Scientific Fasting, Nutrition & Circadian Calculators

Eliminate the guesswork from intermittent fasting. Calculate exact eating windows, forecast multi-day water fasting weight loss, balance feeding macros, track cellular autophagy, and optimize your 90-minute REM sleep cycles with medical-grade precision.

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Intermittent Fasting Calculator

Calculate personalized 16:8, 18:6, or OMAD schedules with exact eating windows and macro splits.

100% Free & Unlimited 16:8, 18:6, 20:4, OMAD Autophagy Phase Tracker No Signup Required

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Complete Fasting & Wellness Suite

6 Scientific Tools Ready

Intermittent Fasting Meal Planner

Build customized feeding window meals balanced with precise macronutrients and calorie targets.

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Intermittent Fasting Timer

Live interactive countdown clock for tracking fasting states, ketosis transitions, and feeding alerts.

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Daily Water Intake Calculator

Compute baseline hydration targets based on body weight, climate temperature, and physical activity.

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Water Fasting Weight Loss Calculator

Forecast daily fat loss, water weight drops, and metabolic shifts during extended water fasts.

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Sleep Cycle Calculator

Align wake times and bedtimes with 90-minute REM sleep cycles to wake up completely refreshed.

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