eat from 12 PM to 8 PM, then fast from 8 PM to 12 PM next day. This is the most popular and sustainable IF method.
What is autophagy?
Autophagy is the body's cellular cleaning process that begins around 18-24 hours of fasting. It removes damaged cells and regenerates new ones, potentially reducing inflammation, slowing aging, and protecting against neurodegenerative diseases.
Can I drink water while fasting?
Yes, water, black coffee (no sugar/cream), and unsweetened tea are allowed during fasting. They don't break autophagy or ketosis. Avoid anything with calories, including milk, sugar, artificial sweeteners, and even some zero-calorie drinks.