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Urine Output Calculator

Calculate weight-based urine output over time to assess hydration and renal perfusion.

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Formula

mL / kg / hr

Standardizes urine volume by patient weight and observation time to identify oliguria.

Worked Example

500 mL over 8 hours in a 70kg patient -> 0.89 mL/kg/hr.

Frequently Asked Questions

What is a normal urine output?

In adults, a normal output is generally > 0.5 mL/kg/hr. For children, it is typically > 1.0 mL/kg/hr.

What is oliguria?

Oliguria is defined as urine output less than 0.5 mL/kg/hr in adults for more than 6 hours.

Why use mL/kg/hr instead of total volume?

Weight-based calculation allows for a consistent standard across different body sizes, insuring a 50kg person and a 100kg person are both evaluated fairly.

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