Water Intake Calculator
Estimate your daily fluid intake based on your weight and activity.
Your Measurements
For generally healthy adults. This estimate is based on body weight and an illustrative exercise adjustment; actual needs depend on thirst, sweat loss, diet, and health.
This range is a rough starting point for beverages, not a required drinking target. Fluids from food also contribute to total water intake.
Important: This calculator is educational and is not a medical recommendation. There is no single fluid target suitable for everyone. Drinking excessive water can be harmful. If you have kidney, heart, or liver disease, have been told to limit fluids, are pregnant or breastfeeding, or are exercising heavily in heat, ask a qualified healthcare professional about your fluid needs. For long or strenuous exercise, electrolytes and measured sweat losses may matter.
