Water intake calculator

How it works

Enter your weight and how many minutes you exercise a day.

The formula

Daily water ≈ weight (kg) × 0.033 litres, plus about 0.35 litres for every 30 minutes of exercise.

Worked example

72 kg with 30 minutes of exercise: 72 × 0.033 = 2.38 L, plus 0.35 L = about 2.7 litres, roughly 11 glasses of 250 ml.

Good to know

• You need more in hot weather, when fasting and when unwell.
• Food and other drinks count toward the total.