Health & Fitness Calculators
Water Intake Calculator
Estimate a daily water intake target based on your body weight and minutes of daily exercise.
Quick guide
Enter your body weight and the minutes you exercise per day to get a daily water target. The estimate scales with weight and adds fluid for sweat lost during exercise; climate and health conditions can change your needs.
Read the full explanationHow It Works
A common hydration guideline scales with body weight, then adds extra fluid to replace sweat lost during exercise. Climate, pregnancy, and health conditions also change needs.
Formula Used
Water (L) ≈ weight (kg) × 0.033 + (exercise minutes ÷ 30) × 0.35.
Example Calculation
At 70 kg with 30 minutes of daily exercise, the estimate is about 2.7 liters per day.
Practical Use Cases
- Set a daily hydration goal.
- Adjust intake on training days.
- Build a drinking schedule around glasses or bottles.