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⏰Intermittent Fasting Window Calculator

HH:MM 24-hodinový formát

What is Intermittent Fasting Calculator?

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Intermittent fasting (IF) cycles between periods of eating and fasting. The most common protocols are 16:8 (fast 16 hours, eat within 8-hour window), 18:6, and 5:2 (two 500-600 kcal "fast days" per week). Benefits include improved insulin sensitivity, metabolic flexibility, and appetite regulation.

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How to Intermittent Fasting Calculator

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  1. 116:8: stop eating at 8pm → break fast at noon the next day
  2. 2Time-restricted eating aligns feeding with circadian biology
  3. 3Autophagy (cellular cleanup) accelerates after 16–24 hours of fasting
  4. 4Fasting insulin drops significantly after 12–14 hours without food

Worked Examples

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Example 1
Given:Last meal 8pm · 16:8 protocol
Výsledok:Break fast at 12:00 next day · Eating window 12:00–20:00

Coffee/tea/water allowed during fasting window

IF protocols comparison

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ProtocolFasting durationDifficulty
12:1212 hoursEasy
14:1014 hoursEasy-moderate
16:816 hoursModerate
18:618 hoursHarder
OMAD (one meal)23 hoursHard
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Did you know?

A 2022 NEJM review found time-restricted eating reduced HbA1c by 0.91% in type 2 diabetes — comparable to some medications — without calorie counting.

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Reviewed October 2026
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