MDRD GFR Calculator

Estimate eGFR using the 4-variable MDRD equation (race-free). Output classified by KDIGO CKD stage.

For educational and clinical reference. Not a substitute for medical judgment. See the medical disclaimer.
eGFR (MDRD)
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KDIGO Stage
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References

  1. Levey AS, Bosch JP, Lewis JB, et al. A more accurate method to estimate glomerular filtration rate from serum creatinine. Ann Intern Med. 1999;130(6):461-470.
  2. Delgado C, Baweja M, Crews DC, et al. A Unifying Approach for GFR Estimation. Am J Kidney Dis. 2022;79(2):268-288.

How to use

  1. Enter age, serum creatinine, and sex.
  2. eGFR and KDIGO stage update instantly.
  3. Use the copy button to copy results.

Frequently asked questions

What is the MDRD equation?

The 4-variable Modification of Diet in Renal Disease (MDRD) Study equation: eGFR = 175 × Cr^−1.154 × Age^−0.203 × (0.742 if female). Race-free version.

Why use MDRD vs CKD-EPI?

MDRD was the standard from 1999–2009. CKD-EPI (2009/2021) is more accurate at eGFR > 60 mL/min/1.73 m² and is now preferred for routine reporting.

Is the race coefficient included?

No. This calculator uses the race-free version of MDRD, in line with the 2021 NKF-ASN Task Force recommendation.

What units does this use?

Creatinine in mg/dL, age in years. Output in mL/min/1.73 m².

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