Water Intake Calculator

Calculate daily water intake recommendation.

How to Do It Manually

Daily water intake is based on weight and activity level. The common recommendation is half your body weight in ounces, plus extra for exercise.

Daily Water = (weight in lbs ÷ 2) ounces + 12 oz per 30 min of exercise
  1. Weigh yourself in pounds.
  2. Divide by 2 to get your base daily ounces.
  3. Add 12 oz for every 30 minutes of exercise.
  4. Convert to liters if needed (1 liter ≈ 33.8 oz).

Frequently Asked Questions

How much water should I drink per day?

A common recommendation is 8 glasses (64 oz), but individual needs vary based on weight and activity.

Does water from food count?

Yes, about 20% of daily water comes from food. The 'drink' recommendation accounts for this.