Daily Water Needs Calculator (Millilitres and Cups)
Uses your body weight, exercise minutes and the heat of the day to estimate how much water you should drink, in millilitres and cups.
Recent
Formula
How the calculation works
The tool multiplies your body weight in kilograms by 33 millilitres, the base amount most adults need.
It adds 12 millilitres for every minute of exercise and a further amount when the day is hot or very hot.
It divides the total by 240, the size of a standard cup, to return the same need in cups.
Common mistakes
- Drinking the whole daily amount at once, when the body absorbs water far better in small sips through the day.
- Counting tea, coffee and soft drinks as plain water, since many of them act as diuretics and add sugar.
When to use it
- Plan how much water to carry for a long outdoor day when the temperature is high.
- Check whether your usual daily drinking actually matches your weight and activity level.
Worked example
A 70 kg person exercising 30 minutes on a hot day needs 70 times 33 plus 360 plus 300, which is 2970 millilitres or about 12.4 cups.
Common questions
Does tea or coffee count towards the daily water need?
Partly, but it is safer to count them at half value and drink plain water as well, since tea and coffee increase urine output.
Related tools
-
Child Growth Calculator for Height and Weight
Shows the expected height and weight range for a child at a given age and checks whether the current measurements fall inside that normal range.
-
Family Monthly Budget Planner
Split a monthly income into food, housing, education, health and savings so each category shows a clear taka amount.
-
Medicine Dose Calculator for Children
Calculates a child's total daily dose in milligrams from body weight and the dose per kilogram, then splits it into the amount for each administration.
-
Wedding Budget Calculator in Taka
Adds venue, food, clothing and other costs to give the total wedding budget in Taka and the average cost per guest.
-
Calorie Deficit Calculator
Work out your daily calorie deficit, the weight loss it predicts and how many days a week you will hold that deficit.
-
Heart Rate Zone Calculator
Work out your maximum heart rate and the beats-per-minute range of your training zone from your age and the intensity band you choose.
-
Lean Body Mass Calculator
Find your lean body mass, the fat mass you carry and the weight you would need for a goal body fat percentage.
-
Ovulation and Fertile Window Calculator
Estimates your ovulation day and fertile window from the first day of your last period, your cycle length and your luteal phase.