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What is Water Intake Calculator?

Free water intake calculator. Get your recommended daily water intake in oz and L based on weight, climate, exercise habits, and pregnancy/breastfeeding status — with an hourly drinking schedule. No signup.

No file uploadsNo tracking of inputsNo account requiredWorks offline after first load

Water Calculator runs entirely in your browser using JavaScript (browser). Your data never leaves your device.

Free Water Intake Calculator

Find out how much water you should drink per day — personalized for your body weight, climate, daily exercise, and whether you are pregnant or breastfeeding. Get your total in both ounces and liters, plus a suggested hourly breakdown for waking hours so you know how to pace your intake throughout the day.

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Daily water target

107 oz

3.2 liters

Per hour (waking)

6.7 oz

197 mL

Glasses (8 oz)

13

glasses / day

Hourly drinking schedule+

7 AM

6.7 oz

197 mL

8 AM

6.7 oz

197 mL

9 AM

6.7 oz

197 mL

10 AM

6.7 oz

197 mL

11 AM

6.7 oz

197 mL

12 PM

6.7 oz

197 mL

1 PM

6.7 oz

197 mL

2 PM

6.7 oz

197 mL

3 PM

6.7 oz

197 mL

4 PM

6.7 oz

197 mL

5 PM

6.7 oz

197 mL

6 PM

6.7 oz

197 mL

7 PM

6.7 oz

197 mL

8 PM

6.7 oz

197 mL

9 PM

6.7 oz

197 mL

10 PM

6.7 oz

197 mL

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All calculations run in your browser. No data is sent to any server.

Frequently Asked Questions

The National Academies of Sciences recommends about 3.7 liters (125 oz) total water per day for men and 2.7 liters (91 oz) for women — from all beverages and food combined. About 20% of daily water intake comes from food. Needs vary significantly by body size, activity level, climate, and health status. This calculator provides a personalized estimate based on your inputs.
Yes. Sweat losses during moderate exercise range from 0.5 to 2 liters per hour depending on intensity, temperature, and individual sweat rate. A general rule is to add approximately 12 oz (350 mL) of water for every 30 minutes of exercise, or to weigh yourself before and after training — each pound lost represents about 16 oz of fluid that needs to be replaced.
Significantly. Hot and humid climates increase sweat rate and respiratory water losses. At high altitude, respiratory rate increases, boosting water loss through breathing. Cold environments also impair thirst sensation, meaning you can dehydrate in cold weather without feeling thirsty. This calculator adjusts your recommendation based on climate.
Water can support weight loss indirectly: drinking water before meals reduces calorie intake in some studies, replacing caloric beverages with water reduces total calories, and dehydration can impair metabolic function and exercise performance. However, water itself has no direct fat-burning effect. It is a supportive strategy, not a standalone solution.
At typical consumption levels, no. Research shows that caffeinated beverages like coffee and tea contribute to daily hydration despite mild diuretic effects. The water content of the beverage more than compensates for increased urine output. However, very high caffeine intake (600+ mg/day) can increase water needs slightly.

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Why Hydration Matters

Water makes up approximately 60% of body weight in adults. It is essential for temperature regulation, nutrient transport, joint lubrication, and cognitive function. Even mild dehydration (1–2% of body weight) impairs physical performance, reduces concentration, and increases perceived effort during exercise.

Signs of Dehydration

The most reliable field indicator is urine color: pale yellow to straw-colored indicates adequate hydration; dark yellow or amber suggests dehydration. Thirst is a late indicator — by the time you feel thirsty, you are already mildly dehydrated. Dry mouth, fatigue, headache, and reduced urine output are other common signs.

Hydration During Exercise

Sweat rates vary widely (0.5–2+ L/hour). The American College of Sports Medicine recommends drinking 500 mL (17 oz) of water 2 hours before exercise, sipping 150–250 mL (5–8 oz) every 15–20 minutes during exercise, and rehydrating with 1.5× the fluid lost (measured by body weight change) after exercise. For sessions over 60–90 minutes, electrolyte replacement becomes important alongside water.

Hydration, Wellness, and Sobriety

Hydration is a core pillar of any wellness routine — alongside sleep, nutrition, and movement. If you are tracking your health holistically, RowGress sobriety tracking and the Fitness Age tool pair well with a hydration practice. For nutrition alongside your hydration goals, see RowGress meals and all free fitness calculators.