Daily Water Intake Calculator
See the official daily water ranges for adult men and women — total water and how much of it usually comes from drinks.
Total water a day (food + drinks)
2.5–3.7 L
- From drinks (about 81%)
- 2.0–3.0 L
- Drinks in US cups
- 9–13 cups
- Drinks in fluid ounces
- 69–101 fl oz
These are population averages for healthy adults in temperate climates. Heat, exercise and illness raise needs; pregnancy, breastfeeding, kidney or heart conditions need a clinician's advice. Thirst is a good everyday guide.
For general information only — not medical advice. Talk to a doctor or other qualified professional about your health.
How it works
Adequate Intake of total water (food + drinks), adults: EFSA 2010 — 2.5 L men, 2.0 L women; US National Academies 2004 — 3.7 L men, 2.7 L women, about 81% of it from drinks (3.0 L and 2.2 L)
Questions
- How does the daily water intake calculator work?
- Adequate Intake of total water (food + drinks), adults: EFSA 2010 — 2.5 L men, 2.0 L women; US National Academies 2004 — 3.7 L men, 2.7 L women, about 81% of it from drinks (3.0 L and 2.2 L).
- What do I need to enter?
- Sex. Optional fields can be left blank.
Related tools
- Lean Body Mass CalculatorEstimate lean body mass (everything except fat) from height, weight and sex with the Boer and Hume formulas.
- Waist-to-Height Ratio CalculatorDivide your waist by your height and see where it falls in NICE's waist-to-height bands, plus the waist that is half your height.
- Tire Size CalculatorCompare two tire sizes — diameter, sidewall, circumference, revolutions per mile — and see how far off your speedometer will read.
- Light Bulb Watts to LumensFind the lumens an LED needs to replace an old 40–150 W bulb, or the old-bulb equivalent of an LED's lumens, with the energy saved.
- Ring Size ConverterConvert ring sizes between US/Canada, UK/Australia letters, inner diameter and inner circumference (ISO 8653).
- Hat Size ConverterTurn a head measurement into US fitted hat size (in eighths) and metric hat size.
Want this on your site? Embed the daily water intake calculator.