Water Intake Calculator
Professional Water Intake Calculator
Daily Water Intake2.3 L2310 mL
Glasses (250mL)9
US Cups10
Fluid Ounces78 oz
Water Intake Calculator
Professional Water Intake Calculator
Features
- Estimate daily water intake from body weight, activity level, and climate
- Baseline: 30 mL/kg/day (Institute of Medicine / EFSA reference)
- Activity multipliers: sedentary 0.9, light 1.0, moderate 1.1, active 1.25, very active 1.4
- Climate multipliers: cold 0.9, temperate 1.0, hot 1.15
- Output in mL, litres, US fluid ounces, US cups, and ~250 mL glasses
How to use
- Enter your input data in the provided field.
- Configure any options as needed.
- View the results instantly and copy or download the output.
Tips & Best Practices
- The 30 mL/kg baseline is widely cited — for a 70 kg adult that's ~2.1 L/day before activity/climate adjustments.
- Food contributes ~20% of typical water intake; the calculator focuses on drinking water.
- Pregnancy, breastfeeding, and certain medications change requirements significantly — consult a clinician for those.
- Caffeine and alcohol both have diuretic effects; the rule-of-thumb is to drink an equal volume of water alongside.
- Thirst is a lagging indicator — by the time you're thirsty you're already mildly dehydrated. Sip throughout the day.
FAQ
Is this tool free to use?
Yes, completely free with no registration, no limits, and no hidden costs.
Is my data private?
All processing happens in your browser. No data is ever sent to any server or third party.
Does it work offline?
Once loaded, the tool works entirely offline. All processing is done client-side with JavaScript.
Which browsers are supported?
Works in Chrome, Firefox, Safari, Edge, and all modern browsers on desktop and mobile.
Can I use the results commercially?
Yes, all output is yours to use freely in any personal or commercial project without restrictions.