Urine Output Calculator (mL/kg/hr)
Health & FitnessCalculate urine output per kilogram per hour, used to help identify oliguria.
Urine Output Rate
Urine output rate. Educational reference only, not a substitute for clinical judgment.
Interpretation
General interpretation. Oliguria threshold is 0.5 mL/kg/hr for adults and 1 mL/kg/hr for children. At or above the typical threshold for adequate urine output
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Odeh Ahwal0people find this calculator helpful
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Frequently Asked Questions
What is urine output per kg per hour used for?
It is a key marker of kidney function and fluid status, closely monitored in hospitalized and critically ill patients to detect early signs of acute kidney injury or inadequate fluid resuscitation.
What counts as oliguria?
Oliguria, or abnormally low urine output, is generally defined as under 0.5 mL/kg/hr in adults sustained over several hours, or under 1 mL/kg/hr in children.
Why does the calculation need weight and time?
Urine output naturally varies with body size and how long urine has been collected, so dividing total collected urine by both weight and time gives a standardized rate that can be compared against established thresholds.
Is this calculator a substitute for medical advice?
No. This is an educational reference implementation of the standard urine output rate formula, not a substitute for a physicians clinical assessment.
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