Health · Free tool
Daily Water Intake
Indian summers easily push needs to 4+ litres / day. Use weight, climate and activity to set a realistic target.
How the recommendation is built
We start with the ICMR baseline of about 35 ml per kg of body weight (so 70 kg ≈ 2.45 L), then add adjustments: +500 ml for hot weather (28–35 °C), +1000 ml for extreme heat (> 35 °C), and +500–1000 ml for moderate-to-vigorous physical activity. About 20% of fluid comes from food (dal, curd, fruits) — the rest is what you actually drink.
Worked example
A 65 kg office worker in Bengaluru in winter needs roughly 2.3 L/day. The same person in a Chennai May heatwave with a 30-minute evening walk needs around 4.0 L/day. A 75 kg construction worker in Jaipur in June can need 5.0–5.5 L — dehydration risk is real and is the leading cause of UTI flare-ups and kidney stones in summer admissions across north Indian hospitals.
When to use this
- Setting a bottle-fill target during Indian summer (Apr–Jun)
- Pregnant or breastfeeding women — add 300 ml and 700 ml respectively
- Tracking hydration during fasts like Karva Chauth or Ramzan windows
- Recovery after a stomach bug or fever — needs increase 500–1000 ml
Pair this with the BMI calculator for a baseline body assessment, or our TDEE calculator to align hydration with calorie spend.
FAQ
Does coffee / tea count toward water intake?
Yes — caffeine's diuretic effect is much smaller than the water content. Tea, coffee, buttermilk, soup, watermelon — all count. Soft drinks do too but their sugar isn't worth it.
Can I drink too much water?
Yes — hyponatremia (over-dilution of blood sodium) is rare but real. Typical safe upper limit is ~5L/day for an average adult. Marathon runners and labourers in extreme heat may exceed this safely.
Should I sip slowly or chug?
Sip steadily through the day. Chugging 1L at once just makes you pee — your body can only absorb ~600-800ml per hour. Aim for water alongside meals and after every washroom break.