Daily water calculator
How Much Water Should I Drink Today?
Get a practical fluid target for your body and your plans today.
Plain answers
Water questions people actually ask
How much water should I drink a day?
There is no single amount for everyone. Body size, activity, heat, food, health, and other drinks all matter. This calculator gives healthy adults a practical range for today rather than treating one number as a medical rule.
Is eight glasses of water enough?
Eight 8-fl-oz glasses equals 64 fl oz, or about 1.9 liters. It can be a useful reminder, but it is not a universal target. Larger bodies, sweaty activity, and hot conditions may call for more, while food and other drinks also contribute fluid.
Do coffee, tea, and other drinks count?
Most non-alcoholic drinks contribute fluid, including coffee, tea, and milk. Water is still a simple primary choice. The estimate above is a beverage-fluid guide; water in food contributes in addition to it.
Should I drink more when exercising or in hot weather?
Usually, especially when you sweat. The calculator adds a range for planned sweaty activity and heat exposure. Long endurance sessions and hot-weather work need a personal hydration plan based on sweat loss, not this general estimate.
Can drinking too much water be harmful?
Yes. Drinking very large amounts quickly can dilute blood sodium. Spread fluids across the day, follow thirst and conditions, and seek individual advice if you have kidney, heart, liver, or fluid-balance conditions.