Sick Day Fluid Intake Calculator
Calculate how much fluid you need when sick based on your weight and fever status.
Stay properly hydrated during illness.
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Recommended Fluid Intake
Sick day fluid needs are higher than normal because fever, sweating, vomiting, and diarrhea increase fluid loss.
Baseline fluid need:
30-35 mL per kg of body weight per day
Fever adjustment: For every degree above 37C (98.6F), add approximately 500 mL (about 2 cups) per day.
General guidelines when sick:
- Mild illness (no fever): baseline + 500 mL extra
- Moderate fever (38-39C / 100.4-102.2F): baseline + 1,000 mL extra
- High fever (above 39C / 102.2F): baseline + 1,500 mL extra
- With vomiting/diarrhea: add 250 mL per episode
Sip fluids frequently rather than drinking large amounts at once. Water, broth, herbal tea, and electrolyte drinks are good choices.