Water Intake Calculator
Estimate a daily water intake goal. The baseline uses ~35 ml per kilogram of body weight, then adds for activity level, hot-weather exposure, and pregnancy or lactation. See the total in millilitres, litres, US fluid ounces, and glasses (250 ml). Runs entirely in your browser.
Baseline ≈ 35 ml per kg of body weight per day (a common guideline; the U.S. National Academies suggest ~3.7 L/day for men and ~2.7 L/day for women from all fluids). Additions: light +250 ml, moderate +500 ml, intense +1000 ml; hot +500 ml, very hot +1000 ml; pregnancy +300 ml, lactating +700 ml. About 20% of intake normally comes from food. This is a general estimate — thirst, climate, and medical conditions all matter; consult a provider for personal advice. Runs locally.