About the Water Intake Calculator
Estimate how much water you should drink every day. This tool is free, works in your browser and needs no sign-up.
How to use the Water Intake Calculator
Enter your weight in kilograms and your daily exercise time in minutes.
Formula used
Water (litres) = weight × 0.033 + 0.35 for each 30 minutes of exercise.
Example
A 70 kg person who exercises 30 minutes needs about 2.66 litres per day.
Frequently asked questions
Is the Water Intake Calculator free to use?
Yes. It is completely free and you can use it as many times as you like.
How accurate is the Water Intake Calculator?
The calculator uses standard formulas, so the maths is exact. Real life results can differ because of fees, taxes, rounding or personal factors, so treat the answer as an estimate.
Do you store the numbers I enter?
No. All calculations run in your browser. The values you type are not sent to our server.
Disclaimer: results are estimates for information only. They are not financial, medical or professional advice.