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Water Intake Calculator

Daily water needs from EFSA reference values, including pregnancy and breastfeeding.

For everyoneNutritionv2.0.0

Your measurements

years
Sex

Calculated on your device. Nothing is sent to a server.

Your result will appear here

Enter your measurements, then press Calculate.

Methodology

EFSA adequate intakes for total water (2010)

Adults: men 2.5 L, women 2.0 L; pregnancy +0.3 L; breastfeeding +0.7 L; children by age band

EFSA set adequate intakes for total water from drinks and food. About 20–30% normally comes from food, so roughly 80% is assumed to come from drinks.

Who it is for
Healthy people aged 2 and over in a temperate climate with moderate activity.
Version
2.0.0

Worked example: how to calculate daily water

Inputs

Age
35 years
Sex
Male

Result

Total water from all sources
2.5 L/day
Approximately from drinks (about 80%)
2 L/day
Approximate 250 mL cups of drinks
8

An illustration with sample values, worked out with the same method the tool above uses.

Limitations

  • Hot weather, sweating, exercise, fever and diarrhoea all increase needs.
  • People with heart failure or kidney disease may be told to limit fluids — follow that advice.

References

  1. EFSA Panel on Dietetic Products, Nutrition, and Allergies. Scientific Opinion on Dietary Reference Values for water. EFSA Journal. 2010;8(3):1459. doi:10.2903/j.efsa.2010.1459
  2. Sawka MN, Cheuvront SN, Carter R 3rd. Human water needs. Nutr Rev. 2005;63(6 Pt 2):S30–S39. doi:10.1111/j.1753-4887.2005.tb00152.x

Continue with your measurements

Shared measurements carry over automatically, in this tab only.