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Water Intake Information

How much water should I drink?

Choose a reference group to see the published total water figure in liters, cups and ounces.

One Click Answers · Water Intake Information
oneclickanswers.com/water-intake-calculator · Printed
About this tool & how to use it

What it does

Shows the published reference for total daily water (drinks and food) for young adults in liters, cups and ounces. Information only, not a personal target.

How to use it

  1. Choose the reference group.
  2. Read the figure in liters, cups and fluid ounces.
  3. Note the share that comes from drinks in the survey data behind it.

One click answer

Your answer will appear here.

Fill in the form and your answer appears here as you type.

Assumptions

  • Only the groups whose figures were read are offered. The reference covers ages 19 to 30.
  • The CDC states that needs vary with age, sex, pregnancy, activity and breastfeeding, so this is not a personal target.
  • It is not advice about how much to drink.

Printed from oneclickanswers.com. Results are estimates based on what was entered; see the assumptions above.

How it works

The Institute of Medicine (2005) sets an Adequate Intake for total water of 3.7 liters a day for men and 2.7 liters for women aged 19 to 30. Total water includes drinks and food.

About 81% came from beverages and 19% from food in the survey data behind it, so 2.7 liters is about 2.2 liters from drinks.

The liters are converted to US fluid ounces (1 liter is 33.814 fl oz) and cups (8 fl oz).

Formulas and details
  • US fluid ounces = liters x 33.814.
  • Beverage share = total x 0.81.

Assumptions

  • Only the groups whose figures were read are offered. The reference covers ages 19 to 30.
  • The CDC states that needs vary with age, sex, pregnancy, activity and breastfeeding, so this is not a personal target.
  • It is not advice about how much to drink.

Example

Input: The starting values already in the form

Result: The Institute of Medicine's reference for total water for a woman aged 19 to 30 is 2.7 liters a day, from drinks and food together. That is about 91 US fluid ounces (11.4 cups). Roughly 81% of intake comes from beverages in the survey data behind it, about 2.2 liters (74 fluid ounces).

Questions

Do I need eight glasses a day?

The page does not use that rule. It shows the published figure and says it covers all water, food included, for one age group.

Why is there no figure for my age?

Only figures from a page that was read are shown. Other groups are not made up.

Last reviewed 2026-10-04.

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