💧 Water Intake Calculator
Get a general estimate of your daily water intake based on your body weight, using a commonly cited hydration guideline.
General guideline: ~33ml per kg of body weight.
How the Water Intake Calculator works
The estimate uses approximately 33ml of water per kilogram of body weight — a general public-health guideline, not a personalized medical recommendation.
Step-by-step calculation
- 1Enter body weight.
- 2Multiply kg by about 33 mL.
Worked example
70 kg × 33 mL = about 2.3 liters (roughly 9–10 cups) a day, including water from food and drinks.
Water Intake Calculator examples
| Weight (kg) | Suggested daily intake |
|---|---|
| 35 | 1.2 L (~5 cups) |
| 53 | 1.7 L (~7 cups) |
| 70 | 2.3 L (~10 cups) |
| 88 | 2.9 L (~12 cups) |
| 105 | 3.5 L (~15 cups) |
Other inputs kept at the calculator's default values. Results calculated by this calculator.
Why use a Water Intake Calculator?
Get a simple daily water target.
Important factors that can affect your results
- Heat and exercise.
- Food provides water too.
- Medical conditions that limit fluids.
Frequently asked questions
Does climate or activity level change this?
Yes — hotter climates and higher activity levels increase fluid needs beyond this general baseline estimate.
Is this medical advice?
No — it's a general wellness estimate. Talk to a healthcare provider if you have specific hydration or kidney-related concerns.
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Last reviewed November 2026 · How we build and check our tools · Report a problem