Daily Water Intake Calculator
Calculate optimal daily hydration target in Liters, Ounces, and glasses based on weight & activity.
- 100% free
- Private in browser
- No signup
- No watermarks
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About Daily Water Intake Calculator
Stay hydrated with a personalized daily water intake target. Calculates your optimal fluid consumption in Liters, Ounces, and 250ml glasses considering body weight, exercise duration, weather, and pregnancy.
How to use Daily Water Intake Calculator
- Enter your body weight in kilograms or pounds.
- Enter your daily exercise duration (in minutes).
- Select your local climate (Normal, Hot / Humid, or Cold).
- View your recommended daily water volume and hourly hydration schedule.
Key features
- Scientific baseline formula: 35ml per kg of body weight
- Activity adjustments: adds ~350ml for every 30 minutes of exercise
- Climate adjustments for hot/humid environments
- Shows volume in Liters, Milliliters, Fluid Ounces, and standard 250ml glasses
- Suggested hourly hydration timeline
Frequently asked questions
- Why is staying hydrated important?
- Water regulates body temperature, keeps joints lubricated, prevents infections, delivers nutrients to cells, and keeps organs functioning properly.
- Do coffee and tea count towards water intake?
- Yes, moderate amounts of tea and coffee contribute to daily fluid intake, though plain water should remain the primary source.
- What do I need to enter?
- Just Body Weight, Daily Exercise and Weather / Climate. Every field has a sensible default you can start from.
- Is my data uploaded anywhere?
- No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
- Does it work on a phone?
- Yes. The layout adapts to small screens and needs no app or signup.
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