Skip to content

Timer data stays on this device. Google Analytics can send cookieless signals before your choice or after decline. Your choice controls analytics storage; change it on Privacy. Privacy Policy

18:6 intermittent fasting

An 18-hour interval without eating and six hours for meals. It removes two eating hours compared with 16:8, without proving a better result.

18h

Fast

6h

Eating window

Start 18:6 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 1:00 PM

    First planned meal time.

  2. Eating window closes at 7:00 PM

    Last planned meal time.

  3. Fast until 1:00 PM the next day

    18-hour fasting window begins.

Planning considerations

  • Lunch at 13:00 and dinner finished by 19:00.
  • Use this page to compare timing constraints; suitability requires your own circumstances and, when needed, professional advice.

Practical tradeoffs

Practical use

  • Offers a simple six-hour boundary for comparing meal times.

Constraints

  • Fitting adequate food and social meals into six hours can be difficult.
  • 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. It is background context, not a trial of this exact schedule.

    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 18:6 better than 16:8?
This page does not establish that. The schedules differ by two hours; benefits, tolerability and nutritional adequacy cannot be inferred from that difference alone.
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.

← All protocols