eGFR Calculator — CKD-EPI 2021 (Race-Free)
The CKD-EPI 2021 equation estimates glomerular filtration rate from serum creatinine, age, and sex. It is the National Kidney Foundation and American Society of Nephrology recommended equation as of 2021, and replaced earlier equations that included a race coefficient. The race-free formulation is widely adopted across United States health systems and most international laboratories. eGFR is reported in mL/min/1.73 m² and is used for chronic kidney disease staging, transplant referral, and many drug-dosing decisions, although Cockcroft-Gault remains the formula many FDA labels reference for renal-dose adjustment.
This tool is for educational and decision-support use only. It does not replace independent clinical judgement. Always verify against the current guideline, FDA label, or specialty reference cited below before acting. Do not enter patient identifiers (name, MRN, dates of service).
Tool
Who this is for
- Internal medicine and nephrology trainees
- Hospitalists evaluating renal function trends
- APPs managing chronic kidney disease
How to interpret the result
| Score / band | Interpretation |
|---|---|
| ≥ 90 | G1 — normal or high (interpret with albuminuria). |
| 60–89 | G2 — mildly decreased. |
| 45–59 | G3a — mild-to-moderate decrease. |
| 30–44 | G3b — moderate-to-severe decrease. |
| 15–29 | G4 — severely decreased. |
| < 15 | G5 — kidney failure. |