Free tool
Water intake calculator
How much water to drink a day, from your weight and activity.
Enter your weight to see a daily water target.
A general estimate based on roughly 33 ml per kilogram of body weight plus an activity allowance, and it counts all fluids and water-rich foods, not just plain water. On a GLP-1 this matters more than usual: appetite suppression dulls thirst cues, so many people drift into mild dehydration, which drives headaches, fatigue, and constipation. Drink to a target, not to thirst. More in the water guide. Heart or kidney conditions change the right amount, so confirm yours with a clinician.
This tool is general education, not medical advice, and its estimates do not account for your personal medical history. Decisions about your medication and treatment belong with a licensed clinician.
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