Water Intake Calculator
Calculate your daily hydration needs based on your weight, activity level, and climate.
This calculator auto-updates when values change.
Your Recommended Daily Target
Litres per day
3.0L
approximately 2,975 ml
Millilitres
2,975 ml
Standard cups
12.4 cups
The estimate starts with body weight, then adds allowances for activity and warmer environments. It includes hydrating fluids, though plain water is usually best.
About This Water Intake Calculator
This water intake calculator estimates a personalized daily hydration target using body weight, activity, and climate. It helps stop the guesswork around how much fluid you may need each day.
Your final target includes hydrating fluids, though plain water is usually the simplest choice. Needs can rise with exercise, hot climates, pregnancy, illness, or medication.
How to Use This Calculator
- 1
Enter your body weight
Choose kilograms or pounds and enter your current weight.
- 2
Choose activity level
More activity generally increases fluid needs.
- 3
Select climate
Warm or humid conditions increase sweat loss and raise hydration needs.
- 4
Review the target
Use the litre, millilitre, and cup estimates as a practical daily guide.
Frequently Asked Questions
How much water should I drink per day?v
A practical estimate depends on body weight, activity, and environment. This calculator gives a personalized daily target.
Do tea and coffee count?v
Most hydrating fluids can contribute to daily intake, although plain water is still a good baseline.
Do I need more water when exercising?v
Yes. Exercise increases sweat loss, so active people often need extra fluids.
Can I drink too much water?v
Yes. Very excessive water intake can be dangerous, especially if electrolytes become diluted.
Does climate matter?v
Yes. Hot and humid conditions usually increase fluid needs.
Is this medical advice?v
No. This calculator provides a general estimate only and is not medical advice.