What does an eating-window schedule show?
Time-restricted eating defines hours for eating and hours without caloric intake. A label such as 16:8 describes 16 fasting hours and an eight-hour eating window within a 24-hour cycle.
Simple clock arithmetic
The selected 12–20 hour duration is added to your last-meal time. The complementary eating window is 24 hours minus the fasting duration. Times that cross midnight are labeled for the following day; the tool uses a repeating 24-hour schedule.
How to use this calculator
- 1Enter the time you finish your last meal using your local clock.
- 2Select the fasting duration you want to visualize.
- 3Calculate the end time and eating window, including the next-day indication.
Understanding your result
For a last meal at 20:00 and a 16-hour window, the next eating time is 12:00 the following day. That timing calculation says nothing about nutritional adequacy, weight change, or the safety of skipping meals.
Assumptions & limitations
- This is not suitable as self-directed fasting advice for children, pregnancy, breastfeeding, or eating-disorder history.
- Diabetes, medications that require food, and other conditions may make fasting unsafe without clinical guidance; time-zone and daylight-saving changes are not modeled.
Frequently asked questions
Does 16:8 mean I need to fast for 16 hours?+
No. It names one timing pattern. The calculator lets you visualize it but does not recommend that pattern for you.
Does a longer fasting window guarantee more weight loss?+
No. Eating-window length alone does not establish overall intake, food quality, adherence, or weight change.
What if the end time crosses midnight?+
The tool carries the clock time into the following day and labels that transition. It does not assume the end time is earlier on the same day.
Can I use this to change medication timing?+
No. Follow prescribing instructions. Speak with a clinician or pharmacist before changing meal timing when medicines, glucose management, or other health needs are involved.
