Water Intake Calculator

Estimate a daily water target from body weight and activity duration.

Water Intake Calculator helps you a simple fluid target from body weight and activity time. Enter weight and exercise time per day, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Water intake calculator does Water Intake Calculator is built for body measurements, calories, and everyday health math. A simple fluid target from body weight and activity time. You enter weight and exercise time per day, then Simple Calculators computes the result instantly. These tools use widely published formulas. They are educational screens, not a diagnosis. How the math works Base 33 ml per kg, plus about 350 ml per 30 minutes of activity. The formula: Water (L) = 0.033 × weight (kg) + 0.35 × (exercise minutes ÷ 30). Not a medical fluid prescription.