Enter the total calcium (mg/dL) and the total creatinine level (mg/dL) into the Calculator. The calculator will evaluate the Ca/Cr Ratio. 

Ca/Cr Ratio Formula

Ca:Cr = Ca/Cr


  • Ca:Cr is the Ca/Cr Ratio ()
  • Ca is the total calcium (mg/dL)
  • Cr is the total creatinine level (mg/dL)

To calculate Ca/Cr Ratio, divide the total calcium by the total creatinine.

How to Calculate Ca/Cr Ratio?

The following steps outline how to calculate the Ca/Cr Ratio.

  1. First, determine the total calcium (mg/dL). 
  2. Next, determine the total creatinine level (mg/dL). 
  3. Next, gather the formula from above = Ca:Cr = Ca/Cr.
  4. Finally, calculate the Ca/Cr Ratio.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total calcium (mg/dL) = 5

total creatinine level (mg/dL) = 6

Frequently Asked Questions (FAQ)

What is the significance of the Ca/Cr Ratio?

The Ca/Cr Ratio is significant as it helps in assessing the balance between calcium and creatinine levels in the body. This ratio can be an indicator of various health conditions, including kidney problems and the body’s calcium handling.

Can the Ca/Cr Ratio indicate specific health issues?

Yes, abnormal Ca/Cr Ratios can suggest certain health issues. A high ratio may indicate conditions such as hyperparathyroidism or other disorders affecting calcium metabolism. Conversely, a low ratio might suggest issues with creatinine clearance or muscle mass loss.

How often should the Ca/Cr Ratio be tested?

The frequency of testing for the Ca/Cr Ratio depends on the individual’s health status and underlying conditions. It’s typically ordered by a healthcare provider when there’s a need to evaluate kidney function or calcium metabolism disorders.

Are there any preparations required before testing for the Ca/Cr Ratio?

No special preparations are usually required before testing for the Ca/Cr Ratio. However, it’s important to follow any specific instructions provided by your healthcare provider, such as fasting or avoiding certain medications before the test.