Water Intake
A daily target adjusted for exercise and climate.
About Water Intake
Water Intake estimates a daily target from your body weight, adjusted for exercise and climate — both of which matter far more than the "eight glasses" rule, which has no real evidential basis. In a Jordanian summer the difference is close to a litre a day.
How to use it
- Enter your weight.
- Add today’s exercise minutes and pick your climate.
- Read the target, and the suggested amount per two waking hours.
Questions
Where does "eight glasses a day" come from?
A 1945 recommendation that also noted most of it comes from food — a qualification that got dropped. There is no strong evidence for the specific number.
Does tea and coffee count?
Yes. The diuretic effect of normal caffeine intake is far smaller than the fluid consumed, so they contribute positively.
How do I know if I am drinking enough?
Pale straw-coloured urine and not feeling thirsty. Those beat any formula. Dark urine means drink more.
Can you drink too much?
Yes — hyponatremia is rare but dangerous, usually from drinking litres quickly during endurance events. Spread intake through the day.
Water Intake is free and runs entirely in your browser. No account, no upload, no watermark, no limit on use.