Guide: How It Works

Water (ml) = Weight (kg) ร— 33

Who Is This Calculator For?

  • Anyone building a daily hydration habit
  • Athletes tracking fluid needs

Examples

70 kg: 70 ร— 33 = 2,310 ml/day (~2.3 liters).

Frequently Asked Questions

Does exercise or climate change my water needs?

Yes, this is a baseline estimate; increase intake for heat, exercise, or illness.

Is 33ml per kg a medical guideline?

It's a commonly used general wellness estimate, not a strict medical prescription.

About the Author

This tool is built and maintained by John Britto, a Full-Stack Developer with over 5 years of experience building secure web applications. Our mission is to provide free, private, and reliable tools for everyone.