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← Intermittent fasting tools

Find a gentle starting point

Three quick steps to explore a simple routine, with safety before schedules. This is not a medical assessment.

Step 1 of 3

Safety first

Does any of this apply to you?

  • You’re under 18
  • You’re pregnant or breastfeeding
  • You have or had an eating disorder
  • You have type 1 diabetes or use insulin
  • You take medicines that depend on meal times
  • You feel unwell or are acutely ill

Questions about this tool

Is this a personal health recommendation?

No. These tools count time and share general education. They can’t tell whether fasting suits you, and longer is not better.

Which time zone does the calculator use?

Your device’s time zone. If the time you pick is later than now, it counts as yesterday. Hours are counted as elapsed time, so on a night when the clocks change the end time shifts by an hour.

Are my answers saved?

No. Everything runs in this browser; nothing is sent or stored. The countdown keeps its start time in the page address, so you can bookmark it. It doesn’t send notifications.