Enter the total BUN (mg/dL) and the plasma Creatinine (mg/dL) into the Bun Creatinine Ratio Calculator. The calculator will evaluate and display the Bun Creatinine Ratio. 

Bun Creatinine Ratio Formula

The following formula is used to calculate the Bun Creatinine Ratio. 

  • Where BCR is the Bun Creatinine Ratio ( )
  • TB is the total BUN (mg/dL) 
  • PC is the plasma Creatinine (mg/dL) 

To calculate the the bun creatinine ratio, divide the total BUN by the total plasma creatinine.

How to Calculate Bun Creatinine Ratio?

The following example problems outline how to calculate Bun Creatinine Ratio.

Example Problem #1:

  1. First, determine the total BUN (mg/dL).
    • The total BUN (mg/dL) is given as: 125.
  2. Next, determine the plasma Creatinine (mg/dL).
    • The plasma Creatinine (mg/dL) is provided as: 5.
  3. Finally, calculate the Bun Creatinine Ratio using the equation above: 


The values given above are inserted into the equation below and the solution is calculated:

BCR = 125 / 5 = 5 ( )

Example Problem #2: 

For this problem, the variables required are provided below:

total BUN (mg/dL) = 160

plasma creatine (mg/dL) = 7

Test your knowledge using the equation and check your answer with the calculator above.

BCR = TB / PC = ?