BUN/Creatinine Ratio Calculator

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BUN measures only the nitrogen in urea. Many labs outside the U.S. report urea in mmol/L instead, which is a larger number. Pick what your report shows.
From a basic or comprehensive metabolic panel. Typical adult BUN is about 7-20 mg/dL (urea 2.5-7.1 mmol/L).
mg/dL
Conventional U.S. labs use mg/dL; most other countries use umol/L. The tool converts either way.
Also on a metabolic panel. Typical adult range is about 0.6-1.3 mg/dL (53-115 umol/L).
mg/dL
BUN/creatinine ratioNormal range (~10-20)
14
CategoryNormal
BUN (converted)14mg/dL
Creatinine (converted)1mg/dL
14
Low<10Normal10-20High20+

Your BUN/creatinine ratio is about 14, in the normal band.

  • A ratio of roughly 10 to 20 is the usual balance between urea nitrogen and creatinine.
  • Normal does not rule out kidney issues on its own. The individual BUN and creatinine values and your eGFR still matter.

Next stepShare the full panel (BUN, creatinine, and eGFR) with your clinician for interpretation.

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