💧 Water Intake Calculator
Hydration is essential for body function. How much water you need depends on your weight, activity level, climate and health. This calculator computes your daily water intake based on scientific research.
Daily water (ml)
0 ml
Daily water (liters)
0 L
Cups per day (8oz)
0 kopjes
Calculate base water intake: 70 kg × 33 ml/kg = 2,310 ml
Adjust for activity level: 2,310 ml × 0 = 0 ml
Formula
Daily water = Body weight (kg) × 33 ml/kg × Activity multiplier. The 33 ml/kg rule is the basic recommendation from the "Adequate Intake" standard.
Base water intake is approximately 33 ml per kg of body weight. This is increased based on your activity level (sedentary = no increase, very active = 2× increase). People who exercise more or live in warmer climates need more water.
Steps
- 1Enter your body weight in kilograms.
- 2Select your activity level (sedentary to very active).
- 3The calculator computes your daily water intake in milliliters and liters.
- 4Spread your water intake over the day — drink regularly in small amounts.
Activity multipliers and guidelines
| Activity level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.0 | No regular exercise |
| Lightly active | 1.2 | 1-3 days per week light exercise |
| Moderately active | 1.5 | 3-5 days per week moderate exercise |
| Very active | 2.0 | 6-7 days per week intense exercise |
Adjust the multiplier to your lifestyle and climate — hot weather increases water needs.
commonMistakes
- Counting all liquids equally — caffeine, alcohol and salt affect water loss and need.
- Ignoring water from food — fruits and vegetables contain 70-95% water.
- Not adjusting for climate — hot/humid weather increases water needs; dry weather increases evaporation.
useCases
- Health and fitness tracking — ensure proper hydration for optimal performance.
- Daily planning — spread your water intake over the day for consistent levels.
- Health and wellness programs — guiding clients on proper hydration.