Historical eGFR Calculator
NIDDK supports the American Society of Nephrology–National Kidney Foundation Task Force's recommendation for calculating estimated glomerular filtration rate (eGFR) using calculators that do not use a race coefficient.1 However, the race-free 2021 Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equations may output slightly different GFR estimates than the 2009 and 2012 race-based CKD-EPI equations. NIDDK is maintaining the 2009 race-based CKD-EPI creatinine calculator for comparison during the transition to the new, recommended equations.
2009 CKD-EPI Creatinine Calculator
The 2009 CKD-EPI creatinine equation uses serum creatinine, age, race, and gender to estimate GFR in adults ages 18 and older.2 The calculator is offered in conventional and SI units.
- The NIDDK’s eGFR calculators rely on creatinine determinations that are isotope dilution mass spectrometry (IDMS) traceable. All laboratories should be using creatinine methods calibrated to be IDMS traceable.
- This calculator should only be used for patients 18 and older.
- All estimating equations estimate GFR. A person’s actual GFR may be higher or lower than the estimate. GFR may be best assessed by monitoring trends over time rather than a single point estimate. Estimating equations become less accurate as GFR increases.
This content is provided as a service of the National Institute of Diabetes and Digestive and Kidney Diseases
(NIDDK), part of the National Institutes of Health. The NIDDK translates and disseminates research findings to increase knowledge and understanding about health and disease among patients, health professionals, and the public. Content produced by the NIDDK is carefully reviewed by NIDDK scientists and other experts.