Water Intake Calculator
Estimate daily water intake using a simple guideline based on body weight and activity. Results are a general reference, not medical advice.
Informational estimate only. Needs vary by climate, diet, health conditions, and exercise. Calculations run locally in your browser (no inputs are stored or sent to a server).
Guideline used: ~35 ml per kg per day, plus a modest activity adjustment. Cups are approximate (1 cup ≈ 240 ml).
How it works
This tool uses a simple guideline based on body weight, then applies a modest adjustment for higher activity. The base estimate is approximately 35 ml per kg of body weight per day.
- Base estimate: weight (kg) × 35 ml
- Activity adjustment: adds a small amount for moderate or high activity
- Cups: shown as an approximation using 1 cup ≈ 240 ml
This is not medical advice. If you have kidney or heart conditions, are pregnant, or have specific medical needs, consult a clinician.
Examples
- 70 kg, low activity → about 2.45 L (≈ 10 cups)
- 70 kg, moderate activity → modestly higher estimate
- 150 lb, low activity → roughly 2.4 L (approx.)
When to use this tool
This tool is designed for quick, practical tasks such as everyday calculations, data formatting, or simple conversions. It is best used when you need fast results without installing software or using complex tools.
When to use
- Quick checks or one-time calculations
- Validating or converting data before using it elsewhere
- Simple tasks that do not require advanced software
When not to use
- Critical financial, legal, or medical decisions
- Large-scale or automated processing
- Situations requiring guaranteed precision beyond basic validation
Always review results before using them in important contexts.
About this tool
This tool helps you perform quick utility operations directly in your browser. It runs entirely in your browser without sending data to a server.
You can use this tool when handling simple tasks without installing additional software. The results should be interpreted as a processed output based on your input data.
FAQ
- How much water should I drink per day?
Many people use weight-based guidelines, but needs vary widely by climate, activity, diet, and health.
- Is this a medical recommendation?
No. This is an informational estimate based on a rule-of-thumb and does not replace medical advice.
- Does coffee or tea count as water?
Fluids contribute to hydration, but tolerance to caffeine varies. This tool does not model caffeine effects.
- Why show cups?
Cups help quick planning. This page uses 1 cup ≈ 240 ml as an approximation.
- Is my data stored?
No. Calculations run locally in your browser. Inputs are not stored or sent to a server.