Hydration needs are not one fixed number
Climate, activity, food water, kidney and heart function, medication, illness, pregnancy, and sweat loss all change fluid needs. Both dehydration and excessive water intake can be dangerous.
Electrolytes need context
Sodium, potassium, and magnesium supplements can interact with medication and medical conditions. Generic dosing is inappropriate for prolonged fasting; use clinician-directed advice.
Stop signals
End the fast and seek medical care for fainting, confusion, chest pain, persistent vomiting, severe weakness, palpitations, or concerning glucose readings.
Questions, answered plainly
Why does the calculator not give an electrolyte recipe?+
Safe dosing depends on health status, medication, kidney function, losses, and duration. A generic web tool cannot assess those factors.
Is water fasting suitable for weight loss?+
Rapid scale changes include water and glycogen. Prolonged fasting has risks and is not necessary for steady fat loss.
Do I need an account to use the calculator?+
No. The web calculators are free and run in your browser without an account.
Sources and further reading
Sources behind the formulas and explanations.