Intermittent Fasting Window Planner

How to use

1. Fill the fields above — results update as you type.
2. Adjust any input to compare scenarios instantly.
3. Nothing is uploaded; everything runs in your browser.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance) as of 2026-08. For decisions that matter, confirm with a licensed professional in your country.

About this tool

16:8 and friends are just clock math from your last bite — the planner shows first-meal and kitchen-closes times so the window survives real life.

FAQ

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