kg
minutes
Water per day2.8 litres
About 11 glasses of 250 ml
From body weight2,450 ml
From exercise360 ml
From climate0 ml
Per waking hour176 ml
● calculated in 0.00 msruns in your browserupdated 07:35:35
Visualise
Where your water need comes from
Breakdown
Table
The maths
Formula
This is the exact calculation the tool runs.
Water (ml) = 35 × kg + 12 × exercise minutes + 500 if hot
35 mlper kg of body weight
12 mlper minute of exercise
250 mlone glass
Practice
Worked examples
Click "Try it" to load an example into the tool.
Office worker
Body weight: 65 kgExercise per day: 0 minutesClimate: Normal or cool
2.3 litres
Runner
Body weight: 72 kgExercise per day: 60 minutesClimate: Normal or cool
3.2 litres
Summer in Karachi
Body weight: 80 kgExercise per day: 30 minutesClimate: Hot or humid
3.7 litres
Step by step
How to use the Water Intake Calculator
Enter your weight
Bigger bodies need more water.
Add exercise minutes
You lose water when you sweat.
Choose your climate
Hot weather adds about half a litre.
Questions
Frequently asked questions
Does tea or coffee count?
Yes, most drinks count, and so does water in food like fruit and soup.
Can I drink too much water?
Yes, very large amounts in a short time can be dangerous. Spread your water through the day.
How do I know I am drinking enough?
Pale yellow urine is a good sign. Dark urine means you need more.