Intermittent Fasting Calculator

Plan your fasting window, eating schedule, and track your progress — all in one free tool backed by science.

Set Up Your Fasting Schedule

Choose Your Fasting Method When Do You Want to Start Fasting? Your Weight (kg, optional) Primary Goal

Fasting Timer

00:00:00

Popular Fasting Methods

16:8

Skip breakfast. Eat lunch & dinner. Best for beginners.

18:6

Tighter window. Faster fat loss. Good for experienced fasters.

20:4

Warrior style. One big meal. Maximum autophagy benefits.

5:2

Normal eating 5 days. 500-600 calories on 2 days.

Learn More About Intermittent Fasting

→ What Is Intermittent Fasting? The Complete Science-Backed Guide → Intermittent Fasting Methods Compared: Which One Fits Your Lifestyle? → How to Break Your Fast Without Feeling Terrible → Frequently Asked Questions About Intermittent Fasting → Browse All Articles & Research Updates