Enter the total urine output and the number of hours into the calculator to determine the hourly urine output.

Hourly Urine Output Calculator

Enter any 2 of the 3 fields below to calculate the missing value. (Optional) Add body weight to also calculate mL/kg/hr.

mL/kg/hr

Medical note: This calculator is for informational purposes only and does not diagnose or treat any condition. Urine output interpretation depends on factors like age, body size, medications, and overall health. If you have very low or no urine output, signs of severe dehydration, confusion, chest pain, shortness of breath, severe weakness, or swelling, seek urgent medical care or contact a clinician promptly.

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Hourly Urine Output Formula

The following formula is used to calculate the hourly urine output for a given total urine output and number of hours. 

U = T / H

Variables:

  • U is the hourly urine output (ml/hour)
  • T is the total urine output (ml)
  • H is the number of hours

To calculate the hourly urine output, divide the total urine output by the number of hours. In some settings, urine output is also tracked as mL/kg/hr (normalized to body weight).

What is Hourly Urine Output?

Hourly urine output is a measure of the volume of urine produced by the kidneys per hour. It is an important parameter used in clinical monitoring of kidney function and fluid balance. It is typically measured in milliliters per hour (ml/hour).

How to Calculate Hourly Urine Output?

The following steps outline how to calculate the Hourly Urine Output.

  1. First, determine the total urine output (T) in milliliters.
  2. Next, determine the number of hours (H) over which the urine was collected.
  3. Finally, calculate the hourly urine output using the formula U = T / H.
  4. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Total urine output (T) = 1200 ml

Number of hours (H) = 6 hours

Hourly urine output (U) = 1200 / 6 = 200 mL/hour (0.2 L/hour)