Free fasting timer
MyFastingClock is a free, unlimited fasting timer for 16:8, OMAD, and open-ended fasts. No time caps. Not medical advice.
Before you use this clock
This is a timer and a teaching map, not a clinician. The ring measures elapsed time. It cannot see your medicines, your last meal, or whether fasting is safe for you.
Do not start unsupervised if
You are pregnant or breastfeeding, under 18, underweight, or living with an eating disorder (now or in recovery). Diabetes, kidney disease, and medicines that lower blood sugar or blood pressure also move this out of “try a window” and into a conversation with a clinician who knows you.
End the fast if
- Dizziness on standing, confusion, fainting, chest pain, or severe weakness
- A tremor or dread that is not ordinary hunger
- You take glucose-lowering medicine and feel low
- Food distress shows up: panic, numbness, or a pull toward bingeing or purging
While the clock is running
Water is the default. Black coffee or unsweetened tea are optional. Extra salt is not a performance trick, and it is unsafe with some medicines and kidney disease.
Early hunger often arrives in waves around usual meal times. A wave that eases is common. A wave plus danger signs is a stop, not a dare.
Stage badges (ketosis, autophagy window, and the rest) follow approximate hours. They are not lab results and not a reason to add more time.
- What usually ends a fast
- Hydration & electrolytes
- Hunger comes in waves
- What the stages mean
- Health disclaimer
This timer will not pretend
Other fasting clocks sell a streak, a scale, or a stage that sounds like a lab. This one measures elapsed time. The rest is a teaching map you can ignore.
No time cap is flexibility, not a dare
Open mode and multi-day presets exist so a long plan is not paywalled. They are not a ladder after 16:8. End Fast when you eat, or when you should stop.
The badge is a map, not a lab
Ketosis and Autophagy Window follow approximate hours. They do not read your blood. Two people at hour 16 can feel opposite things. The hard fact on this screen is the clock.
Wrong preset? Change mode. The start stays.
If you tapped 16:8 and meant Open, use Change mode under End Fast. Elapsed hours do not reset. The ring is a target, not a court.
No account to start. No scale. Ever.
Guest history stays on this device. Sign-in is only so the same log can live on another phone. We will not add a weight tracker. History is a map of fasts, not a kilogram board.
Questions this clock actually gets
Do I need to download an app?
No. Open this page and start. You can install it to the home screen later if you want a fuller-screen timer. That is optional.
What if I close the tab?
The running fast is saved in this browser on this device. Come back to the same site. Do not clear this site’s data. If you want the same fast on another phone, create a free account before you switch.
I started the wrong mode. Am I stuck?
No. Change mode while the fast is running. The start time stays. Only the goal changes. A longer goal can still chime later. A shorter goal you already passed will not ping you late.
Does the Ketosis badge mean I am in ketosis?
No. It means enough hours have passed on the educational timeline. It is not a ketone reading. Treat how you feel, and the stop rules, as more real than the label.
Can I keep going after the goal?
Yes. The goal is a bell, not a lock. Eat when your plan says eat. Use Open if you only want elapsed time and no target. Longer is not automatically better.
Is this medical advice?
No. It is a clock and reading we wrote. It cannot see your medicines or your labs. If you are pregnant, under 18, underweight, or managing diabetes or an eating disorder, do not treat Start as clearance.
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