💧 Water Intake Calculator

Calculate your recommended daily water intake based on your weight, activity level, and climate.

Your Details

Daily Water Intake
0 L
In US Fluid Ounces
0 fl oz
In Cups (8 fl oz)
0 cups
In 500ml Bottles
0 bottles
Minimum (base)
0 L

How Much Water Do You Need?

Water needs vary significantly by individual. The common "8 glasses a day" guideline is a rough approximation. This calculator uses your weight, activity, and environment to give a more personalized estimate.

Base intake = 35 ml × body weight (kg)
+ Activity adjustment (0–1.3 L)
+ Climate adjustment (0–0.6 L)
+ Special conditions (pregnancy/breastfeeding)

Signs of Dehydration

  • Dark yellow urine (pale straw color is ideal)
  • Headache, fatigue, difficulty concentrating
  • Dry mouth and increased thirst
  • Decreased urine output

Tips to Stay Hydrated

  • Drink a glass of water first thing in the morning
  • Keep a reusable water bottle visible at your desk
  • Eat water-rich foods (cucumber, watermelon, strawberries)
  • Set reminders every 1–2 hours
  • Drink before, during, and after exercise
Does coffee or tea count toward daily water intake? +
Yes — moderate amounts of coffee and tea contribute to hydration despite being mild diuretics. The water in caffeinated beverages more than offsets the diuretic effect at typical consumption levels (1–3 cups/day). However, plain water, herbal teas, and water-rich foods are preferred sources.
Can you drink too much water? +
Yes — hyponatremia (water intoxication) can occur when you drink excessive amounts in a short period, diluting blood sodium levels. This is rare and typically only seen in endurance athletes who drink too much plain water during long events without electrolyte replacement. For most people, drinking to thirst is sufficient.