Extended Fast Planner
Choose a length, then drag the fasting window to see start, finish, and duration.
Pick a fasting length and a starting point. The highlighted window is the calculator — drag either edge or move the whole interval to see when you finish.
Example values
86 kg · Metric
Results use a typical adult male until you enter your data.
Fast length
Starting point
Choose fasting length
Educational estimate only. Extended fasting is not for everyone — talk to a healthcare professional first, especially if you are pregnant, underweight, take medication, or have a health condition.