Water Intake Calculator
Calculator ToolsHow much water you should drink daily
FreePrivateInstant
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History
All history →Water Intake Calculator — at a glance
Estimate your daily water needs from body weight, exercise and weather.
65 kg, light exercise
Run
≈ 2.5 litres
How to use it — step by step
Your weight and how active you are.
1
Enter your values
Fill in the boxes. Sample values are already there so you can see how it works.
2
Calculate
Press the button to get your answer instantly.
3
Read the result
The main answer is shown in a large card with extra details below it.
4
Copy it
Use the copy button to save the result anywhere.
Pro tips
Small things that make the result better.
✦Sip water through the day instead of drinking a lot at once.
✦Pale yellow urine is a simple sign of good hydration.
✦Drink more in summer, when ill or when exercising.
Quick facts
Freeno signup, no limit
Instantresult in a moment
Privatenothing is uploaded
Any devicephone, tablet or PC
Frequently Asked Questions
Is 8 glasses a day correct?+
It is a rough rule. Your own need depends on weight, activity, climate and health.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.
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