Water Intake Calculator
Calculate how much water you should drink daily based on weight, activity level, and climate.
lbs
Daily Water Intake
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In Liters —
In Cups —
Water Bottles (16.9oz) —
How to Use This Calculator
Enter your weight, activity level, and climate. The calculator shows your recommended daily water intake in ounces, liters, cups, and standard water bottles.
Formula
Base intake = Body weight (lbs) × 0.5 oz
Activity multiplier: Low 1.0 | Moderate 1.2 | High 1.5
Climate multiplier: Cold 0.9 | Temperate 1.0 | Hot 1.15
Activity multiplier: Low 1.0 | Moderate 1.2 | High 1.5
Climate multiplier: Cold 0.9 | Temperate 1.0 | Hot 1.15
Example
Example: 170 lbs, moderately active, temperate climate: 170 × 0.5 × 1.2 × 1.0 = 102 oz (3.0 L, ~13 cups, ~6 water bottles).
Frequently Asked Questions
- A common baseline is half your body weight in ounces. A 170 lb person would aim for ~85 oz (about 10 cups). Active individuals and those in hot climates need more.
- Yes, moderate coffee and tea intake counts toward hydration. While caffeine has a mild diuretic effect, the fluid content more than compensates.
- Dark yellow urine, dry mouth, headache, fatigue, and dizziness are common signs. Aim for pale yellow urine as a hydration indicator.
- Yes, though rare. Excessive water intake can cause hyponatremia (low sodium). This typically only occurs with extreme consumption (several liters in a short time).