BUN Creatinine Ratio Calculator

You can use this BUN creatinine ratio calculator to determine how much blood urea nitrogen you have compared to how much creatinine you have.

Enter the BUN value and Serum Creatinine values to calculate the ratio.

The blood urea nitrogen (BUN) test is a good way to determine if your kidneys or diet are giving you trouble.

BUN/creatinine ratio >20 = Prerenal cause
BUN/creatinine ratio <10 = Intrinsic renal cause

BUN Creatinine Ratio Calculator

You might want to determine your carb cycling or fat burning.


  • Uchino, S., Bellomo, R., & Goldsmith, D. (2012). The meaning of the blood urea nitrogen/creatinine ratio in acute kidney injury. Clinical kidney journal, 5(2), 187-191.
  • Matsue, Y., van der Meer, P., Damman, K., Metra, M., O'Connor, C. M., Ponikowski, P., … & Voors, A. A. (2017). Blood urea nitrogen-to-creatinine ratio in the general population and patients with acute heart failure. Heart, 103(6), 407-413.
  • Schrock, J. W., Glasenapp, M., & Drogell, K. (2012). Elevated blood urea nitrogen/creatinine ratio is associated with poor outcomes in patients with ischemic stroke. Clinical Neurology and Neurosurgery, 114(7), 881-884.
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