Skip to content
Allin
Sign up · Sign in

Water intake calculator

Estimate how much water to drink per day.

Related tools

All Nutrition tools →
Fiber intake calculatorFind your recommended daily fiber from sex and age (IOM).Daily sugar intake calculatorFind your WHO free-sugar limit from your daily calorie intake.Sodium intake calculatorSee your recommended daily sodium limit based on age.Protein intake calculatorEstimate your daily protein needs from your body weight and activity.Caffeine intake calculatorEstimate a safe daily caffeine limit for a healthy adult.Baby Milk Intake CalculatorBottle volumes per feed and per day by your baby's weight and age, with the feeding interval.Calories per meal calculatorSplit your daily calorie target evenly across your meals.Alcohol Calorie CalculatorAdd up the calories of a drinking session from a library of beers, wines, spirits and cocktails, with a custom-drink option.

Enter Weight (kg), Exercise (min/day), Sex, Climate and the Water intake calculator works out Water to drink per day, Glasses of 250 mL, Total water, food included straight away. For instance, with Weight (kg) = 70, Exercise (min/day) = 30, Sex = Male and Climate = Temperate it returns Water to drink per day = 2.66 L, Glasses of 250 mL = 11 and Total water, food included = 3.325 L.

How to use it

  1. Enter your values: Weight (kg), Exercise (min/day), Sex, Climate.
  2. Read the result instantly: Water to drink per day, Glasses of 250 mL, Total water, food included.

Frequently asked questions

What does the Water intake calculator actually compute?

It takes Weight (kg), Exercise (min/day), Sex and Climate and derives Water to drink per day, Glasses of 250 mL and Total water, food included from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

4 values: Weight (kg), Exercise (min/day), Sex and Climate. Nothing else is required — no account, no file upload.

Can you show a worked example?

With Weight (kg) = 70, Exercise (min/day) = 30, Sex = Male and Climate = Temperate, the calculator returns Water to drink per day = 2.66 L, Glasses of 250 mL = 11 and Total water, food included = 3.325 L. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Weight (kg) = 77, Exercise (min/day) = 60, Sex = Female and Climate = Hot or humid instead, Water to drink per day goes from 2.66 L to 3.36 L — which is why it is worth testing a few scenarios rather than trusting a single figure.

Which “Sex” option should I choose?

You can pick between « Male » and « Female ». Each one changes what the calculator works out, so switch and compare — the default is « Male ».

What does it give for smaller values?

Scaled down to Weight (kg) = 63, Exercise (min/day) = 15, Sex = Male and Climate = Temperate, Water to drink per day comes out at 2.254 L. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Planning meals against a target, checking whether a habit covers the recommended intake, and translating a label into what it means for the day.

What is the most common mistake?

Treating a daily target as a daily requirement. Reference intakes are population averages over time; a day above or below one means nothing on its own.

What is the difference between the Water intake calculator and the Fiber intake calculator?

This one returns Water to drink per day and Glasses of 250 mL; the Fiber intake calculator returns Recommended fiber. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Daily sugar intake calculator is the closest one after this: Find your WHO free-sugar limit from your daily calorie intake.

Further reading

All guides →
ExplainerHow Much Water Should You Drink a Day?How much water you really need depends on your body weight, activity and climate — not a fixed "8 glasses". Here is how to estimate your daily target.ExplainerHow Much Fiber Per Day Do You Need?Daily fiber targets of 25 to 38 grams by sex and age, why fiber matters for digestion and heart health, and the best food sources to hit your goal.ExplainerHow Much Sodium Per Day Is Safe?The 2,300 mg FDA limit, the 1,500 mg ideal from the AHA, and why most sodium is hidden in packaged food — plus how to read labels and cut back.ExplainerHow Much Caffeine Is Safe Per Day?The 400 mg daily guideline for adults, how much caffeine is in coffee, tea, cola and energy drinks, and why sensitivity varies from person to person.How-toHow to Estimate Your Conception DateEstimate conception from your last period or your due date, understand ovulation timing, and know why the result is a range rather than a single day.ExplainerHow Many Units Are in a Drink?A drink's alcohol content depends on its strength (ABV) and volume. Learn how standard drinks and units are calculated and how to count yours.