Bun Creatinine Ratio Calculator
Calculate the BUN to creatinine ratio to help assess kidney function and hydration status. Enter your BUN and creatinine levels to get the ratio and interpretation.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the BUN Creatinine Ratio Calculator
This calculator computes the BUN-to-Creatinine ratio to help assess kidney function and hydration status. All values must be in mg/dL.
- Enter BUN – Input your Blood Urea Nitrogen level (e.g., 20 mg/dL). Use a number ≥ 0.
- Enter Creatinine – Input your serum creatinine level (e.g., 1.0 mg/dL). Must be > 0.
- Click "Calculate" – The ratio (BUN ÷ Creatinine) appears instantly.
- Interpret the result:
- < 10 – Low ratio (possible liver disease or malnutrition)
- 10–20 – Normal range (typical for healthy individuals)
- > 20 – High ratio (possible dehydration or kidney issues)
- Clear – Use the "Clear" button to reset inputs and start over.
Note: The calculator validates inputs automatically. If you see a red error, check that values are non-negative and creatinine is greater than zero.
Previous Results
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Frequently Asked Questions
The BUN to creatinine ratio is a medical measurement used to help evaluate kidney function and hydration status. It is calculated by dividing the blood urea nitrogen (BUN) level by the creatinine level.
A normal ratio is typically between 10:1 and 20:1. Values below 10 may indicate liver disease or malnutrition, while values above 20 may suggest dehydration or kidney issues.
Enter your BUN and creatinine levels in mg/dL, then click Calculate. The tool will compute the ratio and provide an interpretation based on standard ranges.
