Ultimate Optimal Fasting Window Calculator for Free

Optimal Fasting Window Calculator

Circadian Optimizer

Your Schedule

eTRF Strategy: This tool aligns your eating window with daylight hours, which studies suggest optimizes insulin sensitivity and sleep quality.

Ready to Optimize?

Select your preferred protocol and wake-up time to generate your personalized Circadian Rhythm schedule.

FAQ & Science

What is Circadian Rhythm Fasting (eTRF)?

Early Time-Restricted Feeding (eTRF) aligns your eating window with your body's natural 24-hour clock. Consuming calories primarily in the morning and early afternoon—when insulin sensitivity is highest—can improve metabolic health compared to eating late at night.

Why Wake Time?

Your wake time anchors your internal "master clock." Eating 2-3 hours after waking allows cortisol levels to stabilize, preparing your metabolism for nutrient processing.

Shift Workers

If you work nights, alignment is harder but crucial. Aim to keep your eating window consistent relative to your active period and avoid bright light during your sleep phase.

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