Urine Output Calculator

For healthy adults, normal urine output generally ranges from 0.5 to 1.5 mL per kilogram of body weight per hour. For pediatric populations, normal ranges are slightly higher, often between 1.0 and 2.0 mL/kg/h. Consistent monitoring helps healthcare providers catch potential acute kidney injuries early.

To find the hourly output for a 70 kg patient over a 6-hour period who produced 630 mL of urine, multiply 70 kg by 6 hours to get 420. Then, divide 630 mL by 420, resulting in an output of 1.5 mL/kg/h, which is considered a safe and normal hydration marker.

The accepted clinical threshold for minimum adequate urine output in adults is 0.5 mL/kg/h. Dropping below this threshold for more than a few consecutive hours may indicate oliguria, prompting further clinical evaluation of renal perfusion, blood pressure, and hydration status.

Urine output is measured using calibrated collection devices such as graduated urinals, bedside commode collection hats, or specialized closed urinary catheter drainage bags with integrated burettes. Accurate documentation requires recording the exact volume and time stamp at the end of each collection interval.