Daily Water Intake Calculator
From your weight, see roughly how much water to drink each day. Common rule: about 33 mL per kg.
Quick answer
70 kg: about 2.3 L a day.
How it is calculated
- Water (litres) ≈ weight (kg) × 0.033.
- 70 × 0.033 = 2.31 litres.
- Needs rise in heat, with heavy sweating or exercise.
Worked example
A person weighing 70 kg needs about 2.3 L of water a day, roughly 9–10 glasses (250 mL).
| Weight | 70 kg |
| Water | 2.3 L |
Formula
Water = Wk×0.033
Good to know
- Tea, milk, dal and fruit also provide water.
- With kidney or heart disease, follow your doctor’s limit.
Questions people ask
How much water should I drink a day?
Roughly weight × 33 mL; about 2 litres at 60 kg.
Can too much water harm?
Drinking a very large amount in a short time is not good; drink by thirst.
How much more in summer?
Half a litre to a litre more, depending on sweat.
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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0