Daily Water Intake: Your Questions Answered
These are the questions people ask most often about daily water intake. Each answer is short; follow the links for the full detail.
What does a daily water intake calculation tell me?
A rough guide to daily fluid needs in Singapore's hot, humid climate.
What is the formula?
About 33 ml per kg of body weight plus 350 ml per 30 minutes of exercise.
What do I need to enter?
Weight (kg), Exercise minutes a day.
Is this a medical assessment?
No. These are general estimates. Speak to a doctor or polyclinic for advice about your health.
Can you show an example?
For example, with these inputs:
- Weight (kg): 65
- Exercise minutes a day: 30
the calculator returns:
- Suggested water intake: 2.50 litres
Any tips?
- Asian BMI cut-offs are lower than WHO's, so a 'normal' international BMI can still mean moderate risk.
- Measure at the same time of day, ideally in the morning, for consistent readings.
- Singapore's heat and humidity raise fluid needs, especially when exercising outdoors.
Background
Research has shown that Asians tend to develop conditions such as type 2 diabetes and heart disease at lower body weights than Europeans. That is why the Health Promotion Board recommends lower BMI cut-offs for Singaporeans, with 23 marking the start of moderate risk.
Energy needs depend on age, sex, size and activity. Formulas such as Mifflin-St Jeor estimate resting needs, and an activity multiplier turns that into daily needs. Real requirements vary by a few hundred calories, so adjust based on how your weight changes over several weeks.
Simple measurements such as weight, height and waist circumference are widely used to screen for health risks because they are cheap and easy to repeat. They are not diagnoses, but tracked over time they show whether lifestyle changes are working.
Related calculations
- Calories Burned Calculator: Estimates calories burned with MET values.
- BMI Calculator (Asian Cut-offs): Singapore's Health Promotion Board uses lower BMI cut-offs for Asians because health risks rise at lower BMIs.
- BMI Calculator (WHO): Calculates BMI with the international WHO categories.
- BMR Calculator: Estimates calories your body burns at rest.
Try it yourself with the Daily Water Intake Calculator.
Run your own numbers: Daily Water Intake Calculator