How much water do I need?

A general rule is ~33-35ml per kg of body weight, plus extra for exercise and hot weather.

Yes, but plain water is best. Coffee has a mild diuretic effect but still contributes to total fluid intake.

Can I drink too much?

Yes, water intoxication (hyponatremia) is real but rare. Spread your intake throughout the day.

Water Deficit Calculator

Calculate your daily hydration goal based on weight and activity, and track your current intake.

water intakehydrationdehydrationwater tracker

Disclaimer: This tool provides estimates for informational and educational purposes only. It does not constitute professional financial, medical, or legal advice. Please consult with a qualified professional before making any significant decisions based on these estimations.

Common Use Cases

general awareness and educational estimates
wellness planning alongside professional guidance
tracking simple ranges over time

What is Water Deficit Calculator?

The Water Deficit Calculator helps you determine exactly how much water you should drink daily based on your body weight and activity level. It then compares this goal to your current intake to show your 'water deficit'—how much more you need to drink to stay optimally hydrated.

How to Use This Tool

1Enter your weight and exercise duration
2Enter how much water you've drunk today
3View your hydration status and remaining goal

Example

Input

Weight: 75kg, Activity: 30min

Output

Goal: 2800ml

Before You Rely on This Result

UtilityNest keeps tools in this category focused on transparency: short instructions, a worked example, and plain-language guidance so you can review the result before you depend on it.

Check that the inputs reflect your real situation before you rely on the estimate.
Rules, rates, health needs, and legal requirements may vary by country, state, insurer, or provider.
Use this result as a starting point, then confirm important decisions with official sources or a qualified professional.

Frequently Asked Questions

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