Water Intake Calculator
Calculate your recommended daily water intake based on weight and activity level.
Water Intake Calculator estimates how much water you should drink each day based on your body weight, activity level, and climate. Adequate hydration supports kidney function, digestion, joint lubrication, temperature regulation, and cognitive performance. Even mild dehydration of 1-2% of body weight can impair concentration and physical performance.
Enter your weight, activity level (sedentary, moderately active, or very active), and whether you live in a hot climate or are pregnant or breastfeeding. The tool calculates your daily water target in liters and cups and gives you a practical guideline for how to spread that intake throughout the day.
The old rule of "8 glasses a day" is a rough approximation. Your actual needs depend on your size, how much you sweat, and the water content of your food (fruits and vegetables contribute significantly). A useful real-world check is the color of your urine β pale yellow indicates good hydration, dark yellow suggests you need to drink more.
Frequently Asked Questions
Code Implementation
def daily_water_intake(weight_kg, activity_level='sedentary',
climate='temperate', exercise_hours=0):
"""
Estimate daily water intake in litres.
Parameters:
weight_kg - body weight in kilograms
activity_level - 'sedentary' | 'light' | 'moderate' | 'active'
climate - 'temperate' | 'hot' | 'cold'
exercise_hours - hours of exercise per day
Returns recommended daily water intake in litres.
"""
# Base: 35 mL per kg of body weight
base_ml = weight_kg * 35
# Activity adjustments (mL/day)
activity_adj = {
'sedentary': 0,
'light': 300,
'moderate': 600,
'active': 900,
}
base_ml += activity_adj.get(activity_level, 0)
# Exercise: ~500 mL per hour
base_ml += exercise_hours * 500
# Climate adjustments
climate_adj = {'temperate': 0, 'hot': 750, 'cold': -250}
base_ml += climate_adj.get(climate, 0)
return round(base_ml / 1000, 2) # convert to litres
def cups_from_litres(litres, cup_ml=250):
"""Convert litres to number of cups."""
return round(litres * 1000 / cup_ml, 1)
# Examples
intake = daily_water_intake(70, 'moderate', 'temperate', 1)
print(f"Daily intake: {intake:.2f} L")
print(f"As cups (250 mL): {cups_from_litres(intake)}")
active = daily_water_intake(85, 'active', 'hot', 1.5)
print(f"Active in heat: {active:.2f} L")Comments & Feedback
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