Health & Fitness
Water Intake Calculator
Recommended daily water intake based on weight and activity.
How this water intake calculator works
The water intake calculator takes the numbers you enter and applies a standard formula for this kind of calculation, showing the result instantly with no page reload. Recommended daily water intake based on weight and activity.
Everything runs client-side in JavaScript, so your inputs never leave your device — there's no server, no account and no tracking involved in getting your answer.
Frequently asked questions
No — it's a baseline estimate from body weight and exercise alone. Hot weather, high-sodium diets, and illness all increase fluid needs beyond this estimate.