Water Intake Calculator
Daily hydration target based on weight, activity and climate.
kg
min
Daily water
2.66L
about 11 glasses
In millilitres
2,660ml
In US cups
11.2
Baseline (no exercise)
2.31L
ShowHide the working
- 1Base = 70 kg × 33 ml = 2,310 ml
- 2+ 30 min exercise
- 3= 2,660 ml
Formula
≈ 33 ml/kg + exercise + climateHow it works
A rough daily hydration target from body weight, exercise and climate. Food and other drinks also contribute.
Example
A 70 kg person doing 30 min of exercise needs about 2.66 L.
For general information only, not medical advice. Individual needs vary — consult a qualified health professional. Thirst and urine colour are better day-to-day guides.
About the Water Intake Calculator
Daily hydration target based on weight, activity and climate. It sits in the Health & Fitness section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Water Intake Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The Water Intake Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the Water Intake Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Health & Fitness?
- BMI, body fat, calories, macros, heart rate and training numbers. You can browse the full Health & Fitness category for related calculators.