Urine Output Calculator (ml/kg/hr)

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Switches the oliguria and polyuria thresholds: adults use 0.5 ml/kg/hr, children use 1.0 ml/kg/hr. KDIGO AKI staging uses 0.5 and 0.3 ml/kg/hr at every age.
Use actual body weight (not ideal body weight) for standard urine output calculations.
kg
Total volume collected during the measurement period, typically from a urinary catheter bag.
mL
Duration of the urine collection window. Common intervals: 1 hr, 4 hr, 8 hr, 12 hr, 24 hr.
hr
Total fluids given (IV, oral, NG feeds) during the same period. Leave at 0 to skip fluid balance.
mL
Duration is required to stage KDIGO AKI using urine output alone.
Urine output rateOliguria
0.43ml/kg/hr

Urine volume divided by weight times hours

Hourly urine volume30mL/hr
Projected 24-hour output720mL
KDIGO AKI stage (urine output)Oliguria - duration needed to stage
0.43 ml/kg/hr
Severe oliguria<0.3Oliguria0.3-0.5Low-normal0.5-1Normal1-3High-normal3-5Polyuria5+

Urine output is 0.43 ml/kg/hr - in the oliguric range.

  • Oliguria threshold for adult patients is 0.5 ml/kg/hr.
  • Check for hypovolemia, cardiac output changes, or obstructive causes before labeling as AKI.
  • At this rate, the projected 24-hour output is 720 mL (10.3 mL/kg/day).

Next stepEscalate to the clinical team if oliguria persists beyond 6 hours. Assess volume status, medications, and creatinine trend.

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