Circadian Rhythm & Eating Windows
Intermittent Fasting Calculator & Planner
Customize your fasting protocol (16:8, 18:6, 20:4, OMAD), calculate your exact meal times, and allocate your daily calories.
Fasting Phase (16 Hours)
20:00 → 12:00
Drink plenty of water, black coffee, or plain herbal tea. Zero calories allowed.
Eating Window (8 Hours)
12:00 → 20:00
Consume all your daily 1800 calories and hit your protein target within this window.
Suggested Meal Calorie Allocations (1800 kcal)
Meal 1: Break-Fast (Opening)12:00
720 kcal
40% of daily target
Meal 2: Afternoon Snack / Pre-WorkoutMid-Window
360 kcal
20% of daily target
Meal 3: Evening Dinner (Closing)20:00
720 kcal
40% of daily target
Frequently Asked Questions About Fasting
Everything you need to know about food nutrition, tracking, and calories.
Any calorie-containing food or drink that triggers an insulin or metabolic response breaks a fast. Water, plain black coffee, unflavored sparkling water, and plain unsweetened herbal teas do NOT break a fast.
While intermittent fasting naturally restricts your eating timeframe and often reduces overall intake, you can still overeat in an eating window. Tracking calories with Banana Vision ensures you remain in a caloric deficit.
The 16:8 protocol is the gold standard for beginners. It involves fasting for 16 hours (most of which happens during sleep) and eating all daily meals within an 8-hour window (for example, 12:00 PM to 8:00 PM).
Effortless Calorie Tracking
Track Your Meals in Your Fasting Window
When your eating window opens, snap photos of your meals in Banana Vision to make sure you hit your exact protein and calorie goals.
Instant photo AI
Voice & text logging
No barcode paywall