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Water Intake Calculator

A simple daily water-intake sketch from body weight and climate/activity hints — not a medical fluid-restriction plan.

Estimates only — not professional financial, medical, legal or engineering advice. Read full disclaimer.

Result

Fill in the form and click Calculate to see your result here.

How it's calculated

Approximate litres from body-weight heuristic encoded in the handler, optionally adjusted by activity if that field exists.

Example

Example: Water Intake Calculator

Inputs

  • Weight Kg: 70
  • Exercise Minutes: 0
  • Climate: normal

Outputs

  • Daily Water Intake: 2.31
  • Daily Water Intake Glasses: 10

This example uses typical sample values. Adjust the inputs above to see how the results change for your own numbers.

About this calculator

Hydration internet rules (ml per kg) are starting points. This calculator applies the handler’s weight-based estimate so you have a litre target, then you still listen to thirst, urine colour, and a clinician if you have kidney or heart disease.

Monsoon humidity and high-altitude trekking change needs more than a website. This is not ORS dosing.

Frequently Asked Questions

A wellness heuristic: 33 ml per kg body weight (0.033 L/kg), plus 350 ml per 30 minutes of exercise, plus 500 ml if climate is hot/humid. Glasses assume 250 ml. It is not an EFSA/WHO clinical fluid prescription.
EFSA adequate intakes are population averages from food+drink. This page is a per-kg rule plus extras. If they conflict, the clinical guideline and your doctor win — especially in kidney, heart or hyponatremia risk.
Encoded handler extra, not sweat calorimetry. Humid cricket practice can need more; desk work moins.
Flat add-on when you pick hot/humid. Desert trekking still needs a plan, not only this flat.
Not subtracted. Total water includes food moisture in many nutrition tables.
Requirements differ. Do not use the adult 33 ml/kg rule blindly.
More water is not always safer. This tool cannot see your labs.
Convert to kg first (weight converter: 1 lb = 0.45359237 kg).
The “8×250 ml” slogan is not a universal medical law. This engine derives glasses from litres/0.25, not from that slogan.
No. Educational hydration sketch only.

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