Hydration targets vary by body, climate and activity. The ChrysoKit Water Intake Calculator gives you a personalised daily estimate from a handful of inputs, in metric or imperial.
Why use it
"Drink eight glasses" is a one-size-fits-all rule that ignores everything specific to you. Five inputs gives a usable, personalised number.
How to use the Water Intake Calculator
- Pick metric or imperial units.
- Enter your age, biological sex, weight and height.
- Pick an activity level (sedentary to very active).
- Pick a climate (temperate, hot, cold or humid).
- Read the suggested daily intake.
Features worth knowing
Personalised estimate
The formula combines age, sex, body weight, height, activity and climate, rather than a single rule of thumb.
Metric and imperial
kg/cm or lbs/in, ml or fl oz. Pick the one your scale and your water bottle already use.
Practical guidance
The result is shown both as total fluid and as a number of common glass sizes, so it translates to "drinks per day" not just "ml".
Pro tips
- Coffee, tea and food all count toward total daily fluid intake. Pure water is not the only contributor.
- Thirst is a late signal. If you only drink when thirsty, you are usually already a bit behind.
- Hot weather and intense exercise can push intake well above the baseline. Adjust upward on those days.
Privacy first. The Water Intake Calculator runs entirely in your browser. Nothing you enter is uploaded.
This is a guideline, not medical advice. If you have specific health conditions, defer to a clinician for your real target.
Open the tool: Water Intake Calculator →