🕌 Ramadan Mode
Ramadan Fasting Calculator
Calculate your Ramadan fasting window from Suhoor (pre-dawn) to Iftar (sunset). Ramadan typically involves 13–18 hours of fasting depending on location and time of year.
Step 1 — Choose Your Protocol
16:8 is the most popular protocol — fast 16h, eat within 8h.
Step 2 — Personalise Your Schedule
Your eating window starts from this time
🎯 Your Goal
⏱ Fasting Stages
What Happens Inside Your Body
Live biological stages during your 16-hour fast — each backed by peer-reviewed research.
Last Meal Completed
+0hYour fasting clock starts now. Digestion begins and your body processes the glucose from your last meal.
📄 Mayo ClinicDigestion Phase
+2hBlood glucose peaks and insulin is released. Your body is actively digesting and storing nutrients from the last meal.
📄 NIH — Metabolism OverviewBlood Sugar Stabilizing
+4hInsulin levels begin to drop. Blood sugar returns toward baseline. Your body shifts from storing to maintaining.
📄 PubMed — Insulin & Glucose DynamicsGlycogen Depleting
+8hLiver glycogen stores are running low. Your body begins mobilising free fatty acids as an alternative fuel source.
📄 Cahill GF Jr — NEJM 1970🔥 Ketosis Begins
+12hGlycogen stores are nearly depleted. Your liver starts producing ketone bodies from fat — your brain switches to fat-burning mode.
📄 Cahill GF Jr — NEJM 1970✨ Autophagy Activates
+16hCellular housekeeping begins. Your cells start breaking down damaged proteins and organelles — a key anti-aging mechanism.
📄 Levine & Kroemer — Cell 2008* Biological timelines are approximate and vary by individual. Sources: PubMed, NIH, Cell journal.
🕌 Using This Calculator for Ramadan
Set Your Eating Start = Iftar Time
Enter your local Iftar (sunset) time as the “eating start time”. The calculator will show your eating window from Iftar onward.
Typical Ramadan Fasting Duration
Depending on your location and the time of year, Ramadan fasting typically lasts 13–18 hours — well into the ketosis and autophagy zones.
Nutrition During Ramadan
Focus on complex carbohydrates, lean protein, and healthy fats at Suhoor for sustained energy. At Iftar, break your fast gently with dates and water before your main meal.
Medical Disclaimer
This tool provides estimates for informational purposes only. Always consult a licensed healthcare provider before beginning any fasting protocol — especially if you are pregnant, have a history of eating disorders, diabetes, or any other medical condition.
Sources: Mayo Clinic · NIH · PubMed