Hydration Estimation

Adequate water intake varies by individual, but a widely accepted baseline algorithm is:

~33 ml of water per kilogram of body weight as a baseline.
Plus ~12 oz (350 ml) for every 30 minutes of exercise to replace lost fluids.

Note: Environmental factors (hot climates, high altitude) and physiological conditions (pregnancy, illness) significantly increase water requirements.

Frequently Asked Questions

Is the Water Intake Calculator free to use?

Yes, the Water Intake Calculator is 100% free to use. There are no subscriptions, no sign-ups, and no hidden fees.

Is my data safe when using the Water Intake Calculator?

Absolutely. All calculations performed by the Water Intake Calculator happen locally in your web browser. We do not store, track, or transmit your inputs or results to any server.

How accurate is the Water Intake Calculator?

Our Water Intake Calculator uses industry-standard formulas and methodology. You can view the exact formula and calculation logic used in the methodology section above to verify the math yourself.

Can I use the Water Intake Calculator on my mobile phone?

Yes! The Water Intake Calculator is fully responsive and works seamlessly on all devices including smartphones, tablets, and desktop computers.