Daily Water Intake Calculator
Estimate how much water you should drink each day based on your weight, activity level and climate.
Estimate a sensible daily water intake target based on your body weight, activity level and the climate you live in.
How to use it
- 1Enter your weight and choose units.
- 2Select your activity level and climate.
- 3See your recommended daily water intake.
Your details
Enter your weight, activity level and climate for a hydration target.
Not medical advice
Result
Recommended daily water intake
2.66 L
- In fluid ounces
- 90 fl oz
- In cups
- 11.2 cups
Based on 33ml per kg of body weight, plus adjustments for activity and climate.
Frequently asked questions
- Does coffee or tea count towards water intake?
- Most fluids contribute to hydration, but plain water remains the best default choice for this estimate.
- Do I need more water when exercising?
- Yes, this calculator adds extra fluid for higher activity levels to account for sweat losses.
- Is this a medical recommendation?
- No, it's a general estimate. People with certain medical conditions should follow guidance from a healthcare provider.
Something wrong with this tool or its numbers?
Report an issueRecommended next
What people usually reach for after this tool.
BMI Calculator
Calculate your Body Mass Index in metric or imperial units and see your WHO weight category instantly.
Daily Calorie Calculator
Calculate your daily calorie needs to lose, maintain or gain weight based on your TDEE and goal.
BMR Calculator
Estimate your Basal Metabolic Rate with the Mifflin-St Jeor formula and see your daily calorie needs (TDEE).
Related articles

What BMI tells you, and what it definitely does not
BMI is a fast population-level screen. Here is how to read it without over-interpreting it.
5 min read
How to price freelance work without guessing
A repeatable pricing method built on utilisation, target income and value-based adjustments.
7 min read
VAT explained simply for small businesses
What VAT actually is, when you have to register, and how to keep the arithmetic painless.
6 min readPopular tools
The calculators people reach for most.
New tools, every week
One short email when we ship something genuinely useful. No spam, unsubscribe anytime.