Water Intake Calculator by Body Weight
Daily water target from weight and activity.
Enter your values
Enter the weight in kg.
Enter the daily exercise in minutes.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Daily water target
- 2.98 L
- Base need
- 2.48 L
- Exercise addition
- 0.5 L
- In cups (240 ml)
- 12
Quick answer
A common baseline is about 33 ml of water per kilogram of body weight, plus extra for exercise.
water = weight x 33 ml + 500ml per 30 min exercise
At a glance
| What it does | Daily water target from weight and activity. |
|---|---|
| Category | Health |
| Inputs needed | Weight, Daily exercise |
| Main output | Daily water target |
| Formula | water = weight x 33 ml + 500ml per 30 min exercise |
| Cost | Free — no sign-up, no download |
How to use the Water Intake Calculator by Body Weight
- 1Enter your body weight and typical daily exercise minutes.
- 2Hot climates, high altitude and pregnancy raise fluid needs further.
- 3This is a general guideline — thirst and urine colour are also good practical indicators.
Inputs explained
- Weight(kg)
- Enter the weight in kg.
- Daily exercise(minutes)
- Enter the daily exercise in minutes.
Worked example
Using the values the calculator loads with:
Inputs
- Weight75 kg
- Daily exercise30 minutes
Results
- Daily water target2.98 L
- Base need2.48 L
- Exercise addition0.5 L
- In cups (240 ml)12
Frequently asked questions
Does coffee count?
Yes, in moderation caffeinated drinks still contribute to hydration despite the mild diuretic effect.
Can I drink too much?
Yes — extreme overconsumption can cause dangerously low sodium (hyponatremia); balance with electrolytes during long exercise.
What do I need to enter into the Water Intake Calculator by Body Weight?
Just 2 values: weight, daily exercise. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Water Intake Calculator by Body Weight work out the answer?
A common baseline is about 33 ml of water per kilogram of body weight, plus extra for exercise. It applies the formula water = weight x 33 ml + 500ml per 30 min exercise and shows the working so you can check each step by hand.
Is the Water Intake Calculator by Body Weight free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.