Calculate how much water you should drink daily. Free water intake calculator.
This water intake tool lets you calculate your recommended daily water intake based on body weight and activity level. It is designed for speed and accuracy, running entirely in your browser with no data sent to any server. Whether you are a student, professional, or simply need a quick answer, this calculator provides instant results with clear explanations. The baseline recommendation is approximately 35 ml per kilogram of body weight per day. The calculator adjusts upward for physical activity, hot weather, and pregnancy or breastfeeding. Results are shown in liters, cups, and glasses for practical daily tracking.
The baseline recommendation is approximately 35 ml per kilogram of body weight per day. The calculator adjusts upward for physical activity, hot weather, and pregnancy or breastfeeding. Results are shown in liters, cups, and glasses for practical daily tracking.
Health-conscious individuals ensure adequate daily hydration. Athletes calculate increased water needs during training and competition. Medical professionals advise patients on hydration goals for specific conditions. Travelers adjust water intake for hot climates and high altitudes. Parents determine appropriate water intake targets for children.
You might also find these calculators useful: Calorie Intake Calculator · BMI Calculator · Ideal Weight Calculator · Sleep Calculator · Body Fat Calculator.
Yes, this Water Intake calculator is completely free with no signup, no account creation, and no usage limits. All calculations run locally in your browser, so your data stays private and results appear instantly.
This calculator uses standard mathematical formulas and internationally recognized conversion factors. Results are displayed with up to six significant digits of precision. For most everyday uses, the results are more than accurate enough.
Yes, the calculator is fully responsive and works on smartphones, tablets, and desktop computers. The interface automatically adjusts to your screen size. Touch inputs and on-screen keyboards work seamlessly.
Once the page has loaded in your browser, the calculator works without an internet connection. All computation happens locally using JavaScript. Bookmark the page for quick access anytime.
This calculator uses standard, well-established formulas that are widely accepted in education, science, and professional practice. The specific formula is explained in the "How it works" section above.