Water Intake Calculator | Daily Water Intake by Weight & Activity

Water Intake Calculator

How much water should you drink daily?

Hydration • Health • Wellness

Water Intake Calculator: Enter Your Details

Metric (kg, cm)

Imperial (lb, in)

Your Weight

Your Age

years

Gender

Male

Female

Activity Level

Climate

Please enter valid values.

Calculating…

Your Water Intake Calculator Results

2.5

liters per day

84.5

fluid oz

10.5

cups (8oz)

500ml bottles

ml per kg

104

ml per hour

Hydration Tips

Drink a glass of water first thing in the morning

Use a water tracking app or set hourly reminders

Eat water-rich foods: cucumber, watermelon, oranges

Drink before, during, and after exercise

About This Water Intake Calculator

Your personal hydration guide — simple, science‑backed, and tailored just for you.

What is this water intake calculator? This isn’t a one‑size‑fits‑all formula. It’s a smart tool that estimates your ideal daily water intake based on your unique body and lifestyle. Whether you’re lounging at home, hitting the gym, or working under the sun, you’ll know exactly how much water your body craves.

How does this water intake calculator work? We combine established medical guidelines with your personal inputs:

Weight & gender – Men generally need more water than women (35ml vs 31ml per kg).
Age – As we get older, our hydration needs shift slightly.
Activity level – Sweating = extra water. The more you move, the more you drink.
Climate – Hot, humid weather makes you lose fluids faster, so we bump up your target.

Start with the basics – Enter your weight, age, and gender. This sets your foundation for the water intake calculator.

Add your lifestyle – Pick your activity level and local climate. We adjust your needs accordingly.

Get your number – Instantly see your daily goal in liters, ounces, cups, or bottles. Plus, we show you how much that is per kilo and per hour — so you can pace yourself.

This water intake calculator follows recommendations from health institutes like the U.S. National Academies of Sciences, adapted to your real life. It’s not a medical tool — but it’s a great place to start feeling better, one glass at a time.

Frequently Asked Questions

How much water should I drink daily?

The general recommendation is 3.7 liters (125 oz) for men and 2.7 liters (91 oz) for women. However, your personal needs vary based on weight, activity, and climate. This water intake calculator provides a personalized estimate.

Does coffee and tea count toward water intake?

Yes! While caffeine has a mild diuretic effect, coffee and tea still contribute to your daily hydration. Water is best, but all fluids count.

How do I know if I’m drinking enough water?

Check your urine color – pale yellow means hydrated, dark yellow means drink more. Also watch for thirst, dry mouth, fatigue, and headaches.

Can I drink too much water?

Yes, though rare. Drinking excessive water quickly can lead to hyponatremia (low sodium). Stick to the recommended amount and listen to your body.

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