How Much Water To Drink Per Day
Use this daily water intake calculator to estimate how much water you should drink per day based on your body weight. Add your daily activity minutes and toggle hot climate if you train in heat or sweat heavily. We show a simple target in ounces (oz) and liters (L). US units (lb) are the default, with a metric (kg) toggle. If you want a more detailed estimate for training duration, temperature, and sweat rate, use the training hydration calculator. Results are estimates and not medical advice. See Methods & assumptions.
Daily water intake
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Methods & assumptions
This variant focuses on How Much Water To Drink Per Day.
This calculator estimates daily water intake from body weight, then adds a simple exercise and heat adjustment. US units are the default, with a metric toggle.
Formulas
Baseline: 0.5 oz per lb OR 35 ml per kg Activity add-on: 12 oz per 30 minutes of activity Hot climate add-on: +12 oz Rounding: oz -> whole numbers liters -> 1 decimal
If you train in heat, sweat heavily, or want a range-based target, use the training hydration calculator.
More variants
Focused on water intake calculator by weight.
Focused on hydration calculator simple.
Questions & Answers
Clear answers, so you can use this tool with confidence.
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