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Water Intake Calculator

Compare water from drinks and food with a general reference for adults. Convert your entries between liters and US cups, without treating the result as personal medical advice.

The National Academies reference is 2.7 L/day for women and 3.7 L/day for men ages 19–30. It counts water in food, beverages and drinking water. These are population Adequate Intake values, not personal prescriptions or minimums for every person. Read the National Academies reference. CDC: water needs vary.

In one U.S. dietary survey, food supplied about 19% of total water intake. This is historical population data, not an estimate of your meals; enter food water only if you have a reasonable estimate.

A comparison only—not a hydration test, diagnosis, safety limit or personal recommendation. Needs vary with age, pregnancy or breastfeeding, activity, climate, health and medicines. Ask a clinician about personal needs, especially if you have a fluid restriction or kidney or heart condition. Do not force fluids to reach a number.

How much water is in my daily drinks and food?

Enter the volume of beverages you consumed and, if known, an estimate of water from food. The calculator adds those entries and compares them with a population reference; it does not diagnose hydration or prescribe a personal amount.

Frequently asked questions

How much water is in my daily drinks and food?

Enter the volume of beverages you consumed and, if known, an estimate of water from food. The calculator adds those entries and compares them with a population reference; it does not diagnose hydration or prescribe a personal amount.

Are my intake amounts saved or uploaded?

No. The calculation runs in this browser tab. Your entries are not uploaded or saved by this tool.

Does the reference mean I should drink that many liters of water?

No. The values are Adequate Intake references for total water from food and all beverages for a population group. They are not a personal prescription or a requirement to drink that amount as plain water.

Why does the calculator include water from food?

The source reference counts water from food, beverages and drinking water. Food contribution varies, so the calculator leaves it optional and does not guess it for you.

Can this tell whether I am dehydrated?

No. It only adds amounts you enter and compares the sum with a general reference. It does not assess symptoms or hydration status. Individual needs vary; contact a healthcare professional for personal advice.