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Normal Urine Output Calculator for Kidney Function and Fluid Balance Monitoring

Normal Urine Output Calculator
Weight Gain Calculator

Urine output: mL/kg/hr

Fluid balance: mL

Oliguria diagnosis values:
- In adults: urine output <500mL/24 h, <0.5 mL/kg/hr
- In children: <1000mL/24 h, <1 mL/kg/hr

The urine output calculator helps determine the amount of urine per kg of a person’s weight. Based on the fluid intake, the urine output is estimated to determine the fluid balance. Since the fluid intake is different in adults and kids, the urine output will also be different, making the urine output calculator vital for the patients.

How to use a Urine Output Calculator?

To calculate the urine output rate, you have to enter a few perimeters, after which the urine output calculator will provide rapid, fast results.

  • Enter your weight.
  • Enter total urine output, the volume of urine collected over a specified time.
  • Time period in which the urine is collected.
  • The fluid intake over the specific time period.
  • Press calculate.

The results will determine if your urination amount during the cycle of 24 hours is normal or not. Considering the 2 L of fluid intake during 24 hours, the total urine output in a healthy adult ranges between 800 to 2000 mL.

The calculator will estimate the results by using the given formulas:

  • Urine output in mL/kg/hr = Total urine output in mL / (Weight in kg x Hours)
  • Fluid balance in mL = Fluid intake in mL – Total urine output in mL.

Interpretation of Urine Output ValuesInterpretation of Urine Output Values

The values calculated by the urine output calculator tell much about an individual’s health status. For the patients, these values also help understand the concentration of certain chemicals such as sodium, nitrogen, potassium, urea, uric acid, and creatinine.

The chart below will help you understand the urine output in adults and kids.

AgeUrine output
ChildrenBetween 1 and 3
AdultsBetween 0.5 and 5

However, the normal urine output value can differ based on activity level, health status, age, or fluid intake. On average, humans urinate 6 to 7 times in a cycle of 24 hours. The frequency of urination depends upon:

  • Any health condition such as diabetes
  • Age of the individual
  • The amount of fluid intake
  • The type of intake fluid, e.g., alcohol, caffeine, etc.
  • Certain medications
  • Size of bladder

How Does Urine Output Affect the Individual’s Health?How Does Urine Output Affect the Individual’s Healt

Several factors might change the urinary output, and any increased and decreased value can significantly affect the health of any individual. Any obstruction in the urinary tract affects the urination rate and could be a sign of a health condition associated with the kidneys. Keeping an eye on your urinary output by using a urine output calculator helps track the performance and health of the kidneys.


Oliguria is the low urinary output that may result from dehydration, as a result of which the body produces less urine. The urine output of less than 400 ml of urine in 24 hours is the indicator of Oliguria. The kidneys do not produce enough urine during this condition to preserve the body’s liquids.

Any physical blockage such as kidney stones, abnormal structure of the urinary tract, blood clots in the tract, damage to the bladder, cancerous tumors, and severe dehydration are the major triggering factors causing Oliguria. A few medications, such as aminoglycoside antibiotics, nonsteroidal anti-inflammatory drugs, etc., may also lead to causing kidney injuries.


Polyuria is the opposite of Oliguria, in which the urine output is excessively high and exceeds the output value of 2.5 L daily. Nocturnal Polyuria is when an individual feels the symptoms of Polyuria at night, such as peeing more often during bedtime.

Polyuria is caused due to certain conditions, including diabetes, bladder infection, kidney failure, anemia, interstitial nephritis, enlarged prostate size, or certain types of cancer. Drinking alcohol or caffeine may also lead to Polyuria, and the prolonged use of certain medications, such as diuretics, may also increase urine volume.

The flowing chart will explain how different urinary output values are normal or indicate polyuria and oliguria.

Urinary output (in adults)Urinary output (in children under 18)Interpretation
Between 0.5 and 5Between 1 and 3Normal
Lesser than 0.5Leser than 1Oliguria
Greater than 5Greater than 3Polyuria

How is Kidney Failure Linked to Urine Output?


Oliguria or decreased urinary output indicates a high chance of kidney failure. The kidney’s primary function is to filter out toxins from the body through urination, but when the toxins are not completely removed from the body, it means that the kidney has lost its ability to filter them. Some toxins stay in the bladder, and once the amount of toxins increases in the blood, the kidney does not work properly, leading to kidney failure.

The urine flow rate calculator produces different results for kids and adults, making it easier to identify if the urine output is decreasing seriously.


The urine output calculator gives a precise urine output rate that can be used to assess kidney health. The kidney is the only organ in the body that produces urine. The urine output rate can be increased or decreased to assess various kidney disorders. Certain conditions are associated with the increased or decreased urination rate and can be controlled by regularly checking the urine output rate.

Frequently Asked Questions (FAQs)

How many mL per hour is normal urine output?

The normal urine output in children is 1.5 mL/kg/hour, while in adults, it is between 0.5 and 5 mL/kg/hour.

What is the excessive urine output?

A urine output above 2.5 liters is considered excessive, but it may also result from excessive fluid intake.

Which factors contribute to causing kidney failures?

Kidney trauma, severe dehydration, exposure to toxic substances, and prolonged medication use contribute to kidney failure in most individuals.

What is Polyuria and Oliguria?

Polyuria is when the urine output is increased to an abnormal extent, while Oliguria is associated with lower urine output. The increased or decreased values in any of these conditions are not directly linked to fluid intake.

Which factors contribute to affecting urinary output?

Urinary output is affected by certain factors, including caffeine or alcohol consumption, medication, dehydration, or any chronic kidney disease.

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