Water Intake Calculator
Calculate how much water you should drink per day based on weight and activity level.
How to Use the Water Intake Calculator
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Choose your unit system
Toggle between Metric (kg, cm) and Imperial (lbs, ft, in) using the switch at the top.
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Enter your measurements
Fill in the required fields such as age, height, weight, or activity level.
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Click "Calculate"
Your result appears instantly with a clear explanation of what it means.
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Read the full breakdown
Scroll to see detailed information, charts, and ranges to understand your result.
Frequently Asked Questions
These calculators use standard published formulas (e.g., Mifflin-St Jeor for BMR). They are for educational and informational purposes only. Always consult a qualified healthcare professional for medical or fitness advice.
No. All calculations run locally in your browser. We never see or store your height, weight, age, or any other data you enter.
Use whichever you are comfortable with — Metric (kg, cm) or Imperial (lbs, ft). The toggle at the top of the tool switches between them instantly.
Health metrics like BMI and TDEE change with your body composition. Recalculate whenever your weight, activity level, or fitness goals change significantly.
100% free — no registration required.