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BUN-to-Creatinine Ratio Calculator — result sheet
Calculate the BUN-to-creatinine ratio in conventional or SI laboratory units and show the normalized values used in the comparison.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Conventional ratio = BUN (mg/dL) ÷ creatinine (mg/dL). For SI entries, convert urea mmol/L to BUN mg/dL by ×2.801 and creatinine µmol/L to mg/dL by ÷88.4 before dividing.
This calculator separates the arithmetic ratio from interpretation. It accepts the two common reporting conventions, normalizes SI inputs transparently, and does not infer kidney function, dehydration, bleeding, or a diagnosis from the ratio alone.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Laboratory unit system — 2 choices
- BUN or urea value — selected units; minimum 0.01; maximum 500
- Creatinine value — selected units; minimum 0.01; maximum 2000
Worked example
| Input | Value |
|---|---|
| Laboratory unit system | conventional |
| BUN or urea value | 14 |
| Creatinine value | 1 |
BUN/creatinine ratio = 14 ÷ 1 = 14.
Assumptions and limits
- Conventional inputs are BUN in mg/dL and creatinine in mg/dL.
- SI inputs are urea in mmol/L and creatinine in µmol/L.
- The SI conversion uses 1 mmol/L urea nitrogen equivalent to 2.801 mg/dL BUN and 88.4 µmol/L creatinine per 1 mg/dL.
- Creatinine must be greater than zero because it is the denominator.
- The ratio is dimensionless after both values are expressed on the same conventional mass basis.
- BUN and urea are related laboratory measures but are not interchangeable without the stated conversion.
- The ratio is affected by diet, catabolism, bleeding, liver function, muscle mass, medications, hydration, and kidney physiology.
- The calculator does not estimate GFR or choose a drug dose.
- Clinical interpretation requires the original laboratory report, trends, symptoms, and professional judgment.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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