Intermittent Fasting Calculator
Plan fasting versus eating hours in a 24-hour model.
Use the calculator below, then review the formula, a numeric example, and the reference table to understand how the intermittent fasting window result is produced.
Educational tool only. It does not replace advice from a licensed clinician, dietitian, or exercise physiologist.
Calculator inputs
Result
–
What is this calculator?
Plan fasting versus eating hours in a 24-hour model. The formula, a worked example, and a reference table are below. Results are for education only, not medical advice.
How it works
In a 24 h model: fasting hours = 24 − eating window hours.
Example
8 h eating window 16 h fasting in the simple model.
Reference Table
| Value | Meaning |
|---|---|
| 16:8 | Fast 16, eat 8 |
| 12:12 | Gentler entry |
| OMAD | One meal–advanced, not for everyone |
FAQ
Medications with food?
Some require meals; fasting may be unsafe.
Disordered eating history?
Avoid rigid fasting without specialist support.
Athletes?
Training fueling windows need customization.
Better fat loss?
Adherence drives results; total calories still matter.