Water-intake calculator
Estimate a practical daily fluid target based on body weight, exercise minutes and climate, with metric and US results.
Estimate daily water
This practical estimate starts with body weight and adds an allowance for exercise and heat. It is not a medical fluid prescription.
Your estimate
| Estimated fluids | — |
| US fluid ounces | — |
| Approximate cups | — |
| Exercise/climate addition | — |
Change any input to update the estimate.
What counts as fluid?
Water, milk, tea, coffee and water-rich foods contribute to total water intake. The calculator displays a practical fluid target, but food and beverage choices also affect electrolytes and calories.
When needs rise
Hot weather, fever, diarrhea, vomiting, high altitude, long exercise and heavy sweating can increase requirements. Sports lasting many hours may also require sodium and individualized planning, not water alone.
When to follow medical advice instead
Kidney disease, heart failure, liver disease, fluid restrictions, pregnancy complications and medications affecting fluid balance require professional advice.
Frequently asked questions
How much water should I drink per day?
Needs vary with body size, food, weather, sweating, pregnancy, illness and medication. A calculator can only provide a starting estimate.
Does food count toward water intake?
Yes. Total water includes drinking water, other beverages and water contained in food.
Can drinking too much water be harmful?
Yes. Excessive intake can be dangerous. Do not force large amounts, especially with kidney, heart or electrolyte conditions.
Should urine always be completely clear?
Not necessarily. Constantly colorless urine can accompany excessive intake; hydration assessment is more nuanced than one color check.
Method and sources
EKCal provides planning estimates, not diagnosis or treatment. Results should be checked against real-world trends and adjusted gradually.