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Water Intake Calculator

How much water should you drink each day? Enter your weight, activity level, climate and any creatine intake to get a personalised hydration target in liters, ounces, cups and bottles — with a clear breakdown of where each part of the number comes from.

Water intake calculator

Adds ~250 ml of water per gram of creatine.

Recommended daily intake
3.0liters / day
≈ 100 fl oz · 12.3 cups · 5.9 × 500 ml bottles
  • Body-weight baseline+2.5 L
  • Workout intensity+0.5 L
  • Climate adjustment+0.0 L
  • Creatine adjustment+0.0 L

Estimates only. Individual needs vary with health conditions, medications and sweat rate. Talk to a clinician for medical advice.

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How this water intake calculator works

The calculator starts with a body-weight baseline of about 35 ml of water per kilogram (roughly half an ounce per pound), then layers on three adjustments: a workout-intensity bonus, a climate bonus for warm or hot environments, and an extra 250 ml per gram of creatine to offset the water that creatine pulls into muscle cells. The result is shown in liters, fluid ounces, 240 ml cups and 500 ml bottles so it is easy to translate into the containers you actually use.

These numbers are a planning baseline, not a medical prescription. Thirst, urine colour and how you feel during workouts are still the best day-to-day signals — adjust up on hot days or long sessions, and down on cold, low-activity days.

Frequently asked questions

How much water should I drink per day?
A good baseline is about 35 ml per kilogram of body weight (roughly half an ounce per pound). The calculator above adjusts that baseline for your activity level, climate, and any extra hydration needs from creatine.
Why do I need more water when taking creatine?
Creatine pulls water into your muscle cells, which is part of how it supports strength and recovery. Most coaches suggest adding around 250 ml of water per gram of creatine you take each day on top of your normal intake.
Does workout intensity change how much I should drink?
Yes. Light activity adds little, moderate workouts typically add around 500 ml, and intense or long sessions can add a liter or more — especially in hot climates.
Can I drink too much water?
Yes — very large volumes consumed quickly can cause hyponatremia. Spread your intake across the day and listen to thirst cues.
Is this water intake calculator free?
Yes. The calculator is free, runs entirely in your browser, and does not require an account. It is general guidance only — talk to a doctor or dietitian for personalised medical advice. Have feedback? Contact the team.

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