AdBlocker Detected
adblocker detected
Calculatored depends on revenue from ads impressions to survive. If you find calculatored valuable, please consider disabling your ad blocker or pausing adblock for calculatored.

Urine Output Calculator


Table of Content


This Urine output calculator helps healthcare professionals in estimating and monitoring the urine output of their patients. This tool considers factors like fluid balance and urine output in ml/ kg/ hr which is useful for assessing kidney function and overall hydration status. 

How does our urine output calculator work?

Enter your patient's details such as body weight, time of urine collection, urine volume, and fluid intake values.

Press the Calculate button

The urine output calculator will show you the results for urine output rate and fluid balance along with the step-by-step solution.

How to calculate urine output rate in ml/kg/hr?

To calculate urine output, follow the instructions below:

At first, collect your patient’s information, such as:

  • Patient's body weight
  • The time for which the urine was collected
  • Volume of the urine over the given period

Let’s assume we have the following data for a patient:

  • Collected urine: 2000 mL
  • Weight: 70 kg
  • Time: 8 hours

Now, calculate the net urine output by using the urine output formula, which is:


Urine output (ml/kg/hr) = Total collected urine (mL) / (Body weight (kg) × Time (hours))


Now, add these values to the equation:

  • Urine output (ml/kg/hr) = 2000 / (70 × 8)
  • Urine output (ml/kg/hr) = 2000 / 560
  • Urine output (ml/kg/hr) ≈ 3.57 ml/kg/hr

So, for this example, the urine output rate is approximately 3.57 ml/kg/hr.

Fluid balance:

Fluid balance involves maintaining equilibrium between the intake and output of fluids in the body which ensures optimal hydration levels.


Proper fluid balance is crucial for overall health that prevents you from both dehydration and overhydration.

Fluid balance formula:

The formula to calculate fluid balance is as follows:

Fluid balance = Fluid intake - Collected urine

All the values are in milliliters (mL).

What is the normal and healthy urine output (ml/hour)?

Have a look at the chart below to get a clear idea of urine output rates.

Age Group Urine Output (ml/kg/h) Meaning
Adults (≥18 years old) < 0.5 Oliguria (Seek medical attention immediately)
0.5 - 5 Healthy person
> 5 Polyuria (Consult a doctor if excessive or persistent)
Children (<18 years old) < 1 Oliguria (Seek medical attention immediately)
1 - 3 Healthy person
> 3 Polyuria (Consult a doctor if excessive or persistent)

What is the normal urine output per day?

The normal urine output per day can vary depending on several factors but generally falls within a range of 800 - 2,000 milliliters (mL) for adults with a normal fluid intake of around 2 liters per day.

Frequency of urination in a day:

The frequency of urination in a day can vary widely among individuals and is influenced by factors such as hydration, age, and overall health. On average most people (adults) with normal fluid intake and bladder function urinate about 6 to 7 times in 24 hours.

Kidney Failure And Decreased Urine Output:

Kidney failure also known as renal failure, is a condition where the kidneys are unable to filter out waste and toxins from the blood properly. This can lead to a variety of complications, and reduced urine output is a common symptom of kidney failure.

Legal notice and disclaimer:

All the information given in this urine output calculator is provided for education purposes only, and should not replace professional medical advice, diagnosis, or treatment. Consult with a qualified healthcare professional for any health-related concerns. 

Do not make decisions solely based on the information provided by the urine output Calculator. Reliance on its results is at your own risk. The creators of this tool do not assume liability for errors or consequences arising from its use.

Alan Walker

Studies mathematics sciences, and Technology. Tech geek and a content writer. Wikipedia addict who wants to know everything. Loves traveling, nature, reading. Math and Technology have done their part, and now it's the time for us to get benefits.

Submit Your Review