Water Intake Calculator
Calculate how much water you should drink daily based on your weight, activity level, and climate. Get personalized hydration recommendations.
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Frequently Asked Questions
How much water should I drink per day?▾
A common guideline is to drink half your body weight in ounces. For example, a 160-pound person should aim for about 80 ounces (2.4 liters) per day, adjusted for exercise and climate.
Does exercise affect how much water I need?▾
Yes. You should drink an extra 12 ounces of water for every 30 minutes of exercise to replace fluids lost through sweat.
Does climate affect daily water intake?▾
Yes. Hot climates increase water needs by about 20% due to sweating, and cold climates increase needs by about 10% because dry air and indoor heating cause dehydration.
How many glasses of water is 64 ounces?▾
64 ounces equals 8 cups (8 oz each), which is the well-known "8x8 rule." However, individual needs vary based on weight, activity, and environment.
Is this water intake calculator free to use?▾
Yes. This calculator is completely free, runs entirely in your browser, and requires no signup. No data is sent to any server.