Fasting timer
16 hours
16:00:00
A timer only. It does not give medical or diet advice.
Track your fasting window
This fasting timer counts the hours of your fast and shows the time when your goal is reached. Choose a common schedule or set your own number of hours. You can start the fast now or set the time you last ate – for example, if you finished dinner at 8 pm and opened the page the next morning.
When you end the fast, the timer switches to your eating window and saves the fast to your history. You see your average length, your longest fast and how many days in a row you reached your goal.
Schedules
The first number is hours of fasting, the second is hours of the eating window in a 24-hour day.
12:12 and 14:10 – gentle schedules. 16:8 – the most common schedule. 18:6 and 20:4 – longer daily fasts. 23:1 – one meal a day. Custom – any length from 1 to 72 hours.
A tool, not advice
This page only measures time. It does not tell you what or when to eat. If you are pregnant, have diabetes, take medication or have a history of eating disorders, talk to a doctor before fasting.
Questions
Where is my fasting history saved?
Only in this browser. Nothing is uploaded and there is no account. Clearing your browser data deletes the history.
Can I start the fast in the past?
Yes. Set the time you started – for example when you finished your last meal – and the timer counts from there.
Do I get a notification when the fast ends?
If you allow notifications, you get one when you reach your goal while the page is open.
Does this timer give diet or medical advice?
No. It is only a timer. Ask a health professional about whether fasting is right for you.