Water Intake Calculator
Your entries are calculated in this browser and are not saved by this tool.
This result is an estimate and does not diagnose, prevent or treat any condition. Consult a qualified health professional.
How the Water Intake Calculator works
Estimate daily water intake with a simple weight and exercise heuristic. Enter the requested values in the tool above, select Calculate, and review both the main result and its breakdown.
Formula used
Base estimate = 35 mL × body weight in kg, plus 350 mL per 30 exercise minutes and the selected climate adjustment.
Worked example
Needs vary with health, pregnancy, food, medication and climate; too much water can also be harmful.
Practical uses
- Set a general hydration reminder
- Adjust for exercise
- Discuss special needs with a clinician
Assumptions and limits
Health results are screening estimates, not a diagnosis. Individual needs and clinical circumstances can differ. For reproducibility, record the inputs and assumptions used when sharing a result.
Frequently asked questions
Is this calculator free?
Yes. It can be used without creating an account.
Are the values I enter stored?
The calculation runs in your browser. The core tool does not submit your calculator entries to WordPress.
Can I rely on the result for a major decision?
Use it as an educational estimate, verify important inputs, and seek qualified advice when the decision carries financial, medical, tax or legal consequences.