Food
Water Intake Calculator
- Browser-based
- No signup
Enter your weight, activity level, and climate to estimate daily water intake. Results are shown in liters, milliliters, cups, glasses, and fluid ounces. This is a general educational estimate, not medical advice.
100% Client-Side
Your data never leaves your computer.
How to use this tool
1. Enter body weight and activity level (and climate if asked). 2. Click Calculate. 3. Review recommended daily water intake in liters or cups. 4. Adjust for medical guidance from your clinician. 5. Use as a planning estimate, not a hydration prescription.
Worked example
Example: 70 kg with moderate activity often suggests roughly 2–2.5 L per day before climate adjustments.
How it works
Daily water intake is estimated from body weight using about 33 ml per kilogram, then adjusted for activity level and climate. Results are shown in liters, milliliters, cups, glasses, and fluid ounces. This is a general estimate, not a medical recommendation.
Limitations
This tool provides a general estimate for educational purposes and is not medical advice. Consult a qualified healthcare professional for personal guidance.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Accuracy & methodology
This section documents how the calculator works, what it leaves out, and when results were last reviewed. Figures are educational estimates—not professional advice—and are not labeled "current" unless tied to automatically updated reference data.
- Formula source or methodology
- Daily intake estimate from body weight and activity level using common heuristic formulas (weight-based baseline plus activity adjustment).
- Jurisdiction
- General wellness estimate
- Unit system
- Metric or US weight; output in liters or US cups/fl oz per form
- Rounding method
- Volumes round to practical whole or one-decimal units in the UI
- Assumptions
- Healthy adult context
- Activity level adjusts a weight-derived baseline
- Known omissions
- Not medical advice. Does not diagnose, treat, or replace clinical assessment.
- Climate, altitude, illness, pregnancy, and breastfeeding needs
- Medical fluid restrictions (heart failure, renal disease)
- Caffeine or alcohol diuretic adjustments
- Test cases (automated)
- Valid weight and activity return a positive daily intake
- Zero weight is rejected
- Version & last verified
Logic version 1.0. Content and formulas last verified .
Frequently asked questions
How is daily water intake estimated?
The estimate starts from about 33 ml of water per kilogram of body weight, then adjusts for activity level and climate.
Does this include water from food?
No. The result is a simple drinking-water estimate. Total fluid needs also come from food and other beverages.
Is this medical advice?
No. This calculator is educational only. Personal hydration needs vary, so talk with a healthcare professional for guidance.
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