Water Intake
Water Intake — runs in your browser. Inputs are not stored.
Daily water intake guide
Enter values, then press Calculate.
A typical weight-based estimate. Needs can differ with illness, pregnancy, or exercise, so use it as a reference only.
How to use
- Enter Weight (kg). The default example is 70.
- If needed, change the ml per kg of body weight factor. The default is 33; 30–35 is a common range.
- Press Calculate to see the recommended amount in both ml and liters (L).
- In heat, with more exercise, or with more caffeine, you can raise the factor a little and compare. If you have illness or edema, follow a doctor’s instructions first.
- Reset restores 70 kg and 33 ml/kg.
Key concepts
The water intake calculator is a simple guide when you look up a daily water target in ml per kg. Recommended amount = weight (kg) × factor (ml/kg), and the screen shows both ml and L. It is closer to searches that want a weight-based figure than a fixed eight-glass rule. It is a simple water-intake guide that estimates daily liters as weight × ml/kg. It is searched when people want to match intake to body weight rather than a fixed eight glasses. It is a simple guide that multiplies weight by a factor to show daily recommended ml and L. If you have a medical condition, a doctor’s instructions come first.
Need varies with climate, exercise, pregnancy, and kidney or heart disease. Whether coffee and tea count as water is debated; for a pure-water target, count water mainly. This is not medical advice. The calculation is not sent anywhere. Sweat, dry indoor air, or a salty meal can raise need; kidney or heart disease and edema may require limits. A doctor’s instructions come first. On hot or workout days, raise the factor to compare, and treat coffee as water or not depending on your goal.
Example
70 kg × 33 is 2,310 ml, about 2.31 L. Lowering the factor to 30 gives 2,100 ml; raising it to 35 gives 2,450 ml. 50 kg × 33 is 1,650 ml. Pregnant people may have a separate recommendation, so do not follow this number alone. 80 kg × 33 = 2,640 ml (2.64 L). Raising the factor to 35 only on workout days lets you compare 2,800 ml. 55 kg × 33 = 1,815 ml. Lowering the factor to 30 gives 1,650 ml.
Notes
This result is not a medical diagnosis or treatment advice. Consult a health professional for decisions about health, pregnancy, or nutrition.
Related: Body fat calculator · Calorie calculator (BMR·TDEE) · Protein intake calculator
Frequently asked questions
Why is the water intake calculator’s default factor 33?
33 is the default in the roughly 30–35 ml/kg range. Change it if you need to. 30–35 is a conventional approximation, not a personal prescription. 33 is only the default in that range.
Do coffee and tea count toward daily water intake?
For a target close to pure water, calculate water mainly. Use a separate caffeine calculator for caffeinated drinks. Whether coffee counts as water is debated, so keep it distinct from a pure-water goal.
Does this formula apply to pregnancy water recommendations?
There may be a separate recommendation; follow a doctor’s instructions. This tool is simple weight multiplication. Follow obstetric guidance for fluid goals in pregnancy.
Is water intake input sent to a server?
No. It only multiplies in the browser. The weight number is not sent.
Is the result shown in liters too?
Yes. ml and L are shown together. The L field is ml divided by 1000.
How much should I raise the factor on workout days?
It depends on sweat. This screen uses one factor, so change the factor and recalculate to compare workout days. It does not add exercise automatically; raise the factor yourself to compare.
Last reviewed: 2026-09-04