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Hydration estimate

Calculate hydration estimate using the values and assumptions you provide.

Calculate hydration estimate using the values and assumptions you provide.

Both dots and commas are accepted as decimal separators.

Your inputs stay in your browser. Displayed results are rounded to a maximum of 12 significant digits.

Method and assumptions

Method version 1.0.0 · Updated

Calculate

Formula: Estimate = weight × assumed mL/kg

Calculate hydration estimate using the values and assumptions you provide.

weight
Weight (kg)
mlPerKg
Milliliters per kg (assumption)

Rule-of-thumb estimate only. Individual needs vary with climate, activity, health and diet.

Calculate with code

These short examples use the same inputs and core calculation as this tool. Adapt validation and formatting to your application.

JavaScript
const weightKg = 70, mlPerKg = 35;
console.log(weightKg * mlPerKg); // 2450 ml/day estimate
TypeScript
const weightKg = 70, mlPerKg = 35;
const mlPerDay: number = weightKg * mlPerKg;
console.log(mlPerDay); // 2450 ml/day estimate
Python
print(70 * 35)  # 2450 ml/day estimate
Java
System.out.println(70 * 35); // 2450 ml/day estimate
C#
Console.WriteLine(70 * 35); // 2450 ml/day estimate