Water Intake Calculator by Body Weight
Daily water target from weight and activity.
Enter your values
ⓘ Live results
Results
- 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
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.
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.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.