Where does the 33 ml/kg figure come from?

This is a general rule of thumb often used by nutrition professionals to roughly estimate an average adult's daily fluid needs based on body weight. Actual needs vary from person to person.

Are drinks like coffee and tea included in this?

No, this tool only calculates total water/fluid needs; you'll need to separately track how much you're consuming from various beverages. Keep in mind caffeinated drinks can have a mild diuretic effect.

How should I choose my activity level?

If you move very little day to day, choose "Sedentary"; if you take regular light walks, choose "Lightly Active"; if you exercise at a moderate intensity a few times a week, choose "Moderately Active"; and if you train intensely and frequently, choose "Very Active".

Is this result equally accurate for everyone?

No, this is a general estimate; factors like climate, health conditions, or pregnancy/breastfeeding can change your actual needs. If you have a specific health condition, consult a doctor or dietitian.

Tools/❤️ Health/Water Intake Calculator

Water Intake Calculator

Find your daily water needs based on weight and activity level.

Version 1.0 · Last Updated: August 3, 2026 · Maintained by ToolLarder

Water Intake Calculator

Frequently Asked Questions