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Urine Output Per Kg Calculator

Work out urine output per kg instantly with clear inputs, formula shown and shareable results.

About Urine Output Per Kg Calculator

Divides measured urine volume by weight and collection hours to give the mL/kg/h figure used in the KDIGO acute kidney injury criteria.

Formula

Weight-indexed urine output

Rate = volume (mL) / (weight kg x hours); KDIGO oliguria thresholds are 0.5 mL/kg/h for 6 h and 0.3 mL/kg/h for 24 h

Worked example

With the default values below, Urine Output Per Kg Calculator returns Urine output of 0.714. Change any input above and every figure here is recalculated in your browser.

Inputs used

Urine volume collectedaccepts 0–10,000 mL
1,200 mL
Body weightaccepts 1–250 kg
70 kg
Collection periodaccepts 1–72 h
24 h

Results

Urine output
0.714 mL/kg/h
KDIGO check
At or above 0.5 mL/kg/h
Projected 24-hour volume
1,200 mL

Step by step

  1. 1Values used
  2. 2Weight-indexed urine output
  3. 3Urine output= 0.714 mL/kg/h
  4. 4KDIGO check= At or above 0.5 mL/kg/h
  5. 5Projected 24-hour volume= 1,200 mL

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or fees or charges into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

What counts as oliguria?

Less than 0.5 mL/kg/h sustained for at least six hours meets KDIGO stage 1 by urine output.

Is anuria different?

Yes. Anuria means under 100 mL in 24 hours and is a more severe finding.

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