Enter your urine albumin and urine creatinine values from the same spot urine lab report into the calculator to estimate the Albumin-to-Creatinine Ratio (ACR). Do not use blood (serum) results.

ACR Calculator

Use values from the same spot urine test. Do not enter blood (serum) albumin/creatinine.

Enter any 2 values to calculate the missing value

Educational use only; not medical advice. Discuss abnormal results with a clinician.

Related Calculators

Albumin to Creatinine Ratio Formula

ACR\,(mg/g)=\left(\frac{UAlb\,(mg/L)}{UCr\,(mg/L)}\right)\times 1000

Units used (common): urine albumin in mg/L or mg/dL, urine creatinine in mg/dL or mmol/L, reported ACR in mg/g (US) or mg/mmol (many countries).
Variables:

  • ACR is the urine albumin-to-creatinine ratio (e.g., mg/g or mg/mmol)
  • UAlb is urine albumin concentration (e.g., mg/L or mg/dL)
  • UCr is urine creatinine concentration (e.g., mg/dL or mmol/L)

To calculate ACR, divide the urine albumin by the urine creatinine from the same spot urine sample, applying any needed unit conversions (for example, converting mg/mg to mg/g by multiplying by 1000).

How to Calculate Albumin to Creatinine Ratio?

The following steps outline how to calculate the Albumin to Creatinine Ratio.

  1. First, determine the urine albumin from the lab report (spot urine sample). 
  2. Next, determine the urine creatinine from the same lab report (spot urine sample). 
  3. Next, gather the formula from above (with the correct units/conversions).
  4. Finally, calculate the Albumin to Creatinine Ratio.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following example values (with units). The expected result is ACR = 50 mg/g.

urine albumin = 50 mg/L

urine creatinine = 100 mg/dL

FAQs about Albumin to Creatinine Ratio

What is the significance of the Albumin to Creatinine Ratio in medical diagnostics?

The Albumin to Creatinine Ratio (ACR) can be a marker used to help detect and monitor kidney disease. An elevated ACR can be a sign of kidney damage, but temporary factors (such as recent strenuous exercise, fever/acute illness, urinary tract infection, dehydration, or menstruation) can also raise results. Clinicians often repeat testing to confirm.

How often should the Albumin to Creatinine Ratio be tested in patients with kidney disease?

For patients with existing kidney disease or those at high risk, healthcare providers might recommend ACR testing at least once a year. However, the frequency can vary based on the patient’s condition, risk factors, and the doctor’s assessment.

Can lifestyle changes impact the Albumin to Creatinine Ratio?

Yes, general health steps such as maintaining a balanced diet, regular physical activity, and good blood pressure/blood sugar control can support kidney health. Some medicines (including NSAIDs and some antibiotics) can affect kidney function in certain people—do not stop prescribed medicines; ask your clinician or pharmacist what is safe for you.

Is the Albumin to Creatinine Ratio test different for children compared to adults?

While the ACR test procedure is the same for both children and adults, the interpretation of results may differ. Children’s normal ACR values can be lower than adults’, and the ranges can vary with age. It’s important for healthcare providers to consider age-specific reference ranges when interpreting ACR results for children.