💧 Water Intake Estimator
Enter your weight and activity to get a rough daily water target, in glasses and litres.
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How to use Water Intake Estimator
- Enter your numbers
Use the sliders and boxes.
- Watch it update
Results change live as you type.
- Read the breakdown
Totals, bars and a silly verdict.
- Save or share
Save results to compare later.
What makes Water Intake Estimator fun
Both units.
Exercise adds water needs.
No submit button needed.
The formula is shown on the page.
About this tool
Water Intake Estimator gives a rough daily water target based on your weight and how active you are. It uses a common rule of thumb of around 30 to 35 millilitres per kilogram of body weight, plus extra for exercise and hot weather.
The estimate is a starting point. Thirst, urine colour and how you feel are useful guides. If you have a medical condition that affects fluids, follow your doctor's advice.
Who it's for
A daily target.
Extra for training.
Desk-day hydration.
Tips & tricks
- Keep a bottle at your desk.
- Drink a glass with each meal.
- Check the colour of your urine as a simple guide.
Little questions about Water Intake Estimator
Is this medical advice?
No. Ask a doctor if you have a condition that affects your fluid needs.
How is the target calculated?
A rule of thumb of about 30 to 35 ml per kg, with extra for activity.
Does it track my water?
No, it only estimates a target.
Is Water Intake Estimator free?
Yes. Water Intake Estimator is free, needs no sign-up and runs in your browser on phones and computers.
Is my data stored?
Only results you save, in your own history linked to a random ID — never your name.
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