How do I calculate my fasting end time?
Quick answer
Add your fasting duration to your start time. For example, 8 PM + 16 hours = 12 PM the next day.
Step by step
01 Write down your start time.
02 Choose your target fasting hours.
03 Calculate the end time and plan your first meal.
The longer answer
Add your fasting duration to your start time. For example, 8 PM + 16 hours = 12 PM the next day. A fasting calculator is useful because most fasting questions are really time-window questions. Once the start and target duration are clear, the rest is just tracking.
Tip
Use a timer rather than redoing fasting math while hungry.
Common mistake
Guessing the end time and accidentally stretching or shortening the fast.
Track in the app
Track planned vs actual start and end times.
Safety note
Educational only. People who are pregnant, breastfeeding, under 18, have diabetes, take glucose-affecting medication, have a history of eating disorders, or feel unwell should speak with a qualified clinician before fasting.
Educational only. People who are pregnant, breastfeeding, under 18, have diabetes, take glucose-affecting medication, have a history of eating disorders, or feel unwell should speak with a qualified clinician before fasting.
