Health Calculators

Water Calculator

This water calculator allows you to calculate how much water is required each day so that you don't have to worry about the amount of water you still need to drink.

Water Intake Calculator

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Table of contents

How does the water calculation work?
Why is water intake so important
What about the water intake of children and teenagers?
What if it is too little, too much?
What you need to know about dehydration
Children’s symptoms
Risk factors

How does the water calculation work?

This tool can help you determine how much water is actually needed, as it considers many factors.
There are many contradictions surrounding the subject of water, and everyone seems to have a different opinion.
The best advice is to listen and follow your body. But, it's also important to have some guidelines so that you can accurately reflect your own state.
The water calculator, for example, asks you to input your weight in English, metric, and level of activity. You have the option to choose between Sedentary or Moderately and Active levels of activity.
When you press calculate, you will see the amount of water that you need in various sizes. Make sure it includes the units you are most comfortable with.

Why is water intake so important

Water is essential for your body to function well. Each person should calculate how much water they need each day based on their lifestyle and weight.
Hydrating your daily water needs will prevent you from becoming dehydrated. It will also increase your performance and lead you to a healthier body.
The total fluid intake is water, other drinks drank, and water from foods consumed. According to the Institute of Medicine, approximately 80 percent of water consumed each day is made up of water and beverages. About 20 percent of water comes from food.
Knowing your daily water consumption you can also calculate your hourly water needs by subtracting the amount you consume from the time you're awake. An active 150-pound person should drink 8 ounces of water an hour, even if they sleep 8 hours each night.

What about the water intake of children and teenagers?

The water calculator can calculate how much water a person should drink. This is a very important topic as proper hydration is essential for proper development, good concentration, and healthy weight.
It is crucial to keep track of how much fluid a child is drinking. A toddler may not always request water and by the time that he realizes that he needs it, he could already be mildly dehydrated.
The amount of fluids that a child consumes each day depends on his or her age, gender, body weight, activity level, overall health, and other factors.

What if it is too little, too much?

If you don't know what your body needs, you might end up on the wrong side. It is possible to drink too little water and become dehydrated, leading to symptoms such as fatigue, headaches, or heartburn.
You could also have too much water and run the risk that you will develop hyponatremia. This is a condition whereby cells rupture in different parts of your body, causing symptoms like vomiting and headaches.

What you need to know about dehydration

When the body loses more water or fluids than it receives, dehydration is what you see. Even low levels of dehydration may cause headaches, lethargy, constipation, and other symptoms.
The human body is about 75 percent water. Without water, the body cannot survive. Water is found within cells, in blood vessels, and between cells.
Water management systems that are sophisticated keep our water levels stable and alert us to the need for fluids.
We can replenish water by drinking fluids, even though water is constantly being lost during the day due to sweating, urinating, and breathing. Dehydration can also be managed by the body, which can move water around to where it is most needed.
Most cases of severe dehydration are easily reversed with increased fluid intake.


Although it is simple to treat, dehydration can prove fatal if left untreated.
The first signs of dehydration are thirst, dark urine, and reduced urine production. Actually, urine color is one of many indicators of a person's level of hydration. Clear urine means that you are well hydrated while dark urine means that you are severely dehydrated.
But, it's important to keep in mind that even though dehydration is more common in older people, it can also occur without the need for water. Drinking more water in hot weather or when you are ill is important.
The condition can lead to mild to severe dehydration.
  • Dry mouth
  • lethargy
  • Symptoms of weakness in the muscles
  • headache
  • dizziness
  • Severe dehydration (loss of 10-15% of the body's water) can be accompanied by extreme versions.
  • Insufficient sweating
  • sunken eyes
  • Dry and shriveled skin
  • low blood pressure
  • Increased heart rate
  • fever
  • delirium
  • unconsciousness
  • Children’s symptoms

  • Baby's sunken fontanel (soft spot at the top)
  • Dry tongue and mouth
  • irritable
  • There are no tears from crying
  • Sunken cheeks and/or eyes
  • No wet diapers longer than 3 hours
  • Causes

    Dehydration is caused by a lack of water intake, excessive water loss, or both.
    Sometimes it is impossible to drink enough fluids. This could be due to our busy schedules, inability to drink, or because we are camping or hiking in areas without water. Dehydration can also be caused by:
    Diarrhea - Is the most common cause of dehydration and death. Diarrhea is a condition in which the large intestine absorbs water. Dehydration is caused when the body excretes too many calories.
    Drinking - Causes fluid loss, making it difficult for water to be replaced by drinking.
    Sweating - It is when the body's cooling mechanisms release a substantial amount of water. Additional fluid loss can occur from sweating in hot and humid environments and during vigorous exercise. A fever can lead to increased sweating and dehydration. This is especially true if the patient also has vomiting or diarrhea.
    Diabetes - High blood sugar levels lead to increased urine and fluid loss. 
    Frequent urination - usually caused by uncontrolled diabetes can also be caused by alcohol or medications like antihistamines blood pressure medications and antipsychotics.
    Burns - Blood vessels can become damaged and fluid can leak into surrounding tissues.

    Risk factors

    Dehydration can occur to anyone. However, certain people are more vulnerable. Those at most risk include:
    It is common for older adults to become dehydrated.
  • People who live at higher elevations.
  • Endurance athletes, particularly those competing in marathons, triathlons, and cycling events, are at risk. This article will explain how dehydration can impact performance in sports.
  • People suffering from chronic diseases such as diabetes, kidney disease, or alcoholism.
  • Children and infants are most often affected by diarrhea and vomiting.
  • Senior adults are more likely to become dehydrated. There are also brain changes that can make it less likely that you will feel thirsty.


    If dehydration does not get treated, it can lead directly to serious complications.
    Low blood volumes - A decrease in blood volume can cause a drop in blood pressure and a reduction of oxygen reaching the tissues. This can be dangerous.
    Seizures due to an insufficient amount of electrolytes.
    Kidney problems - including kidney stones, Urinary tract infections can lead to kidney failure.
    Heat injury - This could include mild cramps, heat exhaustion, or heat stroke.


    To diagnose dehydration, a doctor may use both mental and physical examinations. A person with symptoms such as disorientation and low blood pressure, fast heartbeat, fever, sweat loss, and inelastic complexion will be diagnosed as dehydrated.
    Many blood tests are used to check the levels of sodium, potassium, and other electrolytes. Electrolytes are chemicals that regulate the body's hydration and are vital for nerve and muscular function. To diagnose dehydration, a urine analysis can provide valuable information. A dehydrated person's urine will appear darker and more concentrated, containing a certain number of compounds known as ketones.
    Doctors often look for a sunken, soft spot on the head to diagnose infantile dehydration. They might also examine for muscle tone and loss of sweat.


    The body needs to replenish fluids in order to combat dehydration. Clear fluids like water, broths, frozen water, ice pops, and sports drinks such as Gatorade can be used to replenish the body's fluid levels. For some, intravenous fluids may be required to rehydrate. People with severe dehydration should not drink caffeine, such as espresso, coffee, or sodas.
    It is important to treat the underlying causes of dehydration with appropriate medication. You can buy over-the-counter or online medications such as antidiarrhea medicine, stop vomiting medication, and anti-fever medication.
    Parmis Kazemi
    Article author
    Parmis Kazemi
    Parmis is a content creator who has a passion for writing and creating new things. She is also highly interested in tech and enjoys learning new things.
    Water Calculator English
    Published: Mon May 16 2022
    In category Health calculators
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