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16:8 intermittent fasting

A 16-hour interval without eating with eight hours for meals. The window can be early or late; skipping breakfast is not required by the notation.

16h

Fast

8h

Eating window

Start 16:8 timer

No app, no signup. The timer opens in your browser and keeps history on this device.

  • No app
  • No account
  • Not medical advice

By FastWindowTimer · Published: 2026-06-21 · Content updated: · Not individually medically reviewed — see editorial policy

Example schedule

  1. Eating window opens at 12:00 PM

    First planned meal time.

  2. Eating window closes at 8:00 PM

    Last planned meal time.

  3. Fast until 12:00 PM the next day

    16-hour fasting window begins.

Planning considerations

  • Compare 08:00–16:00 with 12:00–20:00 before choosing.
  • Use this page to compare timing constraints; suitability requires your own circumstances and, when needed, professional advice.

Practical tradeoffs

Practical use

  • Has room for more than one meal and can be moved to match a workday.

Constraints

  • An early window may conflict with dinner; a late window may conflict with breakfast or medication.
  • Do not alter prescribed medication or ignore symptoms to complete a window.

Sources

  1. Cleveland Clinic — What Is Intermittent Fasting? (opens in a new tab)

    What this source supports: Describes daily time-restricted eating and the weekly 5:2 pattern. The example clock times on this page are arithmetic illustrations. The source describes 16:8 and 14:10 directly.

    What it cannot establish: Does not demonstrate that a longer fasting window is better or establish individual suitability.

    Source checked:

  2. Cleveland Clinic — 6 Tips for Fasting Safely (opens in a new tab)

    What this source supports: Discusses planning, hydration, medication and avoiding extreme fasting.

    What it cannot establish: General clinical education, not approval of this exact schedule for the reader.

    Source checked:

Frequently asked questions

Is 16:8 the same as skipping breakfast?
No. Eating from 08:00 to 16:00 also makes an eight-hour window. The calculator plans clock times and does not choose the healthiest timing for you.
What does this schedule tell me about my body?
Only the intended eating and fasting times. It does not measure insulin, ketones, autophagy, or the nutritional adequacy of your meals.
What if the schedule does not fit my day?
Choose a wider eating window or regular meal times. You do not need to compensate for a missed target by extending the next fast.

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