Hydration
Water Intake Calculator
Calculate how much water you should drink each day based on body weight and exercise.
How the Water calculator works
Calculate how much water you should drink each day based on body weight and exercise.
Every result on MacroMatrixCalc is based on peer-reviewed equations and adjustable for goal, sex, age and activity. Use the form above to update your numbers — results recalculate instantly so you can compare scenarios.
Frequently asked questions
Yes. Moderate caffeine intake contributes to hydration despite mild diuretic effect.
Recommended products
Curated supplements and gear for this calculator will appear here soon.