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Urine Output Calculator

Enter the required values in the Urine Output Calculator to determine the urine output rate and fluid balance.

Weight:

kg ▾

Time (sec):

sec ▾

Fluid Intake:

ml ▾

Urine Volume:

ml ▾

Fluid Balance Unit:

Urine Output Rate Unit:

Related

The urine output calculator evaluates normal urination based on hourly and daily urine output.

What is the Normal Urine Output Per Hour?

A healthy person typically urinates between 800–2000 mL per day. The average urine output per hour ranges from 33.3 to 83.3 mL. Intake and output may vary depending on the individual.

The urine output calculator helps determine whether your urine output is within the normal range. If your results fall outside this range, it may indicate an underlying issue.

Why Calculate Net Urine Output?

Calculating urine output is essential to assess a person’s physical condition. This calculator indicates whether urine output is within a healthy range.

Ensure that you consume at least 2 liters of fluid per day. Requirements may vary based on age, activity, and health conditions.

Composition of Urine

Normal urine is composed of:

Water
Potassium
Sodium
Creatinine and urea

Normal urine does not contain viruses, bacteria, or fungi, and its color typically ranges from pale yellow to deep amber.

Urine Output Formula

The normal urine output in mL/kg/hr can be calculated using the formula:

Urine output (mL/kg/hr) = Collected urine / (Weight × Time)

Where:

Weight: Kilograms (kg)
Collected Urine: Milliliters (mL)
Time: Hours (hr)

Example Calculation

Consider a patient with 3000 mL urine collected over 24 hours and weighing 80 kg.

Collected urine = 3000 mL
Weight = 80 kg
Time = 24 hours

Solution:

Urine output (mL/kg/hr) = 3000 / (80 × 24) = 3000 / 1920 = 1.56 mL/kg/hr

This indicates the patient’s urine output per hour. The calculator helps monitor urination volume and overall fluid balance.

Normal Urine Characteristics Table

The table below summarizes normal urine output and characteristics:

Characteristic	Normal Values
Color	Pale yellow to deep amber
Odor	Odorless
Volume	750–2000 mL/24 hour
pH	4.5–8.0
Specific gravity	1.003–1.032
Osmolarity	40–1350 mOsmol/kg
Urobilinogen	0.2–1.0 mg/100 mL
White blood cells	0–2 HPF (per high-power field)
Leukocyte esterase	None
Protein	None or trace
Bilirubin	<0.3 mg/100 mL
Ketones	None
Nitrites	None
Blood	None
Glucose	None

Working of Urine Output Calculator

Calculate urine output using the online tool by following these steps:

Input:

Enter body weight, time, and urine volume
Enter fluid intake, urine rate, and fluid balance unit
Tap "Calculate"

Output:

Urine output rate
Fluid balance

FAQs

What is Net Fluid Balance Calculation?

Fluid balance measures a patient’s fluid input and output to calculate the net difference or balance. Depending on the patient’s fluid status, a 24-hour goal for fluid balance is set.

Fluid balance = Fluid intake - Collected urine

What is Oliguria?

Oliguria is a medical term for low urine output. In adults, this refers to less than 400–500 mL (approximately two cups) of urine in 24 hours.

References

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