Fasting Window
Live intermittent fasting countdown
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Fasting Window shows exactly where you are in your fast: a live countdown to when you can eat, a 24-hour strip of your eating window, and the stage your body is likely in, from fed to fat-burning. Pick a standard plan (12:12, 14:10, 16:8, 18:6, 20:4, OMAD, 5:2, alternate-day, 24h or 36h) or make your own: any eating window, a fast of any length on any days, your own low-calorie days, or a weekly schedule you write yourself. Get a healthy way to break each fast, take a break for holidays, and optionally enter your weight to see a safe daily and weekly fat-loss target. It needs no account, no API key and no server. General wellbeing information only, not medical advice.
Available settings
Fasting plan
Your fasting pattern. The first ten are standard plans: 16:8 means fast 16 hours, then eat within 8. The custom options at the end let you set your own times, fast length, low-calorie days, or a full weekly schedule.
Eating window opens at
When you have your first meal of the day. For a standard plan, the eating window closes automatically after the hours in the plan (for 16:8, 8 hours later).
Eating window closes at
When you finish your last meal of the day. Together with the time above, this sets your eating window.
Fast starts at
The time you stop eating to begin a long fast, usually after your evening meal.
Fast length (hours)
How long each fast lasts, in whole hours, from 12 to 168 (7 days).
Example: 24
Show all 24 options
Days a fast starts
The weekdays a fast starts on, at the time above. Pick one or more.
Fasting day
The weekday of your fast or low-calorie day.
Second fasting day
An optional second fasting or low-calorie day each week.
A low-calorie day
Any date that is, or was, one of your low-calorie days. Every second day from it is a low-calorie day.
Low-calorie days
The weekdays you eat little. Pick one or more. The other days are normal eating days.
Calorie limit on low-calorie days
How many calories you allow yourself on a low-calorie day.
Example: 500
Your weekly schedule
Set your eating windows for each day. Enter one rule per line.
Example: daily 12:00-20:00
sat 10:00-14:00 18:00-21:00
sun off
Take a break until
Pause your plan for holidays, travel or illness. The screen shows you are on a break and counts down to the day your plan starts again.
Title
The name shown in the title bar at the bottom of the screen.
Example: Fasting Window
Show tips
Yes shows a short tip for the moment (what to drink, how to break your fast, what to eat), a new one on every refresh.
Clock
How times are written on the screen.
Units
Units for your weight and height, and for the fat-loss numbers on the screen.
Your weight
Your current weight, in kg or lb to match Units. Needed for the fat-loss target.
Example: 75
Goal weight
The weight you are aiming for, in the same units. Used to estimate how many weeks it could take.
Example: 68
Pace
How quickly you want to lose fat.
Height
Your height, in cm or inches to match Units. With age and sex it is used to estimate your daily calories.
Example: 172
Age
Your age in years. Used in the calorie estimate.
Example: 35
Sex
Used only in the calorie formula and to set the minimum safe intake.
Activity level
How active you are on a typical week. More activity means more calories.
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