Daily Water Intake Calculator
Find out how much water you should drink each day based on your body weight, climate, and exercise level.
About this calculator
This calculator estimates your daily water intake target using a weight-based baseline (0.5 fl oz per pound of body weight) adjusted by two multipliers: climate and exercise frequency. A warmer climate or more intense exercise increases fluid losses through sweat and respiration, raising the target accordingly. The result is shown in fluid ounces, liters, and standard 8 oz glasses. All estimates are general guidelines — individual hydration needs vary based on health conditions, diet, and other factors.
Field explanations
- Units
- Imperial uses pounds for weight; metric uses kilograms. The result is shown in fl oz (imperial) or liters (metric) as the primary unit, with the other displayed as a secondary row.
- Body weight
- Your current body weight in pounds or kilograms. Heavier individuals require more water to maintain proper hydration.
- Climate
- The typical climate you live or work in. Hot and humid conditions increase sweat output, raising your hydration needs by up to 20%.
- Exercise frequency
- How often you exercise per week. More frequent or intense workouts increase fluid losses — intense daily exercise adds up to 35% to your baseline target.