Fasting Window Planner
Plan your 16:8 or 18:6 intermittent fasting eating window around wake time, work and workouts.
About this tool
Fasting Window Planner
Plan your 16:8 or 18:6 intermittent fasting eating window around wake time, work and workouts.
Pick the plan, enter your wake time and see when to eat and when to fast. This page brings together 2 separate fasting window planner pages (18:6, 16:8) so you can compare them without hunting for the right one.
How to use Fasting Window Planner
- 1
Open Fasting Window Planner on AltFTool — it loads instantly in your browser.
- 2
Choose your plan at the top: 18:6, 16:8. On a phone it is a drop-down list.
- 3
Fill in the fasting window planner for that plan; each of the 2 options keeps its own rules, data and defaults.
- 4
Read the result, then switch plan to compare. The page link keeps your plan (?v=eighteen-six), so you can bookmark or share it.
Why use Fasting Window Planner
All 2 in one place
18:6, 16:8 and the rest sit behind one picker, so switching plan takes a tap instead of a new search.
Built for each option
Every plan keeps its own rules, numbers and defaults rather than one generic template.
Shareable view
The link remembers the plan you picked, so a bookmark or a shared link opens straight on it.
Common use cases
- Set a 13:00 to 19:00 window around an office day and see exactly how much water to drink before the first meal.
- Work backwards from a 19:00 family dinner to find when your window has to open the next day.
Frequently asked questions
Which plan options does this tool cover?
2: 18:6, 16:8. Pick one at the top of the tool; the page link updates (for example ?v=eighteen-six) so you can bookmark or share that exact view.
What is 18:6 intermittent fasting?
Eating all food within a 6-hour window and fasting for the other 18 hours of the day, usually as two meals. It is a step up from 16:8, and the shorter window is the reason most people who follow it eat twice rather than three times.
What does 16:8 intermittent fasting actually mean?
All food for the day goes inside an 8-hour window and the other 16 hours are a water-only fast. The two numbers always add up to 24, so a window from 12:00 to 20:00 means fasting from 20:00 until 12:00 the next day — and around 8 of those 16 hours are usually spent asleep.