Daily Water Intake Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter your body weight in kilograms.
- Press Calculate for a daily water guide.
How it works
A common guide is about 33 mL of water per kilogram of body weight per day. Your needs rise with heat, exercise and some health conditions.
Worked example
70 kg. ≈ 70 × 33 mL = 2.31 L a day, about 9 cups.
Frequently asked questions
Does coffee or tea count?
Most fluids contribute, but water is best. Very high caffeine has a mild diuretic effect.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.