Water Intake Calculator
Free water intake calculator — updated for 2025. Accurate, instant, no sign-up needed.
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Daily Water Intake Calculator
How much water should you drink per day?
Daily Water (Liters)
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In 8 oz Cups
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In Fluid Ounces
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How Much Water Do You Need?
The "8 glasses a day" is a rough guideline. Actual needs depend on weight, activity level, climate, and overall health. About 20% of daily water comes from food.
💡 Check your urine: pale yellow = well hydrated. Dark yellow = drink more water.