Daily Water Intake Calculator
How much water should you drink each day? · free, no signup
Free Daily Water Intake Calculator — How Much Should You Drink?
Water makes up around 60% of the adult body and supports digestion, temperature control, joints and concentration. How much you need depends on your body size, how active you are and the weather. A common guideline is about 30–35 ml per kilogram of body weight, plus extra for exercise and heat.
Enter your weight, the minutes of exercise you do per day and the climate you live in, and this calculator gives a personalised daily target in litres, US ounces and standard 250 ml glasses. It is a helpful reminder to build a hydration habit — not a medical prescription.
Key features
Personalised target
Based on your weight, activity and climate.
Three units
Litres, fluid ounces and 250 ml glasses.
Exercise adjustment
Adds water for every 30 minutes of activity.
Simple and private
No account needed.
How to use it
- Enter your weight and unit.
- Enter your daily exercise time.
- Choose your climate.
- Read your daily water target.
Worked example
Example
70 kg, no exercise, temperate climate → 2.45 L (83 oz, ≈ 10 glasses) 70 kg, 60 min exercise, hot climate → 3.65 L
Who uses this tool
Everyday users
Build a hydration habit.
Runners and gym-goers
Adjust intake around training.
People in hot climates
Avoid dehydration in summer.
Tips for the best results
- Spread your water through the day rather than drinking it all at once.
- Drink a glass on waking and with each meal.
- Pale yellow urine usually means you are hydrated.
- Fruit, vegetables and soups also count towards fluid intake.
Common mistakes to avoid
- Drinking large amounts very quickly.
- Waiting until you are thirsty during exercise.
- Ignoring medical advice on fluid limits if you have a health condition.
Why use AZRS QuickFix?
It is 100% free, needs no signup and has no watermark or usage limits. The tool runs in your browser, so what you type stays on your device, and it works on phones, tablets and desktops. New tools are added every week — bookmark this page or browse the full QuickFix toolbox.
Frequently asked questions
How much water should I drink a day?
About 30–35 ml per kg of body weight, more with exercise or heat — commonly 2–3 litres.
Do coffee and tea count?
Yes, they contribute to fluid intake, though water is best.
Can you drink too much water?
Yes, though it is rare; do not exceed what a doctor advises.
Does exercise change the amount?
Yes, add roughly 350 ml for every 30 minutes of exercise.
Is this medical advice?
No, it is a general estimate.
Is it free?
Yes.