Water Intake Calculator — Daily Hydration Needs
Calculate how much water you should drink daily based on your body weight, activity level, and climate. Get personalized hydration targets backed by the National Academies of Medicine guidelines.
Frequently Asked Questions
How much water should I drink per day?
A good baseline is half your body weight in ounces. For a 160-lb person, that's about 80 oz (2.4 liters). Active individuals and those in hot climates need more — typically 12–16 oz extra per hour of exercise. This calculator adjusts for your specific weight, activity, and climate.
Does coffee count toward water intake?
Yes, coffee and tea count toward your daily fluid intake. While caffeine has a mild diuretic effect, the net hydration from coffee is still positive. However, water and herbal tea are the best hydration sources because they have zero calories.
How do I know if I'm dehydrated?
Common signs of dehydration include dark yellow urine, thirst, headache, fatigue, and dizziness. A simple test: if your urine is pale yellow or clear, you're well hydrated. Dark amber urine means you need more fluids.
Put your numbers into action
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